Device and method for detecting services

 

The invention relates to the field of digital communications, in particular, is intended for use in wireless devices to detect the presence of services, multiple access, code-seal (MDCU). In the apparatus provided by the device to detect services that contain at least one detector frequency transmission signal elements, which measures the energy of the autocorrelation of the received total signal of MDCU and delays each dimension of energy at different time delays. The scheme for determining the threshold summarizes the measured energy and establishes the existence of services, if the amount of energy exceeds the threshold, otherwise, set the lack of services. Detectors the transmission frequency of the signal elements may be connected in parallel for simultaneous measurements of the energy of the autocorrelation of the received total signal of MDCU, or one detector frequency transmission signal elements may sequentially change the energy of the autocorrelation of the received total signal of MDCU. The technical result achieved by the invention is in reducing the time of determining the availability of services and the increased sensitivity to unite many atnositsa to the field of digital communication, in particular, to a method and device to detect the presence of services, multiple access, code-seal (MDCU). Although the invention has a wide range of applications, it is particularly suitable for use in wireless devices and will be further described in this aspect.

Description of the prior art For applying MDCU in a cellular communication system or a personal communication system (SPS), the Association of communications industry (TIA) has adopted an Interim standard IS-95-A (IS-95). In the system with MDCU mobile station communicates with one or more of the multiple base stations, distributed in a certain territory. Each base station continuously transmits on the control channel, the control signal having the same extension code, but with different phase shift code. According to the standard IS-95 code expansion is a pseudo-random sequence (PN) bit having a period of 215and under phase shift means a value that is a multiple of 64 elements of the signal, relative to the PN sequence of the control signal with zero offset. The phase shift is used to distinguish the signals of the control channel from each other. PSH bits ("elements") are formed when h is reducerea not in all regions. Therefore, when the mobile station with the ability to work in a mode of MDCU adjusts to the new region or moves it, it must determine whether there was MDCU. One way to determine whether services MDCU is that attempts to capture the signal of a control channel using a comprehensive scan code space control signal for each potential frequency MDCU. The mobile station captures a control channel by capturing phase shift extend-specific code signal of the control channel. If the signal of the control channel can be captured, then the service standard IS-95 is present, otherwise it is possible to judge about its absence.

This way of capturing the signal of the control channel should be used in cases where the service MDCU there at the first test frequency. If the services of MDCU it, the scanning process may take up to 15 seconds on each frequency. This problem is compounded by the fact that services MDCU in each region can be allocated four or more frequency ranges. Therefore, the discovery process of this service may take a full minute or more. In polowat call or notice, that his call could not be implemented in the system with MDCU.

Another way to determine whether services MDCU is that determined by the transmission frequency of the elements of the full signal MDCU adopted by the mobile station, instead of capturing the signal on the control channel. This operation can be performed in parallel with the scan code space of the control signal, so you can quickly determine whether to continue this scan and to abandon it and move to the next frequency, or try looking for other service, such as advanced mobile radio communications (AMPS). Traditional detector with a frequency of transmission elements includes a delay circuit and multiplication, which performs autocorrelation by multiplying the received total signal of MDCU on mating the total received signal, MDCO detained at time T3. In the case of services, MDCO signal and coupled value of the delayed signal will be correlated, i.e., the average output signal of the delay circuit and the multiplication is periodic autocorrelation signal with a period equal to the inverse value of the transmission frequency elements. Conversely, in the case of the with frequency.

To further Refine this definition of traditional detector services MDCU contains a bandpass filter for filtering the output signal of the delay circuit and multiplication. Band-pass filter can be implemented in the form of a programmable digital filter based on the fast Fourier transform (FFT), the bandwidth is set to the frequency of the transmission elements. In addition, the measurement scheme energy measures the energy of the filtered output signal. The measured energy is compared with some poroton and if the measured energy exceeds this threshold, it is possible to judge about the availability of services MDCU.

The disadvantage of the above-described conventional detector services MDCU is in the delay circuit and multiplication. The functioning of this scheme is influenced by many factors such as the shape of the element signal, co-channel interference set of control signals transmitted on the control channel, and many of the traffic signals on the traffic channels, multipath and delay selected for the circuit delay and multiplication.

Some form of signal elements are specifically designed to "hide" signal, i.e. the delay circuit and the multiplication will not be able to provide the miner or the PCA. However, the problem is combining in the receiver interference of several signals of the control channel and multipath components.

Because of the Association with the receiver set of signals of the control channel and multiple signal channels of traffic and their multipath components to obtain a time-varying signal traditional detector with frequency transmission elements may, in one and the same region, where there is a service MDCU, in some places to show that the service MDCU there, but in other places, that it is not. As a result, the user will not have confidence in the correctness of the determination performed by the detector services MDCU.

Therefore, a need exists for a method and device for determining the availability of services MDCU that reduce the time to determine the availability of this service in comparison with the known method with the use of the capture control signal and to reduce the sensitivity to co-channel interference and consolidation of various channels and multipath components at the receiver.

A brief description of the drawings Fig. 1 depicts a structural circuit diagram of a wireless communication system in accordance with the invention.

Fig. 2 - electrical structural 3 depicts the algorithm of the method detection services according to the invention.

Description of the preferred embodiments of the invention the Proposed method and device to detect the presence of services MDCU provide advantages over known devices and methods, which consists in the fact that they allow you to reduce the time for determining the availability of this service and are less sensitive to the Union of the set of channels and multipath components at the receiver.

According to the invention the above advantages essentially provided a device for detecting services that contain at least one detector with a frequency of transmission elements, measuring the energy of the autocorrelation of the full signal MDCU using different delay time for each measurement. In addition, the detection scheme threshold summarizes the measured energy and determines the availability of this service, if the total energy exceeds a certain threshold, otherwise it is determined by the absence of this service. Many measurements of the received total signal of MDCU at different time delays provides a higher probability that at least one of these measurements will not be affected by co-channel interference and multipath, and it is not detctor with a frequency of transmission elements, connected in parallel, provide a measure of the energy of the autocorrelation of the full signal MDCU. In accordance with another aspect of the invention a single detector with a frequency of transmission elements sequentially measures the energy of the autocorrelation of the full signal MDCU.

According to further aspect of the invention, the detector with the frequency of transmission elements includes a delay circuit and multiplication, which takes a sample of the full signal MDCU with a frequency of 2mtimes higher than the transmission frequency items and produces the autocorrelation signal. This bandpass filter has a bandwidth comprising a transmit frequency of elements to filter the autocorrelation signal and to provide a measure of the energy of the autocorrelation of the full signal MDCU.

According to another aspect of the invention, the bandpass filter includes a switch for receiving the autocorrelation of the signal and its sequential supply every 1/2mperiod item 2m-1tracts scheme. Each path circuit includes a multiplier for multiplying the autocorrelation signal switch on a rectangular signal with a binary assessment taking place at the given frequency transmission elements, for receiving asignal. This is the sum of N consecutive samples is a measure of the energy of the autocorrelation of the received total signal of MDCU.

According to the proposed method assume full signal MDCU, perform a variety of measurements of the energy of the autocorrelation of the received total signal of MDCU, and each dimension is obtained using different time delays, summarize the measured energy, determine whether exceeds the total energy threshold and provide an indication of the availability of services, if the total energy exceeds this threshold.

Many measurements of the energy of the autocorrelation of the received total signal of MDCU can be performed simultaneously or sequentially.

The method further includes the steps of multiplying the total signal of MDCU to delayed mating the value of the received total signal of MDCU to obtain the autocorrelation signal and filtering of the signal autocorrelation.

Other advantages and new features of the invention will be described below as an example of a preferred implementation options, and after reading the detailed description of the specialists in this field will be able to understand and implement the invention. Other options are also possible implementation of the invention, the plants may be realized and attained by the means and the totality of symptoms, described in the accompanying claims.

The invention is further described in the example of the first variant of its implementation.

In Fig.1 shows an electrical structural diagram of a wireless communication system 100 that uses a wireless means of communication, such as phone 121, made in accordance with the invention. The drawing shows that, among other things, apparatus 121 used many detectors 109 frequency transmission elements connected in parallel, which is measured when the transmission frequency of the elements of the spectral content of the autocorrelation of the received total signal of MDCU with different time delays.

The antenna 101 receives signals from multiple base stations 123. Each base station 123 transmits a signal on the control channel and multiple signals on the channels of traffic on a dedicated radio frequencies, in particular, in the range of 800-900 MHz for cellular communication or the range of 1800-1900 MHz for the PCA. The signals of the control channel signals and channels of traffic and their multipath components are combined in the receiver, resulting in a full signal MDCU, changing in time. Analog input cascade 103 converts the full signal MDCU with ponijenie-digital Converter (ADC) 105. ADC 105 digitizes the signal and supplies it to the scheme 125 detection services MDCU.

Scheme 125 detection services MDCU contains at least one detector 109 frequency transmission element, which receives the digitized full signal MDCU and measures when the transmission frequency of the elements of its spectral content. This at least one detector 125 frequency transmission elements applies a different delay time for each measurement at a frequency of transmission of the elements of the spectral content of the autocorrelation of the received total signal of MDCU. In the variant shown in Fig.1, at least one detector 109 frequency transmission elements presented three detectors 109 frequency transmission elements connected in parallel, where all the detectors 109 with a transmission frequency of items at the same time take full signal MDCU and simultaneously measured at a frequency of transmission of the elements of its spectral content of autocorrelation.

In another embodiment, this at least one detector 109 with the frequency of the transmission elements is implemented as a single detector 109 frequency transmission elements, which sequentially measures the frequency of transmission of the elements of the spectral content of the autocorrelation of the received full SIO content transmission frequency elements.

In Fig. 2 detector 109 with the transmission frequency of the elements in the circuit 210 delays and multiplication, which takes chetyrehpolnye sample the real and imaginary parts of the digitized full signal MDCU with a frequency of 2mtimes higher than the frequency of the transmission elements. In a preferred embodiment, the number M is chosen equal to 2, therefore, the frequency at which the signal is received, at 4 times the frequency of the transmission elements. This is the minimum sampling frequency for a valid resolution when using the delay time TCmultiple of 1/4 of the period element, namely 1/4, 1/2 and 3/4 of the period item Te. The delay time depends on the sampling frequency. You can select a different sample rate and delay time to reduce the effects of combining signals of the control channel and signal channel traffic and their multipath components at the receiver. For example, the sampling rates at 8 times the frequency of transmission elements, and the delay time that is a multiple of 1/8 of the period of the element Teor sample may be longer than the period of one element, such as 5/4, 6/4, etc. of the period element.

Full signal MDCU is routed through the circuit 203 delay which delays routed the signal through the circuit 205 which is the signal MDCU is multiplied by the full signal MDCU in the multiplier 207 to obtain the autocorrelation signal.

The detector 109 frequency transmission element further comprises a band-pass filter 213, a bandwidth which encompasses the frequency of transmission elements. This filter provides filtering of the autocorrelation signal and measures the frequency of the transmission elements of the spectral content of the autocorrelation of the received total signal of MDCU. Band-pass filter shown in Fig.2 is a simplified hardware implementation of the filter FFT-based and provides quick filtering process. Such a bandpass filter only determines the spectral content of the output signal of the delay circuit and the multiplication in the frequency of transmission elements. Instead you can use other bandpass filters, for example, implemented by means of software.

Is depicted in Fig. 2 band-pass filter 213 contains the actual operator 209 connected to the switch and the delay circuit and multiplication, which takes the autocorrelation signal and determines its real part. In the preferred embodiment, used is the only real part as the imaginary part of the autocorrelation signal contains only a few components of the signal at the given frequency of the transmission elements or does not contain them at all. Com m period element signal on the 2m-2tracts scheme. Each path schema contains the multiplier 215, which multiplies the autocorrelation signal switch 211 in the multiplier 215, a rectangular signal with a binary value, valid when the transmission frequency elements of the signal (with period Teto obtain a multiplied output signal.

For example, if the sampling rate is 4 times higher than the transmission frequency of the signal elements (M=2) switch 211 delivers the autocorrelation of the signal in the upper path circuit within 1/4 period of the element signal and the multiplier 215 multiplies the autocorrelation signal is +1 binary square-wave signal. In the following period of 1/4 of the element signal switch 211 delivers the autocorrelation of the signal in the lower path circuit within 1/4 period of the element signal and the multiplier 215 multiplies this autocorrelation signal value +1 binary square-wave signal. In the following period of 1/4 of the period of the element signal, the switch sends a signal autocorrelation in the upper tract of the scheme in the last 1/4 of the period of the element signal and the multiplier 215 multiplies the autocorrelation signal -1 binary rectangular signaly signal in the lower path circuit within -1/4 period element signal and the multiplier 214 multiplies this autocorrelation signal -1 binary square-wave signal. In fact, the values +1 and -1 are the FFT coefficients to be applied to a dial-up of the autocorrelation signal.

Specialists will be clear that it is possible to use other schemes that differ from those of mixer for use -1 to the autocorrelation of the signal, such as an inverter with gain -1.

Each path diagram of the adder 217 adds N consecutive samples multiplied output signal to obtain a filtered autocorrelation signal. The sum of N consecutive samples is a measure of the spectral content of the autocorrelation of the received total signal of MDCU when the frequency of transmission elements.

Bandwidth bandpass filter is adjusted by choosing the number N, which can be set equal to, for example, 1024, 2048, 4096 or 8192. This bandwidth bandpass filter decreases with decreasing N, and the sensitivity of the detector with the transmission frequency of the elements increases with n

In this particular embodiment, detectors with frequency transmission elements include two measures of the spectral content of the autocorrelation of the received total signal of MDCU when the transmission frequency components, namely, Z1and Z2where Z1is th content at the frequency of transmission elements. The spectral energy of the autocorrelation of the received total signal of MDCU when the transmission frequency of the elements is the sum of the squares of these two parts. The specialist will be clear that the measure of energy can be any one or both of the absolute values of the components of the spectral content at a frequency of transmission elements Z1and Z2or spectral energy at the frequency of transmission elements, as well as others. The term "energy" in this context includes the above-mentioned measures, as well as the maximum, average, etc., measures the spectral content and the spectral energy at the frequency of transmission elements.

On each path circuit also includes a 16-bit register 219 for receiving and storing a value summed N consecutive samples.

As shown in Fig.1, the circuit 125 detection services further comprises circuit 127 defining the threshold, summing the measured energy and determines whether surpasses the total energy of some threshold. If the total energy exceeds this threshold, this indicates the presence of services and on line 117 is supplied corresponding display. Otherwise, no service on the line 119 is supplied corresponding display. The threshold value is chosen t is s N, used in the adder 217.

In the variant shown in Fig.1, the circuit 127 determining the threshold includes Comparators 111 to determine the maximum absolute values of the constituent spectral content at a frequency of transmission elements and the other comparator 113 to determine the maximum of these maxima. And finally, another comparator 115 compares the maximum absolute value of the components of the spectral content at a frequency of transmission elements with a given threshold.

Alternatively, using a single detector with a frequency of transmission elements having an adjustable time delay for sequential measurement scheme 127 detection threshold contains six registers for storing each of the measured values of the constituent spectral content at a frequency of transmission elements and one comparator, which compares the stored values of the six registers with this threshold.

Specialists will know that you can also compare the maximum absolute spectral energy at the frequency of transmission elements, as well as other summative energy with a threshold to determine whether the service MDCU. For example, can be compared with a threshold amount of abstol all six spectral components at the transmission frequency elements.

Hereinafter will be described the use and operation of the device for detecting the services with reference to Fig.3. The method 300 detection services includes receiving a full signal MDCU (step 301), the many dimensions of energy received full signal MDCU (step 303), and each dimension is obtained using different time delays, the summation of the measured energies (step 304), determining whether surpasses the total energy of the threshold (step 305) and an indication of the existence of services, if the total energy exceeds the threshold (step 307), and if the total energy does not exceed the threshold, it receives an indication about the lack of services (step 309).

In one embodiment, the step of obtaining multiple measurements of energy received full signal MDCU (step 303) includes, for each measurement of energy, the multiplication of the full signal MDCU to delayed mating the value of the received total signal of MDCU to obtain the autocorrelation signal and filtering this autocorrelation signal. In addition, the many dimensions of energy received full signal MDCU can be performed simultaneously or sequentially.

For specialists will be apparent various modifications and variations predi invention.

In conclusion, it should be noted that the proposed devices and methods for discovery services provide advantages over known devices and methods that reduce the time to determine the availability of services and increased sensitivity to the Union of the set of channels and multipath components at the receiver. In addition, the detector with the frequency of transmission elements has considerable flexibility, since it has an adjustable TCand bandwidth and sensitivity, adjustable N, and an easier implementation. The above advantages are essentially provided a device for detecting services that contain at least one detector with a frequency of transmission elements, which measures the energy received full signal MDCU with different delay time for each measurement of energy.

Claims

1. The device to detect the presence of services, multiple access, code-seal (MDCU) in the region, characterized in that it contains at least one detector of the transmission frequency elements of the signal intended for reception complete signal MDCU and perform many measurements of energy autocorrelation delay time for each measurement of the energy of the autocorrelation of the received total signal of MDCU, the schema definition of the threshold, is connected, at least one detector of the transmission frequency elements of the signal intended for the summation of the measured energies and determination, not superior if the sum of the energies given threshold, and if the total energy exceeds a certain threshold, it indicates the availability of services, and otherwise no service.

2. The device under item 1, characterized in that at least one detector of the transmission frequency elements of the signal represents at least two detector frequency transmission signal elements connected in parallel and intended for simultaneous reception complete signal MDCU and simultaneous execution of multiple measurements of the energy of the autocorrelation of the received total signal of MDCU with different delay time.

3. The device according to p. 2, characterized in that the full signal MDCU contains many signals on the control channel, each of which has a period element signal and the frequency of transmission of the signal elements, and the frequency of transmission of the signal elements has a spectral composition of the autocorrelation of the received total signal of MDCU with different delay time, the frequency of transmission of the signal elements is frequency driver is separated by a delay circuit and multiplication, designed for taking samples of the full signal MDCU with a frequency of 2mtimes higher than the transmission frequency elements of the signal and multiplying the samples of the full signal MDCU on the associated value of the received total signal of MDCU detained at the appropriate delay time to obtain the autocorrelation signal, and a bandpass filter connected to the delay circuit and multiplying and having a bandwidth including the frequency of transmission of the signal elements, and is designed to filter the autocorrelation signal and perform many measurements of the energy of the autocorrelation of the received total signal of MDCU with different delay time.

4. The device according to p. 3, wherein the bandpass filter includes a switch for receiving the autocorrelation signal and the serial filing of the autocorrelation signal every 1/2mperiod element signal and 2m-1path circuit connected to the switch, each channel circuit includes a multiplier for multiplying the autocorrelation signal switch in the multiplier, on a rectangular signal with a binary value, a current with a frequency of transmission of the signal elements, to obtain a multiplied by vyhodnogo multiplied output signal to obtain a filtered autocorrelation signal, moreover, the sum of N consecutive samples is a measure of the energy of the received total signal of MDCU.

5. The device according to p. 4, wherein M is 2, and one adder provides the real part of the measures of energy, and the other is the imaginary part of the measures of energy.

6. The device under item 4 or 5, characterized in that the bandpass filter further comprises a real operator, designed to determine the real part of the autocorrelation of the signal connected to the switch and the delay circuit and the multiplication and designed to receive the autocorrelation of the signal and determine its real part and consistent supply of the real part of the autocorrelation signal every 1/2mperiod element signal.

7. Device according to any one of paragraphs. 4-6, characterized in that each of the 2m-1tracts circuit further comprises a register connected to the accumulator and intended for receiving and storing the total value of N consecutive samples, and the stored value is a measure of the energy of the autocorrelation of the received total signal of MDCU.

8. The device under item 1, characterized in that at least one detector frequency transmission signal elements represents one detective is the signal MDCU.

9. The device under item 8, characterized in that the full signal MDCU contains many separate signals on the control channel, each of which has a period element signal and the frequency of transmission of the signal elements, with one detector frequency transmission signal elements includes a delay circuit and multiplication for receiving samples of the full signal MDCU with a frequency of 2mtimes higher than the transmission frequency elements of the signal and multiplying the samples of the full signal MDCU on the associated value of the received total signal of MDCU detained at the appropriate delay time to obtain the autocorrelation signal, and a bandpass filter connected to the delay circuit and multiplying and having a bandwidth including the frequency of transmission of the signal elements and is designed to filter the autocorrelation signal and measuring the energy of the autocorrelation of the received total signal of MDCU.

10. Method detection services, characterized in that exercise the full signal MDCU, perform a variety of measurements of the energy of the autocorrelation of the received total signal of MDCU, each measuring energy perform with different delay time sum of the measured energy, compare the sum of the energies with C the result given threshold, it indicates the availability of services.

 

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FIELD: radio communications.

SUBSTANCE: proposed method intended for single-ended radio communications between mobile objects whose routes have common initial center involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile object, these intermediate transceiving drop stations being produced in advance on mentioned mobile objects and destroyed upon completion of radio communications. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning of several radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

1 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer from mobile object to stationary one residing at initial center of common mobile-object route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile object, these intermediate transceiving drop stations being produced in advance on mobile object. Proposed radio communication system is characterized in reduced space requirement which enhanced its effectiveness in joint functioning with several other radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 6 dwg

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile object from stationary one residing at initial center of mobile-object route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile object, these intermediate transceiving drop stations being produced in advance on mobile object. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning with several other radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 6 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method for single-ended radio communications between mobile objects whose routes have common initial center involves use of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile objects. Proposed radio communication system is characterized in reduced space requirement and, consequently, in enhanced effectiveness when operating simultaneously with several other radio communication systems.

EFFECT: reduced mass and size, enhanced noise immunity and electromagnetic safety for attending personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile objects from stationary one residing at initial center of common mobile-objects route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from first mobile object. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in simultaneous functioning of several radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile objects from stationary one residing at initial center of common mobile-objects route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from first mobile object, these intermediate transceiving drop stations being produced in advance on first mobile object. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning with several other radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method for single-ended radio communications between mobile objects having common initial center involves use of low-power intermediate transceiver stations equipped with non-directional antennas and dropped from mobile objects. Proposed radio communication system is characterized in reduced space requirement and, consequently, in enhanced effectiveness when operating simultaneously with several other radio communication systems.

EFFECT: reduced mass and size, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile objects from stationary one residing at initial center of common mobile-objects route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from first mobile object, these intermediate transceiving drop stations being produced in advance on first mobile object and destroyed upon completion of radio communications between mobile and stationary objects. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning with several radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications engineering; digital communications in computer-aided ground-to-air data exchange systems.

SUBSTANCE: proposed system designed to transfer information about all received messages irrespective of their priority from mobile objects to information user has newly introduced message processing unit, group of m modems, (m + 1) and (m + 2) modems, address switching unit, reception disabling unit whose input functions as high-frequency input of station and output is connected to receiver input; control input of reception disabling unit is connected to output of TRANSMIT signal shaping unit; first input/output of message processing unit is connected through series-connected (m + 2) and (m + 1) modems and address switching unit to output of control unit; output of address switching unit is connected to input of transmission signal storage unit; t outputs of message processing unit function through t respective modems as low-frequency outputs of station; initialization of priority setting and control units, message processing unit clock generator, and system loading counter is effected by transferring CLEAR signal to respective inputs.

EFFECT: enhanced efficiency due to enhanced throughput capacity of system.

1 cl, 2 dwg

FIELD: radiophone groups servicing distant subscribers.

SUBSTANCE: proposed radiophone system has base station, plurality of distant subscriber stations, group of modems, each affording direct digital synthesizing of any frequency identifying frequency channel within serial time spaces, and cluster controller incorporating means for synchronizing modems with base station and used to submit any of modems to support communications between subscriber stations and base station during sequential time intervals.

EFFECT: enhanced quality of voice information.

12 cl, 11 dwg

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