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Invention relates to electrical engineering, to a transmitting cascade in a bus assembly of a bus network, mainly in a bus assembly of EIB-network, which is connected to a bus line (Bus+, Bus-), for generation of a bit signal that corresponds to a transmitted signal that has a sequence of transmitted pulses and that consists of an active pulse for each transmitted pulse, which has duration Δt=t1-t0, with that, t0 indicates the beginning of the active pulse, and t1 - at the end of active pulse, and depth Ua of pulse, and an equalising pulse following after the active pulse, with circuit (A) for generation of active pulse, optionally, with circuit (B) for generation of the equalising pulse and at least one control circuit (C) that outputs transmitted signal (Usend) at least to circuit (A) for generation of active pulse. Pulse depth (Ua) of active pulse is set by the specified reference voltage (Uref) that is independent of the value of constant voltage component of a bit signal. |
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Receiver and method for processing radio signals using soft pilot symbols Invention relates to digital radio communication systems. A method of estimating parameters of a radio signal in a radio receiver, received from a transmitter, which denotes defined symbols in the data sequence of said radio signal, using the given alternative modulation for said defined symbols, wherein the method includes the following steps: identifying a plurality of said defined symbols in the data sequence, which are transmitted with higher reliability than the rest of the symbols in the data sequence; demodulating said defined symbols transmitted with higher reliability first in order to generate soft pilot symbols, and using the soft pilot symbols as known symbols in order to estimate parameters of the received radio signal, wherein the soft pilot symbols have modulation of a lower order than modulation of a higher order, used for the rest of the symbols in the data sequence. |
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Improving power efficiency of line driver Invention relates to high-speed transmission of information over a wire line. A double-channel line driver, having a first line driver, a second line driver, a charge pump, and a control logic circuit connected to the first line driver and the second line driver and configured to disable the charge pump when both a first control signal associated with the first line driver and a second control signal associated with the second line driver indicate a charge pump disable state. A network component comprising at least one processor configured to implement the method, comprising receiving a first control signal and a second control signal, disabling a charge pump when both the first control signal and the second control signal indicate a charge pump disable state, and operating the charge pump to boost a voltage when the first control signal, the second control signal, or both indicate a charge pump active state. |
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Method and apparatus for low-complexity interference cancellation in communication signal processing In one aspect, flexible scaling may be understood as attenuating the amount of interference cancellation applied by a receiver, depending on the dynamically changing received signal quality at the receiver. More attenuation is applied at lower signal quality since the hard decisions are less reliable at lower signal qualities, while less (or no) attenuation is applied at higher signal qualities, reflecting the higher reliability of the hard decisions at higher signal qualities. Signal quality may be broken down into ranges, with different values of the flexible scaling factor used for each range. |
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Apparatus and method for transmitting and receiving in multicarrier transmission system Invention discloses a transmitting apparatus (400), having a modulator (410) for modulating each of a plurality of data streams at subcarrier frequencies of the corresponding frequency band in one group from one or more frequency channels; each frequency band occupies not more than a given maximum bandwidth which is less than or equal to the channel bandwidth; a bandwidth information generator (420) for generating bandwidth information which defines frequency bands corresponding to all data streams conveyed by said frequency channel; the bandwidth information includes a tuning frequency indicator which indicates tuning frequency, and a tuning frequency type indicator which indicates the type of tuning frequency indicated by said tuning frequency indicator, where said type is selected from a group comprising at least a first type which indicates bandwidth tuning frequency, and a second type which indicates the centre frequency of the frequency channel, and a transmitter (430) for transmitting said data streams modulated at subcarrier frequencies, and one or more copies of said bandwidth information in corresponding frequency positions in each frequency channel. |
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Methods and apparatus for reducing/suppressing noise in downlink lock-on signals Disclosed is a method, an apparatus and a computer-readable medium for receiving a signal, which includes components consisting of a plurality of cells, channel estimation from a received signal using one or more channel estimation schemes, removing the component signal using the estimated channel from the received signal to generate a processed signal and detecting a residual signal in the processed signal. |
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Communication radio receiver with adaptive compensator Method of estimating a transmitted signal in a wireless communication system involves receiving a wireless signal containing a pilot channel and at least another channel, estimating the transmitted signal using a compensator and the received wireless signal. The compensator includes a filter with a plurality of tap-offs, which can be tuned using an adaptive algorithm which employs the estimated pilot signal from the received wireless signal; the estimated pilot signal is extracted; the estimated pilot signal is delivered to the adaptive algorithm and the plurality of tap-offs are tuned using the adaptive algorithm. The plurality of tap-offs is tuned using the adaptive algorithm in each N-th symbol interval of the pilot signal, where N is a positive integer, wherein the value of N varies based on the speed at which the device moves in the wireless communication system. |
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Transmitter and method of transmitting soft pilot symbols in digital communication system Transmitter transmits a set of soft pilot symbols with higher reliability than the remaining symbols in the sequence by modulating the soft pilot symbols with a lower order modulation such as scaled quadrature phase shift keying (QPSK) or scaled binary phase shift keying (BPSK) while modulating the remaining symbols with a higher order modulation such as 16QAM or 64QAM. The transmitter shares the modulation type and location (time/frequency/code) of the soft pilot symbols with a receiver. Unlike traditional fixed pilots, the soft pilots still carry some data. Additionally, the soft pilots are particularly useful in establishing the amplitude reference essential in demodulating the higher order modulation symbols. In another version, soft pilot symbols are inserted by low-level puncturing of channel encoded bits and replacing the punctured bits with known bit patterns. |
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Spatial interference mitigation for wireless communication Techniques for transmitting and receiving data with spatial interference mitigation in a wireless network are described. In one design of transmitting data with spatial interference mitigation, a first station (e.g., a cell) may receive spatial feedback information (SFI) from a second station (e.g., an interfered UE) that is not communicating with the first station. The second station may also receive precoding information from a third station (e.g., a served UE). The first station may send a data transmission to the third station based on the precoding information and the SFI in order to reduce interference for the second station. In one design, the SFI may include spatial nulling information. The first station may send the data transmission based on the spatial nulling information to steer the data transmission in a direction away from the second station. |
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Method and apparatus for decoder selection in communication system Disclosed are methods of selecting a decoder for decoding forward link (FL) information in a wireless communication network comprising acts of decoding reverse link (RL) information by a plurality of decoders, each being optimised based on a different parameter, and comparing a plurality of output signals from the decoders based on a metric so as to determine a decoder or parameter for reporting to an access terminal. |
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Method and system of preliminary coding and method to build code book of preliminary coding Method of preliminary coding, and also a system and a method of building a code book of preliminary coding include the following: joint storage of information of the code book of preliminary coding by a transmitting end and a receiving end, selection of a code word from a code book of preliminary coding by the receiving end according to the assessed channel matrix and return of a serial number of the code word along a feedback channel to the transmitting end, definition of the code word by the transmitting end according to the serial number and preliminary coding with application of this code word, a unit of symbols sent to the receiving end; besides, at least eight vectors of code words or vectors of columns, at least in eight matrices of code words in the code book of preliminary coding are produced on the basis of 8-dimensional vectors selected from a set of 8-dimensional vectors, and this set of 8-dimensional vectors is produced by calculation from a part of or from all 4-dimensional vectors u1 u2, u3; u4, u5, u6, u7, u8, s, m, n. |
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Assessment of channel with efficient suppression of in-channel interference Pilot signals are received from multiple basic stations or sectors in a time domain, received pilot signals from a time domain are converted into a frequency domain, multiple pilot signals are identified from converted pilot signals, the identified multiple pilot signals are converted from a frequency domain into a time domain. From the converted multiple pilot signals they identify a pilot signal from one of many basic stations or sectors by means of suppression of in-channel interference from many pilot signals from other basic stations or sectors from many basic stations or sectors, and a channel is assessed in a time domain with the help of the identified pilot signal. |
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Using set of filters in adaptive channel repeater using adaptive antenna arrays In an exemplary implementation, the repeater medium comprises a transmitter, a receiver and an adjusted feedback suppression loop circuit comprising a set of filters, wherein the suppression loop is effectively connected to an antenna array. In an exemplary implementation, the feedback suppression loop can receive signals as an input signal from an associated antenna array and provide output signals such as a feedback leakage signal for the associated antenna array. |
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Improved method of encoding and decoding data using at least two pairs of orthogonal sequences In the method encoding data using two pairs of orthogonal sequences, formation of encoding premable using two pairs of additional orthogonal sequences involves transmitting a first sequence corresponding to the first pair using one phase and simultaneously transmitting the first sequence of a second pair using a quadrature phase, transmitting a second sequence corresponding to the first pair using one phase and simultaneously transmitting the second sequence of the second pair using a quadrature phase, transmitting the resultant signal obtained using quadrature modulation to the transmitting medium. |
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Methods and device to reduce noise in systems of wireless communication Basic wireless communication station in a wireless communication system that implements a control upperlink, uses a narrow-band frequency resource inside a broad-band frequency resource. The basic wireless communication station comprises a controller joined as capable of communication with a transceiver, in which the controller is configured, in order to make the transceiver alarm a change in a location for the control upperlink within the broad-band frequency resource. The control upperlink includes at least a pair of control upperlink separated inside the broad-band frequency resource and ensures simultaneous transfers along an upperlink with the help of multiple subscriber terminals communicating in a wireless communication system. |
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Llr nulling, using bit map of demodulator to enhance efficiency of modem decoder Bit map of a demodulation mask includes binary mask values. Each mask value complies with an incoming element of resources for a demodulator. For each mask value of the first condition, a demodulation mechanism in the demodulator is not synchronised, and the demodulator produces a resource element with a zero value. For each mask value of the second condition, the demodulation mechanism is synchronised, the incoming resource element is demodulated, and the demodulator produces a demodulated resource element. The bit map of the demodulation mask is designed to mask resource elements of a reference signal and damaged resource elements. Capacity is preserved, without synchronisation of the demodulation mechanism for damaged elements and resource elements of the reference signal. Subsequent generation of LLR and operations of decoding are simplified. Decoder efficiency improves, since the decoder does not decode LLR values, extracted from damaged resource elements and/or resource elements, which are not relevant for recovery of the transmitted value. |
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Method and system for correction of dc and agc Method to process of a radio-frequency (RF) accepted signal comprises the following stages: application of programmable amplification to a received RF-signal; generation of a signal related to assessment of energy of a received RF-signal; control of programmable amplification on the basis of an energy assessment signal; transformation of a received RF-signal with lower frequency; detection of system time information in a signal transformed with frequency reduction; tuning of a DC component of a signal converted with frequency reduction, with a relatively accurate method; and tuning of a DC-component of a signal transformed with frequency reduction, with a relatively rough method. |
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Receiver adjustment between pilot bursts Method for operating a receiver in a wireless communication system comprises steps of receiving a frame including a plurality of time slots. Each time slot of the plurality of time slots comprising two half-slots, each half-slot comprising two traffic segments and a pilot burst between the two traffic segments. The plurality of time slots comprises a first half-slot and a second half-slot, the first half-slot comprising a first pilot burst and a first traffic segment, the second half-slot comprising a second traffic segment and a second pilot burst. The first and second traffic segments are divided into a plurality of sub-segments, the plurality of sub-segments comprising a first sub-segment and a second sub-segment following the first sub-segment; an equaliser of the receiver is trained on the first pilot burst to obtain a first plurality of trained tap coefficients; the equaliser of the receiver is trained on the second pilot burst to obtain a second plurality of trained tap coefficients, interpolating between the first and the second pluralities of trained tap coefficients to obtain a first set of interpolated tap coefficients for the first sub-segment and equalising the first sub-segment by using the first set of interpolated tap coefficients. |
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Automatic gain control and filtering techniques for use in channel repeater Repeater equipment is provided, which is configured to deploy a feedback cancellation loop which is adaptively connected with an antenna array such that a selected metric can be derived by deploying a selected filter bank having an automatic gain control configured to process the signal based on a resolution element and the derived metric can be applied to the antenna array and feedback cancellation loop combination to improve signal integrity and amplification. In an illustrative implementation, exemplary repeater equipment comprises a transmitter, a receiver, an equalised feedback cancellation loop circuitry comprising a filter bank, the cancellation loop being operatively connected to an antenna array. In the illustrative implementation, the feedback cancellation loop can receive signals as input from a cooperating antenna array and provide output signals such as a feedback leakage signal to a cooperating antenna array. |
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Structure of spatial pilot signal for wireless communication with multiple antennas Pilot signal of the first level for one level transmission is repeated in subbands in the first OFDM character, and the pilot signal of the first level is also repeated with shift from the first OFDM character in the second adjacent OFDM character. Also, additional transmission levels can be transmitted each one of which includes separate pilot signal formed and being repeated in the first character and being repeated with shift from separate pilot signal in the second adjacent character. Then, the first and the second OFDM characters are transmitted and received to characterise receiving channels. |
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Smoothing jitters in network with less delay Method involves putting non-decoded frames extracted from packets in a packet stream into a jitter buffer, while frames from the jitter buffer are decoded and the decoded frames are put into a sample buffer at a rate defined using average playback delay. The average playback delay is a rolling playback delay average calculated for each packet when each packet becomes available. The playback delay for each packet is a sum of the sampling buffer delay and the jitter buffer delay. When each packet is received, the average playback delay is regulated based on comparing playback delay associated with the received packet with the current average playback delay. |
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Reception apparatus, reception method, reception program and system Receiver comprises: a reception means for receiving an OFDM (Orthogonal Frequency Division Multiplexed) signal consisting of signals transmitted in accordance with an OFDM method from a plurality of transmitting devices; a unit for calculating a correction value for correcting the drift value of the OFDM signal using the phase of either a first pilot signal or a second pilot signal, extracted from the obtained OFDM signal; the first pilot signal is obtained from pilot signals which are in phase with each other, coming from a plurality of transmitting devices; the second pilot signal is obtained from pilot signals which are not in phase with each other, coming from a plurality of transmitting devices; and a correction unit or correcting the drift value of the OFDM signal in accordance with the calculated correction value. |
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Method of suppressing transmission leakage signal in a received signal comprises steps for: processing the reception signal in order to generate a signal which must be transmitted; transmitting samples of the signal which must be transmitted to the transmitting device and a delay line; adding the selected time delay to the samples transmitted to the delay line; transmitting samples of the delayed reference transmission signal to a storage device as the selected matrix; forming a correlation matrix R from the stored samples of the delayed reference transmission signal; forming a mutual correlation array p; calculating weight coefficients of tap leads of the corrector using an inverse matrix for matrix R and array p. |
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Mimo transfer with precoding depending on rank Methods are described to do precoding of MIMO transfer depending on rank. Each rank may be connected to a set of at least one precoding vector or precoding matrix, which may ensure good parameters for this rank. A transmitter may get a precoding vector for transfer with a rank-1 from the first set comprising at least one vector-column of a unitary matrix, for instance, a Fourier matrix. The transmitter may do precoding for transfer with the rank-1 on the basis of the precoding vector. The transmitter may receiver a precoding matrix for transfer with a rank-2 from the second set comprising an identity matrix. The transmitter may do precoding for transfer with the rank-2 on the basis of the precoding matrix. For transfer with the rank-2 the transmitter may select the identity matrix as a precoding matrix, if a MIMO channel is similar to a diagonal channel (which may be determined on the basis of antenna configurations), and may select a unitary matrix by another method. |
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Method and apparatus for exchanging codebooks in multiple access wireless communication system Methods and apparatus are disclosed for generating and exchanging codebooks in a multiple access wireless communication system. The codebooks include a plurality of preferred precoding matrices. |
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Pilot signal transmission by relay stations in multihop relay communication system In the method of supporting multihop relay in a wireless communication system, a relay station receives data and a first pilot signal from an upstream station, e.g. a base station or another relay station. The relay station derives a channel estimate based on the first pilot signal and detects data based on the channel estimate. The relay station resends the data and sends a second pilot signal to a downstream station, e.g. a subscriber station or another relay station. Each pilot signal may be sent in accordance with a pilot signal format selected for that pilot signal. The first and second pilot signals may be sent using the same or different pilot signal formats. The relay station may receive channel information from the second station and may send the channel information to the first station and/or select an estimate for data transmission to the second station based on the channel information. |
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Codeword level scrambling for mimo transmission Methods enable scrambling in a codeword level for MIMO transmission. A transmitter station may perform channel encoding for multiple data streams being sent simultaneously for a MIMO transmission. The channel encoding may include forward error correction (FEC) encoding and/or rate matching. The transmitter station may perform scrambling for multiple data streams with different scrambling codes after channel encoding. The transmitter station may also perform channel interleaving, symbol mapping, and spatial processing for multiple data streams after channel encoding. A receiver station may receive the MIMO transmission, perform descrambling for multiple data streams with the different scrambling codes, and then perform channel decoding for multiple data streams. The scrambling may allow the receiver station to isolate each data stream by performing the complementary descrambling and to obtain randomised interference from the remaining data streams. |
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Systems and methods for enhanced channel estimation in wireless communication systems Communication device includes a receiving antenna; a receiver adapted to receive a signal from the receiving antenna; an initial channel estimation module adapted to select a channel among one or more channels in a communication system and for determining for the selected channel the initial channel estimation based on the received signal; a conversion module adapted to convert the initial channel estimation into the initial pulse response estimation containing a series of samples; a filtration module adapted to select a series of samples and generate a truncated initial pulse response estimation by setting into zero samples in the initial pulse response estimation, which are not in the selected series of samples; and a module for estimating channel with maximum likelihood, which is adapted to calculate a weighted pulse response estimation in the time domain using the truncated pulse response estimation in the time domain for the selected channel and for calculating the estimation of the channel with maximum likelihood for the selected channel through conversion into the frequency domain the weighted pulse response estimation in the time domain. |
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Spherical detection and selection of speed for mimo transfer Techniques are described to execute Spherical detection for recovery of data symbols sent in MIMO-transfer by means of spherical detection of data symbols generated with the help of at least two modulation schemes or data symbols in an order determined on the basis of at least one attribute of data symbols, which may be error probabilities, modulation schemes and/or power reserves of a communications line for data symbols. In another aspect, speeds for multiple data flows are selected on the basis of information on a channel condition, on quality of multiple data flow signals. |
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Multi-channel serial viterbi decoder Method is carried out by development of a multi-channel serial Viterbi decoder, comprising the following functional units, interrelated to each other: an input buffer, a generator of a data word reading signal from the input buffer, a decoder of a data word command field, a unit of channel parameter registers, a unit to process a command "path metrics nullification", a unit to process a command "setting a value of the specified path metric", a unit to process a command "reading a bit from a path with the specified number", a unit to process a command "processing of input counts", a main memory of decoding paths and path metrics, a unit to generate a basic address of the main memory area of decoding paths and path metrics for the current decoding channel, a unit to generate an address of the main memory cell of decoding paths and path metrics and a unit of registers of decoding channels output data. |
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Mimo detection with noise suppression in timely signal components Received data is processed on the basis of an input filter, in order to produce filtered data. Then filtered data is processed on the basis of the first matrix of a unitor, in order to produce detected data for the first frame, and the filtered data is processed on the basis of the second matrix of a unitor and decoded data for the first frame, in order to suppress noise caused by the first frame and to produce detected data for the second frame. |
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Transfer of control signal along return communication line by request Control signals are sent by request along a return communication line and are used to assess a channel and data transfer along a forward communication line. The basic station selects at least one terminal to send a control signal by request along the return communication line. Each selected terminal is a candidate to receive data transfer along the forward communication line. The basic station assigns to each selected terminal with the help of time-frequency distribution, which may be for a wideband control signal, a narrowband control signal or some other type of a control signal. The basic station receives and processes transfer of a control signal by request from each selected terminal and extracts assessment of the channel for the terminal on the basis of the received transfer of a control signal. The basic station may plan terminals to transfer data along the forward communication line on the basis of channel assessments for all selected terminals. The basic station may also process data (for instance, carry out generation of a beam or internal control) for transfer into each planned terminal on the basis of its channel assessment. |
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Driver of differential communication line Driver of differential communication line includes the first (1) and the second (2) opposite phase sources of signal, which are connected to bases of the first (3) and the second (4) input transistors (T), the first (5) and the second (6) output T the emitters of which are connected to the appropriate emitters of the first (3) and the second (4) input T and connected to the first (7) power supply (PS) through the appropriate first (8) and second (9) current-stabilising bipoles (CB); the third (10) and the fourth (11) output T the emitters of which are connected to the first (7) PS through the appropriate third (12) and fourth (13) CB, as well as the appropriate bases of the first (5) and the second (6) output T; load circuit (14) connected between emitters of the third (10) and the fourth (11) output T; the first pedestal current source (PCS) (15) the first output of which is connected to base of the third (10) output T and to collectors of the first (5) output T, and the second one is connected to the second (16) PS; the second PCS (17) the first output of which is connected to base of the fourth (11) output T and collector of the second (6) output T, and the second one is connected to the second (16) PS. At that, collectors of the first (3) and the second (4) input T are connected to collector power source. To the circuit there introduced is the first (18) and the second (19) auxiliary T, the first PCS (15) is made on the basis of the first (20) additional T, the collector of which is connected to collector of the first (5) output T and base of the third (10) output T; emitter is connected through the first (21) auxiliary resistor to the second (16) PS, and base is connected to offset voltage source (22); the second PCS (17) is made on the basis of the second additional T (23) the collector of which is connected to collector of the second (6) output T and base of the fourth (11) output T; emitter is connected through the second (24) auxiliary resistor to the second (16) PS, and base is connected to offset voltage source (22). At that, base of the first (18) auxiliary T is connected to emitter of the second (23) additional T; emitter of the first (18) auxiliary T is connected to collector of the third (10) output T; collectors of the first (18) and the second (19) auxiliary T are connected to the second (16) PS; base of the second (19) auxiliary T is connected to emitter of the first (20) additional T, and emitter of the second (19) auxiliary T is connected to collector of the fourth (11) output T. |
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Assessment of orthogonal frequency division multiplex channels Receiver to receive an orthogonal frequency division multiplex (OFDM) signal of digital video broadcasting (DVB), including sets of OFDM-symbols, containing data symbols and pilot symbols, comprises an input module, arranged with the possibility to receive the OFDM DVB-signal along a transmission channel and a channel assessment module connected to the input module and arranged with the possibility to calculate estimates of the transmission channel by means of Fourier transformation of OFDM-symbols sets to produce multiple transformed sets of frequency area, and by detection of at least one set of minimum mean-square error (MMSE) filtration coefficients for at least one of transformed symbol sets, using subset of pilot symbols in one transformed symbols set. |
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Communication channel evaluation Channel evaluation apparatus for determining channel evaluation parametres indicative of a wireless communication channel is configured based on a received signal, which contains the known transmitted signal and a noise signal. The channel evaluation apparatus is configured to apply to the received signal a frequency-domain presentation of the inverse of the combination of the known signal coefficient as a function of frequency and a noise coefficient. |
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System, method, device and computer program for wireless communication Transmitter sends user data after a reference signal. On the other side, receiver receives a channel matrix on the basis of a reference signal attached before user data, receives user data, weighing this data using receiving scales extracted from channel matrix, performs adaptive assessment of H channel matrix when receiving user data, and transfer weights V' are produced to transfer user data in reverse direction from adaptive assessment of H' channel matrix. |
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Interface and method of bus loop supply Interface (100) of bus loop supply comprises a module (110) of voltage adjustment, receiving loop voltage VLOOP and generating specified supply voltage VSUPPLY, module (120) for impedance adjustment connected to module (110) of voltage adjustment, besides module (120) of impedance adjustment receives loop current ILOOP and generates specified supply current ISUPPLY, and feedback (115), connected between module (110) of voltage adjustment and module (120) of impedance adjustment. Feedback (115) provides for feedback signal of voltage adjustment module (110), which makes it possible for voltage adjustment module (110) to substantially maintain specified supply voltage VSUPPLY. |
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In method of protection against errors in process of data element transfer along communication system, data element is coded according to specified rule of coding, data words are generated as consisting of bits (DWA, DWB), and one of these generated data words (DWA, DWB) is selected with account of current digital sum formed according to appropriate data word (DWA, DWB), and current digital sum of selected data word (DW) is used to generate the first current digital sum. Selected data word (DW) by means of modulation is transformed into code data cord (CDW), besides a two-bit sequence is assigned to each bit of data word (DW) with two various values of separate bits. Code data word (CDW) and the first current digital sum are transmitted to subscriber-receiver. Received code data word (CDW) is inspected for availability of two-bit sequence in it with two identical values of separate bits, thus two-bit sequence with error is detected, and error is corrected by means of the first current digital sum. |
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Start-stop communication system Start-stop communicaton system comprises the following components on transmitting side - source of information (1), unit of signal generation (2), the first mixer (10), the first generator of intermediate frequency (12), transmitter (11), communication line (52), the first frequency synthesiser (13), unit of signal generation includes shift register (3), coding device (4), multiplexor (5), phase manipulator (6), the first clock pulse generator (7), generator of pseudorandom sequence (PRSG) (8), key (9), on receiving side: receiver (14), the second mixer (15), controlled amplifier (16), phase changer (21), two multipliers (17), (19), two low-pass filters (18), (20), the second generator of intermediate frequency (50), the second frequency synthesiser (51), voltage controlled generator (49), unit of signal processing (22), which includes the following components: the third multiplier (30), two non-linear elements (23), (29), the third low pass filter (25), summator (24), logarithmic cascade (26), amplifier (27), integrating link (28), interrupter (31), accumulator (32), two threshold units (33), (43), two differentiating cascades (34), (44), two pulse generators (35), (45), inverter (42), circuit AND (39), two OR circuits (36), (40), circuit AND-NOT (47), solving device (38), RS-trigger (46), the second clock pulse generator (37) and decording device (41). |
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Start-stop communication system Start-stop communicaton system comprises the following components on transmitting side - source of information (1), unit of signals generation (2), which includes shift register (3), coding device (4), conversion device (5), multiplexor (6), phase manipulator (7), the first clock pulse generator (8), generator of pseudorandom sequence (9) and key (10), also the first mixer (11), the first frequency synthesiser (14), generator of intermediate frequency (13), transmitter (12), communication line (50), on receiving side - receiver (15), the second mixer (16), controlled amplifier (17), two low-pass filters (LPF) (19), (21), two multipliers (18), (20), phase changer (22), the second generator of intermediate frequency (IFG) (47), the second frequency synthesiser (48), the third clock pulse generator (CPG) (49); unit of signal processing (23), which includes two analog-digital converters (ADC) (24), (31), four non-linear elements (NE) (25), (32), (34), (40), three summators (26),(35),(43), the third LPF (27), logarithmic cascade (28), integrating link (29), digital-analog converter (DAC) (30), two video stores (33), (39), two multipliers (42), (46), synchronising unit (36), the second clock pulse generator (37), solving device (44), decoding device (38), two delay lines (41), (45). |
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Methods and device for selection of decoder in communication systems Methods are disclosed for selection of decoder used to decode information of forward communication line (FL) in wireless communication network, including actions of reverse communication line (RL) information decoding by multiple decoders, every of which is optimised on the basis of differing parametres, and comparison of multiple output signals of decoders on the basis of metrics, in order to determine decoder or parametre for communication to access terminal. |
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Iterative frequency correction using taught sequence and data bits Invention relates to a receiver and a reception method, particularly to a method of receiving a signal which contains information which depends on frequency or a characteristic associated with frequency. Transmitted signals contain standard information known to the receiver. The receiver includes apparatus for evaluating the said standard information and non-standard information to form evaluated information, where the said non-standard information immediately precedes the said standard information and/or immediately follows after it, and apparatus which uses the evaluated information to determine errors in the said received signals and compensates for the said error. |
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Modulation scheme for data transmission medium Characters corresponding to combinations may be determined from a set of characters containing at least sixteen characters. Selection of a pulse, for instance may be done based on the character value and a sequence of similar pulses may be transmitted at a rate of at least 10 Gb per second over a data transmission medium having a twisted copper cable, for example. The received signal can be demodulated based on empirically defined reliability values. |
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Selecting parametre for setting channel estimation threshold Invention relates to communication networks and is meant for estimating a communication channel. In the method a first channel impulse response estimate (CIRE) having multiple channel taps is derived, for example by filtering initial CIREs obtained from received pilot-characters. A threshold parametre value is selected based on at least one criterion, which may relate to channel profile, operating SNR, number of channel taps, and so on. A second CIRE is derived by zeroing out selected ones of the channel taps in the first CIRE based on the threshold parametre value. The average energy of the channel taps may be determined, a threshold may be derived based on the average energy and the threshold parametre value, and channel taps with energy less than the threshold may be zeroed out. Memory may store threshold parametre values for different operating scenarios, and stored values may be selected for use based on the current operating scenario. |
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Method and device for transmitting information in system using different transmission protocols Invention relates to communication engineering. A method and device for channel assessment in a system which uses broadcast/group (multicast) and unicast protocols are proposed. The number of pilot signals used for broadcasting is greater than the number of pilot signals used for unicast. Channel assessment can be considerably worsened if a character of the broadcasting time interval is adjoined to a character of the unicast time interval such that, pilot signals of adjacent time intervals are used for channel assessment. It is therefore determined whether the first time interval of one transmission protocol (broadcasting time interval) is adjacent to the second time interval of another transmission protocol (unicast time interval), and if the first character of the unicast time interval. The power of the pilot signal and/or number of pilot-subcarriers increases for the peripheral character of the broadcasting time interval for channel assessment using the peripheral character. |
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Limited switching of channels in wireless communication systems Frequency band is separated into at least two adjacent sub-bands. Definition is made of whether it is desirable to transfer in single sub-band or more than in one sub-band. Transfer is assigned so that it either takes place in single sub-band, or in more than one sub-band. If transfer is limited with one sub-band, template of channels switching is also limited with subcarriers in specific sub-band. |
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Method and device for remote coding of superimpositions when using short codes in synchronisation Method and device for evaluating transfer function h(t) if communication channel contains steps of creating the data di sequence having the built cdi part associated with at least two codes w0, w1, in which correlation function Acode of the built cdi part with one of the two codes w0, wi is characterised with maximum value at k=0 and less than maximum value at k≠0; creating cj sequence of signal elements, which has Tc period of signal elements, as data sequence expanded with the enlarging sequence Si which is N long; creating com (t) = co(t + mNTc) at m=0, 1, …, M by means of correlation of the received signal r(t) with the enlarging sequence Si, where received signal r(t) contains sequence cj of signal elements, which has been used for communication channel; and creating evaluation of transfer function of communication channel, as combinations com(t) and dm at m=0, 1, …, M. |
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Current mode coupler for high-speed communication outside microcircuit chips Invention is related to data transfer from microcircuit chip to microcircuit chip, which uses method of current mode instead of generally accepted methods of differential transfer of voltage mode signals. Current pulse is introduced into one of two transfer wires based on signal value subject to transfer (for instance, logical "0" or "1") by driver in transmitting microcircuit chip. Current pulse is accepted as differential current signal in receiving unit in receiving microcircuit chip. Differential current signal is transformed by current comparators into differential signal of low span voltage. Differential voltage signal may be detected by receiver of operational amplifier, which produces according value of signal. |
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Channel evaluation for multipath cdma signal in receiver Invention relates to methods and systems for improving channel evaluation in a wireless communication system. The method involves reception of a wireless signal, which contains several multipath components, and obtaining N channel evaluations, where N is any positive integer greater than one. Each channel evaluation is associated with its own multipath component. Obtaining N channel evaluations involves filtering the received wireless signal using a matched filter, which is matched with the pulse characteristic of the filter of the transmitter baseband; N delays are evaluated; the output signal of the matched filter is descrambled using pseudorandom noise, through which N descrambled signals are obtained; each of the N descrambled signals is correlated with a reference signal to obtain N channel evaluations; a multipath correlation matrix is calculated; a noise covariance matrix is calculated; the said matrices are used to reduce interference effects between several multipath components in N channel evaluations; interference effects between multipath components are reduced based on N channel evaluations. |
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Communication radio receiver with adaptive equaliser Present invention relates to an adaptive equaliser, used in a wireless communication system. According to the method, a wireless signal is received, which comprises a pilot-channel and at least some other channel. The received signal is assessed using an equaliser. The equaliser comprises a filter with large number of tap leads, which are tuned using an adaptive algorithm. The adaptive algorithm uses the assessed pilot signal, assessed from the received wireless signal. |
Another patent 2528409.