Synchronization to the base station and receiving a code in the communication system with signal transmission in a wide range

 

The invention relates to electrical engineering and can be used in the communication system with signal transmission in a wide range, in particular to the actions of search honeycomb performed by the mobile station, and to receive specific honeycomb long code used in the communication system in a wide range. The technical result - improving the accuracy of synchronization and increase transmission speed. Each frame transmission in a communication system with signal transmission in a wide range related to the transmission of the synchronization code, is divided into many segments. Each of the segments includes primary (pilot) codeand secondary (combined) codethat includes information identifying or pointing as the frame synchronization and encryption code for synchronization. This information related to synchronization of the frame and the encryption code can be encoded in the combined codeand in terms of the modulation sequences of many of the combined code in the frame. Alternatively, this information is encoded in the sequence of many of the combined codepassed the as yet another alternative, information is encoded in the timing of transmission of the combined codein each segment of the frame relative to its associated primary code. 2 C. and 38 C.p. f-crystals, 7 Il.

Cross-reference to related application This patent application relates to patent application U.S. serial number 08/884002, entitled "Synchronization of the mobile station in the communication system with signal transmission in a wide range of" registered on July 27, 1997 (34645-278USPT).

The previous state of the art Technical field of the invention the Present invention relates to communication systems for signal transmission in a wide range and, in particular, to the actions of search honeycomb performed by the mobile station to acquire the timing of the base station and to receive specific honeycomb long code used in the communication system in a wide range.

Description of related technology industry of cell phones has achieved phenomenal success in commercial transactions around the world. Growth in the major Metropolitan areas far exceeded expectations and ahead of the capacity of the system. If this trend continues, the effects of rapid growth soon Ska base expands, while the width of the electromagnetic spectrum provided by the cellular service providers for use in providing radio frequency communications, remains limited. Need for new solutions to meet these growing capacity requirements in the limited available spectrum and to maintain a high quality of service and to avoid price increases.

Currently, access to the channel in the first place is achieved using Multiple access frequency division multiple access (FDMA) and Multiple access with time division multiplexing (TDMA). In systems multiple access frequency division multiplexing physical channel contains one radio frequency band, which concentrates the transmit power of the signal. In systems multiple access with time division multiplexing physical channel contains the time interval in a periodic sequence of time intervals on the same radio frequency. Although communication systems FDMA and TDMA are obtained satisfactory characteristics, often there is an overload of the channel due to the increasing demands of the subscribers. Accordingly, now available, rassmatrivaemikh communication which is commercially available for use as a new method of channel access in wireless communication. Systems with a wide range was used from the time of the second world war. Early applications were mainly focused on military objectives (related to the creation of a strong radio and radar). Currently, however, there is increasing interest in the use of systems in a wide range of applications, including digital cellular radio, land mobile communications and internal/external network personal communications.

System of signal transmission in a wide range of acts not as a conventional communication systems FDMA and TDMA. In the transmitter wide spectrum multiple access code division multiple access direct sequence (DS-CDMA), for example, a stream of digital symbols for this dedicated or shared channel on the main symbol rate is extended to the transfer rate of basic assumptions. This expansion operation includes the use of a unique channel code extensions (sometimes called a sequence signatures) to the stream of characters, which increases its speed (bandwidth) by adding redundancy. Usually during the expansion of the stream of digital symbols umnozhitelnyh parcels), then added to other processed similarly (i.e., advanced) intermediate signals relating to other channels. Unique encryption code of the base station (often called "long code", as it is in most cases longer than the extension code is then applied to the summed intermediate signals to generate an output signal for multi-channel transmission in the communication environment. Intermediate signals related to the selection/common channel, then advantageously share the same transmission frequency communication, with many signals, found themselves placed on top of each other in the frequency domain and in the time interval. However, since the applied extension code are unique to the channel, each intermediate signal on a shared frequency communication, is also unique and by applying certain processing in the receiver may be separated from other signals.

In the mobile station DS-CDMA transmission signal in a wide range (receiver) received signals are recovered by applying (i.e., multiplication or approval) of the relevant codes of encoding and extensions to compress the signal or Udaka there where the extension code applied to other transmitted and received intermediate signals obtained only noise. The shrink operation is thus effectively contains the process of correlation, comparing the received signal with a corresponding digital code to recover from a channel of the desired information.

Before will happen any radio communication or transmission of information between the base station and the mobile station communication system with signal transmission in a wide range, the mobile station must detect this base station and synchronized with the reference synchronization signal that the base station. This process is commonly called in the art "search site". In the communication system, multiple access code division multiple access direct sequence with signal transmission in a wide range, for example, the mobile station must find the boundaries of the elementary parcels direct channel, boundary symbols and boundaries of these frames of reference clock pulses. The most common solution used to this timing issue is the periodic transmission of the base station (with a repetition period of Tp) and the detection and processing of the mobile station of the detected pilot code

In broad-spectrum receiver of the mobile station received signals demodulated and serves to filter, agreed with the pilot code (code). Of course, it is clear that for processing the pilot code can be used an alternative scheme for detection, such as a sliding correlation. Issuance of peaks matched filter every time corresponds to the reception periodically transmitted pilot code. Due to the effect of distribution on many paths, several peaks can be detected with respect to one transmission of the pilot code. From processing these received peaks known method can be found in the reference synchronization signal related to the transmitting base station, NY the synchronization signal can be used to synchronize communication of the mobile station and the base station relative to the synchronization frame.

Because there may be selected any length of Npbasic assumptions for the transmitted pilot codein practical terms, the length of the Npin elementary parcels is limited by the complexity of the matched filter used in the receiver of the mobile station. At the same time, it is desirable to limit the instantaneous peak powersignal transmission of the pilot code channel, so as not to create a high instantaneous interference from other transmitted signals/channels wide spectrum. To get sufficient average power of transmission of the pilot code given length elementary parcel Npmay become necessary in the CDMA communication system to use the repetition period of the pilot code Tpthat is shorter than the length of the frame Tfas shown in Fig.2.

Another reason to transfer multiple pilot codeswithin the length of one frame Tfis maintaining midwestone direct synchronization channel in a compressed mode, known to experienced professionals. When processing compressed mode, the synchronization of the downlink channel at a given carrier frequency is performed only during part of the frame, and Nerima can lose detection of the pilot code at a considerable interval of time. By passing a set of pilot codespduring each frame is given a lot of opportunities for each frame, the detection processing of the compressed mode, and can be detected, at least one transmission of the pilot code.

However, there is a lack relating to reception and synchronization, feel when you transfer many pilot codeswithin one frame length Tf. The received signals are also demodulated and serves to filter or correlator), consistent with the known pilot code. The output peaks of the matched filter every time corresponds to the reception periodically transmitted pilot code. From processing these peaks reference synchronization signal for the transmitting base station related to the repetition period of the pilot code Tpmay be determined by a method well known in the art. However, this reference signal synchronization ambiguous with respect to synchronization of the frame and, thus, does not provide sufficient information for synchronization of the frame base/mobile station with the reference synchronization signal. Under ambiguity, meaning that the frame boundary (i.e., synchronization) may not be identifiziert the th receive long code, specific to honeycomb used for direct channel to encrypt communications direct dedicated and shared channel. Dedicated channels contain as traffic channels and control channels and common channels also contain traffic channels and control channels (which may include a broadcast channel control (SSN)). Group code long codepreferably transmitted synchronously with the pilot code (and optionally orthogonal to pilot codes)as shown in Fig.3. This group code long code is sent with a known modulation and without any encryption of the long code. Each group code long codeto view a specific subset of the total set of long codes, which belongs to specific honeycomb long code used for transmission. For example, there may be only a hundred and twenty-eight long codes are grouped into four subsets according to the thirty-two codes each. By identifying the transmitted code group long codesthe receiver can narrow the search to get its long code in this example, only thirty-two long codes contained in polyboranes frame can be found from the joint processing of received pilot codesand group codes long codes. The mobile station first identifies the sync pilot code by applying-matched filter to the signal and identify the peaks. Of these peaks can be found in the reference synchronization signal relative to the segments. Although they are ambiguous with respect to synchronization frame, the specific locations of the segments identify synchronization for simultaneous transmission group code long code. Then performed correlation in known locations of the segments to obtain the identification code group long codes. From this identification number specific to honeycomb long codes used for transmission is reduced. Finally, is the correlation with respect to each of the reduced number of long codes (i.e., those long codes that are contained in the identifieda subset of) each of the known intervals, to determine which specific honeycomb long code is used for transmission, and to provide the reference phase shift. When the phase iswithin the length of one frame Tfthe definition of the synchronization frame alternative helps the method described in the patent application U.S. serial number 08/884002, entitled "Synchronization of the mobile station in the communication system with signal transmission in a wide range", registered on June 27, 1997, by the fact that each of the segments includes not only the pilot codeas shown in Fig.2, described above, but also the synchronization code framepassed with a known modulation, but without a long encryption code, as shown in Fig.4. The pilot code is the same in each segment and repeating frames. Synchronization codes frames, however, are unique for each segment in the frame and are repeated in each frame.

To obtain timing information frame, the mobile station first identifies the sync pilot code by applying-matched filter to the signal and identify the peaks. Of these peaks may be determined by reference synchronization signal relative to the segments. Although this reference synchronization signal mixed to the synchronization frame, the knowledge of the location of the segment on the right segment. The mobile station then further correlates a set of known codes synchronization framesto navigate to the received signal at the locations of code synchronization frames. Considering that the position of each code synchronization framesrelative to the border of the frame is known, when the coincidence correlation found in this position, the frame boundary with respect to it (and hence the synchronization frame) is then also known.

Although previous methods for information sync provides satisfactory results, their performance leaves much to be desired. For example, processing a group code long codedoes not provide a direct indication of the synchronization frame, thus requiring additional correlations in each identified location of the segment to determine the synchronization frame. On the contrary, although the processing code synchronization framesprovides an indication of the synchronization frame, the completion of the search process honeycomb additionally requires additional correlations to determine specific honeycomb long code, the escarpment processing, sophisticated in design and slow down the process of finding a honeycomb. Therefore, there is a need for a more effective way to obtain as indicating the synchronization frame, and display long code during the process of searching for honeycomb.

Brief description of the invention, Each frame transmission to the base station in the communication system with signal transmission in a wide range related to the transmission of the synchronization code, is divided into many segments. Each of the segments includes the codethe primary synchronization code andsecondary synchronization (hereinafter referred to as the combined code), including the framing, and information encryption or display long code (idk li). In the first embodiment of this invention, the synchronization information frame and code encryption is encoded in the combined codeand in the modulated values of the sequences of plural combined codes in the frame. In the second embodiment of the present invention, the synchronization information frame and code encryption is encoded in the sequence of plural combined codestransmitted in each frame, atelinae encoding the combined code (as in the first embodiment) can be used to provide additional timing information frame and code encryption. Finally, in the third embodiment of the present invention, the synchronization information frame and code encryption is encoded in the timing of transmission of the combined codein each segment of the frame relative to its associated pilot code. Additional coding of the combined code and the sequence of modulation (as in the first embodiment) can be used to provide additional timing information frame and code encryption.

A brief description of the drawings a More complete understanding of the method and apparatus of the present invention can be obtained by reference to the subsequent detailed description, taken in conjunction with accompanying drawings, in which: Fig. 1, previously described, is a diagram illustrating the format of a transmission signal of the pilot channel of the previous techniques in the communication system, multiple access code division multiple access direct sequence (DS-CDMA); Fig.2, previously described, is a diagram illustrating an alternate format transmission signal of the pilot channel predshestvuyuschee; Fig.3, previously described, is a diagram illustrating an alternate format transmission signal of the pilot channel and group long code channel of the previous techniques in the communication system, multiple access code division multiple access direct sequence;
Fig.4, previously described, is a diagram illustrating another alternative format pilot transmission code and code synchronization frames preceding equipment in the communication system, multiple access code division multiple access direct sequence;
Fig. 5 is a chart illustrating the transmission format of the combined pilot code and the combined code of the present invention in the communication system, multiple access code division multiple access direct sequence;
Fig. 6A-6F illustrate a variety of embodiments of the present invention to enable information as a synchronization frame and a long code in the compound code and
Fig.7 is a block diagram of a communication system with signal transmission in a wide spectrum multiple access code division multiple access direct sequence (DS-CDMA).

Detailed description of drawings
The reference to Fig. 5, where the giving of the signal in a wide range (such as the communication system multiple access code division multiple access direct sequence). Each frame having a duration of Tfthe transmission signal is divided into many segments s0, s1,..., sM-1. The duration of each segment s is equal to the repetition period of the pilot code Tp. Each of the segments includes a pilot code(primary synchronization code) and the combined codeindicating the synchronization frame and a long code (lci) (hereinafter called the combined code or secondary code synchronization). The pilot code is the same in each segment and all duplicate frames, and it is transmitted with a known modulation and without encryption of the long code. Pilot codeand the combined codepreferably transmitted simultaneously and overlap. Combined codes may, for example, be the same in each segmentor different in each segment. Many of the combined codepassed by one for each corresponding segment s0, s1,..., sM-1and are repeated in each frame. The combined code in this way is transmitted without any ltitle orthogonal pilot code. Pilot codehas a predetermined offset time t1regarding the border 30 of its respective segment. Each combined codehas a time offset t2relative to the boundaries of the segment 30. The offset time t1preferably is set equal to the time offset2(i.e., simultaneous transmission of the pilot codeand the combined codeto benefit simplify the processing relating to the detection phase, as will be described later.

Combined codeincludes information identifying or pointing as a synchronization frame and a long code. This advantageously eliminates the need to send separate group code long code on the direct channel (see Fig. 3). Moreover, it is more effective processing of the combined code to be detected as a synchronization frame and a long code used in the encryption of the transmission on the forward channel.

There are several possible technologies to enable information as a synchronization frame and a long code combination is like different versions, as discussed below, in General, encode timing information frame and a long code in the combined codeand in the values of the modulation sequences of the combined code. Other technology containing the second embodiment of the present invention (including specific performance, discussed below), in General, encode timing information frame and a long code in the sequence set of the combined codetransmitted in each frame, as well as in the modulated values of the sequences of many of the combined code. Additional coding of the combined code (as in the technology of the first embodiment) can be used to provide additional timing information of the frame and/or long code. Other technology containing the third embodiment of the present invention (including a few different versions, discussed below), in General, encode timing information of the frame and/or long code synchronization of the transmission of the combined coderegarding the pilot code. For the coding itself is alzavano, to provide additional timing information of the frame and/or long code.

Referring now specifically to the first embodiment of the present invention, there is Ns/lcipossible valid combination codes. These Ns/lcipossible combination codes can provide log2(Ns/lcibits of information for use in the transfer of information to long code containing code or long code (which identifies a subset of the possible long codes used in the encryption of the transmission of the direct channel), or even the current long code. This means that by searching for receiver one particular of the really transmitteds/lcicombined codes will be received log2(Ns/lci), bits of information showing the long code. For example, when two hundred fifty-six long codes are grouped into four groups of sixty-four of the code in each, Ns/lci=4, and thus there are four possible combined code. When the receiver determines that the combined codethat is transmitted is, for example, number three, then he also learns C, accepted log2(4)= 2 bits of useful information. Combined codesthis frame is additionally modulated with one of the Nmodpossible valid (for example, binary or quadrature) modulation sequences. Each valid sequence modulation necessarily provide the timing information of the frame. Nmodvalid sequences of modulation enable log2(Nmodbits of information for use in the transfer of (additional) information long code (if Nmod>1). In this embodiment it is preferable that the sequence of modulation had a good autocorrelation properties. Moreover, if Nmod>1, is desirable also good cross-correlation properties, and it is also desirable that any cyclic shift of any valid sequence of modulation could not give another valid sequence of modulation (or any cyclic shift).

In accordance with one method of the present invention for recovery of the transmitted information by applying-matched filter mobile D/img_data/63/637561.gif">. This correlation provides additional reference value of the phase of the channel, useful for coherent detection values of the modulation of the combined codein the segments. The receiver may then (e.g., in parallel) to map the received combined codes with each of the Ns/lcipossible combination codes. This can be done on a single frame, thereby collecting Ns/lcisequences of the M values of the correlation. These Ns/lcisequences of the M values of correlation (containing Ns/lcirows and M columns of the first matrix - Z1) then correlate (or agreed) with M possible shifts all Nmodpossible sequences of modulation (containing MNmodcolumns and M rows of the second matrix M1). This correlation can be mathematically represented by a multiplication of the first matrix (Z1) in the second matrix (M1). This process should be taken into account the compensation phase channel. The assessment phase of the channel is obtained from the correlations of the pilot code (as mentioned above). Correlation (M1Z1), which gives the best agreement (i.e., highest value) indicates the combined code, which was used (takaki way providing more information long code (if Nmod>1)) and its shift that was used (thus providing timing information frame).

In the first version (related to the first embodiment of the present invention) shown in figure 6A, data bits of each of the combined codein the frame are the same in each segment, and they transmit the information of the long code containing code or long code (which identifies a subset of the possible long codes used in the encryption of the transmission of the direct channel), or a valid long code. Then a predefined sequence modulation is applied to the set included the combined codein the frame to determine timing information frame.

Modulation selected to determine the synchronization information frame can be either coherent or differential. For coherent modulation reference value of the phase is retrieved by the mobile station (receiver) from the associated pilot codebecause it is usually modulated by a known value of the character (for example, "+1"). In this case, the distance between the pilot codein successive segments. In this case, must be achieved acceptable accurate frequency synchronization to the synchronization time to detect a sequence of modulation by the mobile station.

A more complete understanding of this first performance may be obtained with reference to some examples. In the first example, providing a two-position phase shift keying (BPSK), the combined codeprovides information long code. This information may contain either the long code or group code long code that indicates the subset of long codes, which were selected long code that is specific to honeycomb. The sequence of binary values of modulation (such is ormatio synchronization frame. Thus, in this example, the first combined codefor the first segment in the frame is modulated +1, the second combined codefor the second segment in the frame is modulated -1 and so on

In the second example, providing a quadrature-phase shift keying (QPSK), the combined codeagain provides information long code. This information may contain either the long code or group code long code indicating the subset of long codes, which were chosen for specific honeycomb long code. First quarter M-1 of the combined codethis frame is modulated phase is "0" (i.e., multiplied by "+1"), the next quarter of a code is modulated by the phase values are "/2" (i.e., multiplied by "+j"), third quarter of the codes is modulated by the phase values are "" (i.e., multiplied by "-1") and the last quarter of the codes is modulated by the value of the phase 3/2" (i.e., multiplied by "-j").

The second version (related to the first embodiment of the present invention) shown in Fig.6B, the combined codesin the frame, and the values of the sequence of modulation (e.g., +1, -1, -1, +1,...,+1, -1, -1) determine how information long code (containing code or group of codes that identifies a subset of the possible long codes used in the encryption of the transmission of the direct channel, or even the actual long code), and timing information frame (uniquely identifying the associated segment). Here also, the modulation selected for determining the synchronization information frame and information of the long code can be either coherent or differential.

A more complete understanding of this second performance can be obtained by reference to certain examples. In the first example, the first portion of the sequence of modulation for the combined codesclearly defines the information of the long code and the second portion of the sequence of modulation is used to determine timing information of the frame. You should carefully choose the templates for the first and second parts of the sequence of modulation, in order to ensure an unambiguous detection. Thus, certain valid templates for information synchronization adronov for information long code, contained in the first part of the sequence of modulation (and/or Vice versa, as appropriate).

In the second example, the sequence of modulation for the combined codes10 clearly defines the long code information and implicitly defines the synchronization frames. For this version there is only a limited (e.g., M-1 in the dip phase manipulation) the number of valid sequences of modulation for the frame. The values of these sequences determine the modulation information of the long code containing code or long code, which identifies a subset of the possible long codes used in the encryption of the transmission of the direct channel, or a valid long code. Moreover, since there is only a limited number of sequences, modulation, finding any of these limited number of sequences modulation frame implicitly gives timing information of the frame (because the first element of each sequence of modulation known and may be associated with a corresponding first segment).

In the third version (related to the first embodiment of the present invention, shown T (to a limited extent) the long code information. A predefined sequence of modulation is then applied to the set of combined codesin the frame, and the values of the sequence of modulation (e.g., +1, -1, -1, +1, . . . , +1, -1, -1) complete explicit definition of information long code (containing code or group of codes that identifies a subset of the possible long codes used in the encryption of the transmission of the direct channel, or even the actual long code) and implicitly determine timing information frame (uniquely identifying the associated segment). Thus, the long code information is distributed as the most combined codeand the sequence of modulation sets the combined codein the frame. Here also, the modulation selected for determining the synchronization information frame and information of the long code can be either coherent or differential.

Returning now specifically to the second embodiment of the present invention, note that there are Ns/lci-seqpossible valid sequences" combined codefor new codes can provide log2(Ns/lci-seqbits of information for use in the transfer of information to long code containing code or group of codes (which identifies a subset of the possible long codes used in the encryption of the transmission of the direct channel), or even the actual long code. In this embodiment it is preferable that a valid sequence of combined codes were unique and each had good properties of autocorrelation and cross-correlation. In General practice it is believed that one sequence of the combined code is all that is required. When a valid sequence of combined codes is found, the synchronization information frame precisely defined. As an extension, in cases where the sequence (order) of the combined code does not provide sufficient information long code (for example, if Ns/lci-seq=1), combined codesin this frame can be additionally modulated one of the Nmodpossible valid (for example, binary or quadrature) modulation sequences. Nmodvalid sequences of modulation enable log2(the second for special identification of the long code, specific to honeycomb). In this embodiment it is preferable that the sequence of modulation had a good autocorrelation properties, good cross-correlation properties, and that any cyclic shift of any valid modulating sequence could not give another valid modulating sequence (or any cyclic shift).

In accordance with one method of the present invention for recovery of the transmitted information by applying-matched filter mobile station (receiver) determines the place of each of the segments, and hence the location of the combined code. This correlation provides additional reference value of the phase of the channel, useful for coherent detection modulation values in the combined codein the segments. The receiver may then (e.g., in parallel) to map the received combined codes with each of the M possible shifts of the Ns/lci-seqpossible sequences of the combined code. This can be done on a single frame, thereby collectings/lci-seqM placentas the values of correlation (containing Ns/lci-seqM rows and M columns of the first matrix - Z2) then correlate (or agreed) with all Nmodpossible modulating sequences (containingmodcolumns and M rows of the second matrix M2). This correlation can be mathematically represented by a multiplication of the first matrix (Z2) in the second matrix (M2). This process should be taken into account the compensation phase channel. The assessment phase of the channel is obtained from the correlations of the pilot code (as mentioned above). Correlation (Z2M2), which gives the best agreement (i.e., highest value), specifies the sequence of the combined code (if Ns/lci-seq>1), which was used (thus providing information long code), which shift was used (thus providing timing information frame), and optionally specifies the sequence of modulation that was used (thus providing information long code).

Considering now a specific example of this execution is shown in Fig. 6D, the sequence of sets of combined codesin the frame determines (to some selected degree) information DL). A predefined sequence of modulation can also be applied to the sequence of the combined codein the frame, and the values of the sequence of modulation (e.g., +1, -1, -1, +1, . . . ,+1, -1, -1) complete explicit definition of information long code (containing code or group of codes that identifies a subset of the possible long codes used in the encryption of the transmission of the direct channel, or even the actual long code). Thus, the long code information can be distributed as a sequence of combined codesin the frame, and the sequence of modulation of the combined codein the frame. Here also, the modulation selected for determining the synchronization information frame and information of the long code can be either coherent or differential.

Returning now specifically to the third embodiment of the present invention, note that there are Ns/lcipossible valid combination codes. These Ns/lcicombined codes can provide log2(Ns/lcibit informed> this frame is additionally placed with one of several possible time shifts relative to the corresponding pilot code. In General, then the sequence of the combined code form one of the Nt2-modpossible valid sequences of intervals, determining time shifts t2between each combined codeand its associated pilot codefor segments in each frame. Nt2-modvalid sequences of modulation provide log2(Nt2-modbits of information for use in the transmission of synchronization information frame and/or information long code.

In accordance with one method of the present invention for recovery of the transmitted information by applying-matched filter mobile station (receiver) determines the position of each segment and hence the approximate position of the combined code. This correlation further provides a reference synchronization used in the measurement of displacements in time for the combined codesin the segments. When the action is indefined, this sequence of intervals then provides bits are used for information synchronization frame and information of the long code.

In the first version (related to the third embodiment of the present invention) shown in Fig.6E, bits of information each of the combined codein the frame the same in each segment, and they contain any of the selected predefined and known information. A predefined sequence of intervals is then applied to the set included the combined codein frame with the sequence of intervals (for example, d0d1d2,...,dM-1) defining a separate offset for time t2between each combined codeand associated pilot code, further defining how information long code (containing code or long code, which identifies a subset of the long code used to encrypt the transmission of the direct channel, or a valid long code), and timing information frame (to be achieved by reference to the example. The first part of the sequence of intervals for the combined codesclearly defines the information of the long code and the second portion of the sequence of intervals is used to determine timing information of the frame. You should carefully consider the choice of templates for the first and second parts of the sequence of intervals to ensure an unambiguous detection. Thus, certain valid templates for information synchronization frame included in the second part of the sequence of distances, should be excluded from the valid templates for information long codes included in the first part of the sequence of distances (and/or Vice versa, as appropriate).

The second version (related to the third embodiment of the present invention) shown in Fig.6F, bits of information each of the combined codein the frame the same in each segment and contain any predefined and known information. A predefined sequence of intervals is then applied to the set included the combined codein the frame with znachenie time shift t2between each combined codeand associated pilot code, further defining how information long code (containing code or long code, which identifies a subset of the long code used to encrypt the transmission of the direct channel, or a valid long code), and timing information frame (uniquely identifying the associated segment). A predefined sequence of modulation is then applied to the set included the combined codein frame with the sequence of modulation (e.g., +1, -1, -1, +1,...,+1, -1, -1), defining (as opposed to the one defined by the sequence of intervals), or timing information frame, or long code.

A more complete understanding of this second performance can be achieved by reference to some examples. In the first example, the sequence of modulation for the combined codesspecifies timing information frame, and the sequence of intervals for temporal shifts t2specifies information �ta/63/637615.gif">specifies information long code, and a sequence of intervals for displacements at time t2specifies timing information frame.

The reference to Fig.7, which shows a block diagram of a communication system with signal transmission in a wide range of 113 multiple access code division multiple access direct sequence (DS-CDMA). The base station 112 to the communication system 113 includes a transmitter downlink channel 110. The transmitter 110 transmits multiple channels on a straight line and includes a block of channel equipment 100 for information-bearing channels, including dedicated channels 114 (including traffic channels and control channels), and the channels 116 (also including the traffic channels and control channels). For each of the selected channels 114 on line 118 is received stream of digital symbols at the base of the symbol rate. This received data stream of digital symbols is then expanded up to speed transmission elementary parcels for issuance as intermediate signal of the selected channel on the line 120. This expansion operation includes the use of unique individual code channel extension Cw,d(often called the sequence "Signia selected (d) channel can be used, for example, the type code of Walsh (w). Use the unique code of the extension channel is usually accomplished by the use of physical expansion unit 122, such as multiplication or addition modulo two.

A similar process is performed for each of the common channels 116 (including the General broadcast channel control (SSN)). The stream of digital symbols with a base speed of transmission symbols for the shared channel is received on line 124. This received data stream of digital symbols is then expanded up to speed transmission elementary parcels for issuance as intermediate signal common channel on the line 126. This expansion operation includes the use of unique individual code channel extension Cw,cto navigate to the received stream of digital symbols, which increases its transmission rate. For a unique code to extend the General (C) channel can be used, for example, the type code of Walsh (w). Use the unique code of the extension channel is usually accomplished by use of the expansion unit 128.

Each of the channels 114 or 116 may include a power control unit 148, which handles many of the generated intermediate signals dedicated and shared channels, taken on the lines 120 , with the adjusted power then added together by the adder 150, to generate a combined signal on line 152. This combined signal is then encrypted using a unique code encryption base station C1(called "long code") to generate an output signal on line 154 for multi-channel transmission through the communication environment. For long code can be used any suitable code encryption. The use of the long code is usually accomplished by the use of a physical encoding device 156, such as multiplication or addition modulo two.

The transmitter 110 further includes a block channel equipment 102 for transmission related to the seizure (i.e., the search honeycomb) channels 116', such as the channels to use when capturing a base station the mobile station (for example, a pilot codesand group codes long codes Withg), which take no short type codes Walsh Cwto expand or long codes C1for encoding, used channels 114 or shared channels 116. These codes are used for capture operations in the receiver and in General together are referred to in the preceding technique of "masked characters long code", because they are passed to the remote long code Cto navigate to the received stream of digital symbols, which increases its transmission rate. For the pilot channel can be used, for example, orthogonal gold code. The pilot application code is usually executed by using the expansion unit 136.

Further, for example, a similar process is performed for the combined code 116(g)' one of these channels 116' (containing the secondary channel synchronization). The symbol is taken on the line 138. This may a known symbol is then expanded up to speed transmission elementary parcels for issuance as intermediate signal of the combined code on line 140. This expansion operation includes the application of the combined codeto well-known character that increases its transmission rate. For the combined code can be used, for example, orthogonal gold code. The combined code is usually accomplished by use of the device is ativam many generated intermediate signals, taken on the lines 132 and 140, to enable individual control of the transmission power of each channel. Intermediate signals with the adjusted power for channels 116' then selectively summed together with the encoded combined output signal, taken on the line 154, the adder 158 to generate the output signal of the transmitter downlink channel on line 160 for transmission. The process of power control may, if necessary, to be performed in conjunction with capacity management, running on dedicated channels 114 and common channels 116 in order to maintain essentially constant output power from the transmitter 110 as various intermediate signals of the channels 116' are added to complete the output signal of the transmitter and removed from it on the line 160. Dedicated/shared channels 114 and 116 and related to the capture channel 116' of the output signal is then advantageously share the same transmission frequency of communication in the communication environment (the air interface) 162 to the mobile station 164, with many signals are placed on top of each other in the frequency domain and in the time interval.

Selective addition of each intermediate channel signal 116' (such as promezhutochn in the receiver, to the encoded output signal for the dedicated/shared channels is controlled using a variety of hardware and/or software switches 164. For each intermediate signal is provided with one switch 164, the set of switches is selected independently or together. In accordance with the selection operation performed by the switches 164, when the switch is in the first physical/logical position (as shown by the arrow of a solid line 144) corresponding to the intermediate signal goes to the power control unit 148 and the adder 158. On the contrary, when the switch is in the second physical/logical position (as shown by the arrow of broken line 146) corresponding to the intermediate signal does not pass. The intermediate signals of the channel 116' (for example, for the pilot code and the combined code) is periodically transmitted. In each case the transmission of the switch 164 selects the first position (shown by the arrow 144) and the corresponding intermediate signal channels 116' is added to the selected channels 114 and common channels 116 and transmitted to them.

The mobile station 164 receives the forward channel signals transmitted through anizatio frame and long code information. This information is then used to synchronize the mobile station 164 with the base station 112 communication system 113. Being synchronized, the mobile station 164 may then receive and recover the information transmitted by the dedicated and common channels. In General, the processes performed by the mobile station 164, called compression, because operations perform correlation destruction of expanding sequence of the received transmission. The output signals obtained from these correlations, are served to the detectors, which restore the original information data stream. The shape of the detector used depends on the characteristics of the radio channel and limitations of complexity. It may include channel estimation and coherent RAKE combining, or differential detection and merging, as needed.


Claims

1. The transfer method synchronization code direct communication channel with multiple access code division of channels containing the steps: transmitting a repeating frame that contains many segments, and the codeinitial synchronization is repeated in each of the multiple segments repeating what if">secondary synchronization providing information applicable to identify as a synchronization frame and an encryption code for transmission over the direct communication channel.

2. The method according to p. 1, in which the information relating to the encryption code is transmitted by the combined codesecondary synchronization.

3. The method according to p. 1, in which the information related to the synchronization frame is transmitted values of the modulation selected in accordance with a predefined sequence of modulation, for the combined codessecondary synchronization in the frame.

4. The method according to p. 3, in which the modulation is performed a predetermined sequence modulation on the combined codesecondary synchronization frame contains a two-position phase shift keying (SK).

5. The method according to p. 3, in which the modulation is performed a predetermined sequence modulation on the combined codesecondary synchronization frame contains quadrature phase shift keying (QPSK).

6. The method according to p. 1, in which the information relating to synchronize the particular sequence modulation, for the combined codessecondary synchronization in the frame.

7. The method according to p. 6, in which the sequence of modulation contains the first part and the second part, and the modulation pattern defined by the first part of a sequence of modulation, provides information related to the synchronization of the frame, and the modulation pattern defined by the second part of the sequence of modulation, provides information related to the encryption code.

8. The method according to p. 6, in which the modulation pattern defined by a sequence of modulation, explicitly provides information related to the encryption code, and implicitly provides information related to the synchronization of the frame.

9. The method according to p. 1, in which part of the information related to the encryption code is transmitted by the combined codesecondary synchronization.

10. The method according to p. 9, in which information related to the synchronization of the frame, and information related to the encryption code is transmitted values of the modulation selected in accordance with a predetermined sequence modulation, for the combined codessecondary synchronization in the frame which supports the second piece of information, related to the encryption code, and implicitly provides information related to the synchronization of the frame.

12. The method according to p. 1, in which at least part of the information related to the encryption code is transmitted by a sequence of combined codessecondary synchronization included in the frame, and the sequence additionally implicitly provides information related to the synchronization of the frame.

13. The method according to p. 12, in which additional information related to the encryption code is transmitted values of the modulation selected in accordance with a predetermined sequence modulation, for the combined codessecondary synchronization in the frame.

14. The method according to p. 13, in which the modulation pattern defined by a sequence of modulation, clearly provides the second part of the information related to the encryption code.

15. The method according to p. 1, in which each combined codesecondary synchronization offset from its associated codethe primary synchronization segment on the interval defined by the pattern of intervals in the sequence interval identification, at least one of the synchronization frame and encryption code.

16. The method according to p. 15, in which the sequence of intervals contains the first part and the second part, and the pattern of the intervals defined by the first part of a sequence of intervals, provides information related to the synchronization of the frame, and the pattern of the intervals defined by the second part of a sequence of intervals, provides information related to the encryption code.

17. The method according to p. 15, in which the pattern of the intervals defined by the sequence of intervals, provides information suitable to identify the synchronization frame, and information related to the encryption code is transmitted values of the modulation selected in accordance with a predetermined sequence modulation, for the combined codessecondary synchronization in the frame.

18. The method according to p. 15, in which the pattern of the intervals defined by the sequence of intervals, provides information suitable to identify the encryption code, and the information related to the synchronization frame is transmitted values of the modulation selected in accordance with a predetermined sequence mojob by p. 1, in which the codethe primary synchronization contains the pilot code.

20. The method according to p. 1, in which the cryptographic code contains a long code.

21. Communication system multiple access code division of channels containing the transmitter of the base station to generate the transmission signal with the code synchronization of the direct channel, and the transmission signals with the code synchronization of the direct channel contains a repeating frame that contains multiple segments, the codethe primary synchronization repeated in each segment of the repeating frame and the combined codesecondary synchronization providing information suitable for identification as a synchronization frame and an encryption code for transmitting the direct channel and the mobile station to receive transmission signals with the code synchronization of the direct channel and data recovery, suitable for identification as a synchronization frame and an encryption code.

22. System on p. 21, in which information related to the encryption code is transmitted by the combined code.

23. System on p. 21, in which the information from the Noah sequence modulation, for the combined codesin the frame.

24. System p. 23, in which the modulation is performed by a sequence of modulation on the combined codein the frame that contains the dip phase shift keying (SK).

25. System p. 23, in which the modulation is performed by a sequence of modulation on the combined codethe frame includes a quadrature phase shift keying (QPSK).

26. System on p. 21, in which information related to the synchronization of the frame, and information related to the encryption code is transmitted values of the modulation selected in accordance with a predetermined sequence modulation, for the combined codesin the frame.

27. System p. 26, in which the sequence of modulation contains the first part and the second part, and in which the modulation pattern defined by the first part of a sequence of modulation, provides information related to the synchronization of the frame, and the modulation pattern defined by the second part of the sequence of modulation, provides information related to the encryption code.

28. System p. 26, which is provalnogo code and implicitly provides information related to the synchronization of the frame.

29. System on p. 21, in which a piece of information related to the encryption code is transmitted by the combined code.

30. System on p. 29, in which information related to the synchronization of the frame, and information related to the encryption code is transmitted values of the modulation selected in accordance with a predetermined sequence modulation, for the combined codesin the frame.

31. The system 30 p. in which the modulation pattern defined by a sequence of modulation, clearly provides the second part of the information related to the encryption code, and implicitly provides information related to the synchronization of the frame.

32. System on p. 21, in which at least part of the information related to the encryption code is transmitted by a sequence of combined codesincluded in the frame , and the sequence additionally implicitly provides information related to the synchronization of the frame.

33. System p. 32, in which additional information related to the encryption code is transmitted velaavani codesin the frame.

34. System p. 33, in which the modulation pattern defined by a sequence of modulation, clearly provides the second part of the information related to the encryption code.

35. System on p. 21, in which each combined codeoffset from its associated codethe primary synchronization segment on the interval defined by the pattern of intervals in the sequence of intervals, and in which the pattern of the intervals defined by the sequence of intervals, provides information suitable for identifying at least one of the synchronization frame and encryption code.

36. System p. 35, in which the sequence of intervals contains the first part and the second part, and in which the pattern of the intervals defined by the first part of a sequence of intervals, provides information related to the synchronization of the frame, and the pattern of the intervals defined by the second part of a sequence of intervals, provides information related to the encryption code.

37. System p. 35, in which the pattern of the intervals defined by the sequence of intervals, provides information suitable for identificazione in accordance with a predetermined sequence modulation, for the combined codesin the frame.

38. System p. 35, in which the pattern of the intervals defined by the sequence of intervals, provides information suitable to identify the encryption code, and the information related to the synchronization frame is transmitted values of the modulation selected in accordance with a predetermined sequence modulation, for the combined codesin the frame.

39. System on p. 21, in which the codethe primary synchronization contains the pilot code.

40. System on p. 21, in which the cryptographic code contains a long code.

 

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