# Method for noiseless coding of speech signals in digital radio communication system

FIELD: radio engineering, communication.

SUBSTANCE: method for noiseless conversion of speech signals in a digital radio communication system through modification thereof into a digital form via delta modulation is characterised by determining the digital value e_{i} of the next i-th speech reading using the difference between the input signal reading x_{i} and the approximation of said reading y_{i}, expressed by a given relationship, and subsequent redundant coding of the digital information with noise-immune cyclic or convolution code, wherein to improve noise-immunity of the digital signal, a convolution code sequence is used, pairs of readings x_{i,1} and x_{i,2} are coded simultaneously, which enables to maintain communication link data rate, which is equal to the analogue-to-digital conversion rate of the speech signal.

EFFECT: preventing increase of the data rate of a digital radio link.

3 dwg

**Same patents:**

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to a wireless communication system comprising a base station and terminal using a generated codebook. The device and method of generating a codebook in a wireless communication system with multiple antenna arrays use said codebook for communication. The method comprises steps of: providing a basic codebook which contains multiple pre-coding matrices; and assigning phase offsets to certain pre-coding matrices in the basic codebook to form a codebook with phase offset. The feedback overhead from a client to a base station side is reduced and a good accuracy of feedback for a multielement antenna array is maintained.

EFFECT: high accuracy of feedback for a multielement antenna array.

20 cl, 1 tbl, 13 dwg

FIELD: physics, communications.

SUBSTANCE: invention relates to video encoding techniques. Disclosed is a method of encoding input data to generate corresponding encoded output data. The method includes a step of dividing said input data into a plurality of blocks or packets, the size of which depends on the nature of the content thereof, wherein said blocks or packets have one or more sizes. Said input data are divided into a plurality of blocks or packets such that at least one of the representative parameters thereof, which describe content of said blocks or packets, are constant within the divided blocks or packets. Further, the method includes applying a plurality of transformations to the content of said blocks or packets to generate corresponding transformed data, and checking the quality of presentation of said transformed data of blocks or packets compared to the content of said blocks or packets before applying said transformations to determine if the quality of presentation of said transformed data satisfies one or more quality criteria.

EFFECT: providing lossless data compression.

23 cl, 6 dwg, 5 tbl

FIELD: radio engineering, communication.

SUBSTANCE: multichannel transmitter for a spectrally efficient radio communication system comprises N information channels, K call channels and J service channels, wherein N+K+J=L is the total number of channels of the transmitter, as well as a clock generator, a carrier frequency generator, a channel signal adder, a nonlinear masking sequence generator, a nonlinear orthogonal code generator and a frequency divider. The circuit of each channel of the transmitter includes a channel signal spectrum former, which comprises first and second M-ary amplitude-phase modulators, first and second multipliers, first and second low-pass filters, first and second phase modulators, first and second band-pass filters and an adder.

EFFECT: high spectral efficiency of transmitting information in communication systems.

2 cl, 2 dwg

FIELD: physics, communications.

SUBSTANCE: invention relates to data encoding and transmission and can be used in automated space rocket preparation and launching systems. The method comprises steps where all transmitted messages are protected from distortions by cyclic coding and the same noise-immunity is provided for all transmitted messages; wherein vital messages, distortion of which can lead to dangerous consequences, are transmitted in two consecutive cyclic code combinations, wherein the information part of the first code combination contains an odd number of units, and the information part of the second code combination is an inverse of the information part of the first code combination.

EFFECT: high reliability of transmitting messages over communication channels.

FIELD: information technology.

SUBSTANCE: encoding method for performing low-density parity-check convolutional coding (LDPC-CC) with a time-varying period q using a parity check polynomial with a coding rate of (n-1)/n (where n is an integer equal to or greater than 2), the time-varying period of q being a prime number greater than 3, the method includes receiving an information sequence as input and encoding the information sequence using an equation as a g-th (g=0, 1,…, q-1) parity check polynomial to satisfy 0:

EFFECT: high error correction capacity.

15 cl, 75 dwg, 9 tbl

FIELD: radio engineering, communication.

SUBSTANCE: method of decoding convolutional codes involves receiving radio signals, automatic gain control, demodulation, first deinterleaving, Viterbi algorithm decoding, amplitude detection, averaging, second deinterleaving, nonlinear conversion and multichannel multiplication-summation.

EFFECT: low error probability when decoding and high noise-immunity of transmitted information.

7 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to a coding method in a wireless mobile communication system. More specifically, the present invention relates to a convolutional turbo coding (CTC) method and a device for implementing the method. The method for CTC includes steps of encoding information bits A and B using a constituent encoder, and outputting parity sequences Y_{1} and W_{1}, interleaving the information bits A and B using a CTC interleaver to obtain information bits C and D, and encoding the interleaved information bits C and D using the constituent encoder to obtain parity sequences Y_{2} and W_{2}, interleaving the information bits A and B, the parity sequences Y_{1} and W_{1} and the parity sequences Y_{2} and W_{2}, respectively, wherein the bits in at least one of a bit group consisting of the information bits A and B, a bit group consisting of the sequences Y_{1 }and W_{1}, and a bit group consisting of the sequences Y_{2} and W_{2} are alternately mapped to bits of constellation points with high reliability and low reliability and puncturing the interleaving result to obtain the encoded bit sequences.

EFFECT: high reliability of encoding with bit mapping of high order modulation.

12 cl, 7 dwg

FIELD: radio engineering, communication.

SUBSTANCE: information 1 consisting of five pulses is encoded in form of a series of one positive pulse, two positive pulses, each magnified N times, one negative pulse magnified N times and one positive pulse, and an information 0 consisting of five pulses is encoded in form of a series of one negative pulse, two negative pulses, each magnified N times, one positive pulse magnified N times and one negative pulse, wherein N is a positive number greater than 1; the obtained sequences are transmitted to a data transmitting medium, and the received signal is compared with a reference signal by cross-correlation at the receiving side.

EFFECT: obtaining a clear signal with high level of interference and longer range of signal transmission.

2 cl, 5 dwg

FIELD: information technology.

SUBSTANCE: input signal is converted to spectral coefficients; the spectral coefficients are grouped into frequency bands and standards are estimated for each band as the average energy in the band; the spectrum is normalised based on the estimated standards; the standards are weighted based on psycho-acoustic properties of sound; bit distribution is calculated based on the weighted standards; the spectrum is quantised and encoded by the obtained number of bits; the method is characterised by that bit distribution is calculated based on a psycho-acoustic model built on quantised standards. Also disclosed is a device for implementing this method.

EFFECT: low level of distortions and easier encoding.

26 cl, 15 dwg

FIELD: radio engineering, communication.

SUBSTANCE: method of transmitting information bits includes a step of dividing the information bits to be transmitted into at least two groups. Further, according to the method, the information bits in each group to be transmitted are encoded to obtain at least two groups of encoded bits. Said at least two groups of encoded bits are combined to obtain a full sequence of encoded bits. The full sequence of encoded bits is obtained by dividing the encoded bits in each group into N subgroups and reordering said subgroups in each group of encoded bits. Subgroups in at least one group of the encoded bits are discontinuously distributed in the full sequence of encoded bits after reordering.

EFFECT: improved reception quality.

16 cl, 9 dwg, 2 tbl

FIELD: radio engineering, communications.

SUBSTANCE: device comprises a correction device, a circuit of bit quality identification, a demodulator, a circuit of symbol quality detection and selection of least valid symbols, a circuit of code cycle synchronisation with integrated soft and hard decisions, a circuit of error vectors generation for least valid symbols, a unit of summators by module two, a unit of decoders of a BCH code, a circuit for detection of least weight, a controller of PC code decoder.

EFFECT: increased validity of information reception in channels with high level of noise.

1 dwg

FIELD: information technology.

SUBSTANCE: disclosed is a signal transmitting device comprising: a forward error correction (FEC) encoder which performs FEC coding of input data according to a Bose-Chaudhuri-Hocquenghem (BCH) coding scheme and a low-density parity check (LDPC) coding scheme; a first interleaver which interleaves FEC coded data; a symbol display unit which converts the interleaved data into data symbols; a second interleaver which interleaves data symbols; an encoder which codes data symbols interleaved by the second interleaver according to a multiple-input single-output (MISO) coding technique; a unit for inserting a pilot symbol into data frames which contains coded data symbols. At least the pilot symbol includes information for the type of transmission according to the MISO coding technique; and a transmitter for transmitting the data frame which includes the pilot symbol and data symbols.

EFFECT: high efficiency o using channel bandwidth, high rate of transmitting data and longer signal transmission distance.

15 cl, 35 dwg

FIELD: information technologies.

SUBSTANCE: invention is related to data transfer technology and may be used in systems with decision feedback for reception of information coded by cyclic code that permits majority decoding procedure. Decoder with detection and correction of errors comprises two OR elements, shift register, nine keys, syndrome calculator, summators, majority element, summator by module two, counter of corrections, shift counter, unit of discrete integration, counter of invalid symbols and buffer shift register. The novelty in decoder is introduction of discrete integration unit, counter of invalid symbols, the second OR element, two keys (eighth and ninth) and buffer shift register, and also change of connections between available elements of decoder. All that helped to increase noise immunity and accuracy of decoding of received discrete signals due to application of majority decoding principles.

EFFECT: improved noise immunity and accuracy of decoding.

1 dwg

FIELD: physics, communication.

SUBSTANCE: invention is related to the field of communication and may be used in devices for transmission of discrete information in communication line with interferences. Device contains memorising register, unit of error detection, unit of error correction, switching unit, which consists of two "AND" circuits, two registers of generator polynomial, two summators by module two, two decoders, programmable logical matrix, comparison unit, processor, inverter. Also method is disclosed for correction of two errors in cyclic code, which is realised by this device.

EFFECT: increase of communication channels equipment interference protection.

2 cl, 2 dwg, 1 tbl

FIELD: communications engineering, possible use in data transmission systems, for remote measurement, remote control, in radio-transmitting equipment of small spacecrafts and for deep space telemetry.

SUBSTANCE: in accordance to the invention, at transmitting side code words are generated by encoding information symbols using cyclic code without usage of synchronizing patterns, parameters of cyclic code are changed depending on level of interference, transferred information is accumulated at receiving side, thus creating a selection, then for phasing by code words limits of code word are determined, supposed length of code word is set, and in set window "sliding" symbol-wise discrete Fourier transformation is performed in Galois field for whole volume of selection being analyzed, while at each step of "sliding" discrete Fourier transformation in Galois field, selection of zero spectral components is performed as well as determining of quantity thereof together with building a function of number of zero spectral components at each step of "sliding" discrete Fourier transformation in Galois field, then decimation of given function is performed with step, equal to supposed length of code word, with building of a function estimate of mathematical expectation of number of zero spectral components, phasing moments reach maximum of mathematical expectation estimation function of number of zero spectral components, with consideration of resulting maximum, code words are selected, and then estimate of mathematical expectation of code word spectrums is performed and parameters of cyclic code are evaluated on basis of resulting code words, and then cyclotomic classes are determined, the generative polynomial of cyclic code is restored and code words are decoded.

EFFECT: increased interference resistance of cyclic code receipt, automatic adaptation of characteristics of transferred signal to interference intensity, increased speed of information transfer and accelerated phasing process during transfer of code words without synchronizing patterns.

4 dwg

FIELD: communications engineering, in particular, engineering of data transfer systems for decoding cyclic interference-resistant codes without preliminary phasing.

SUBSTANCE: during decoding of cyclic interference-resistant code, range of presumed lengths of code combinations [n_{min}-n_{max}] is determined, and assumed phase of beginning of code combination f is set, from phase f in received code series several presumed code combinations S_{i} are selected and pairs are formed from selected combinations in accordance to condition S_{i}≠S_{k}, N of greatest common divisors, represented by polynomials, is calculated, and from calculated polynomials a polynomial of least order is selected, which is considered equal to original polynomial g(x) of cyclic interference-resistant code, if N of greatest common divisors is equal to "1", then length of proposed code combination n is increased by one, phase of proposed beginning of code combination is altered for one, if greatest common divisor, different from "1", is not found for all n∈[n_{min}-n_{max}], combinations of errors are determined in code word and selected code combinations are decoded.

EFFECT: development of method for decoding cyclic interference-resistant code under conditions of adaptation of interference-resistant code to quality of information transfer channel.

3 cl

FIELD: communications engineering; data transfer, telemetering, and telecontrol systems.

SUBSTANCE: proposed codec has on sending end code-word data part shaper whose output and that of code-word synchronizing part shaper are connected to modulo two adder input; on receiving end it has binary filter whose code-word data part shaper output is connected to accumulator connected to synchronizing sequence decoder and to error connection unit whose outputs are connected to respective inverting inputs of code-word data part shaper; output of the latter functions as data output of device; output of binary-filter code-word synchronizing part is connected through switching unit to input of code-word data part shaping unit; synchronizing sequence decoder output is connected to control input of switching unit and to error correction unit input; on receiving end accumulator outputs are connected to inputs of code-word data part shift decoder whose output is connected to input of delay circuit whose output functions as second control input of switching unit and as synchronizing output of device.

EFFECT: enhanced noise immunity.

1 cl, 1 dwg

FIELD: communications engineering; network remote measuring and control systems.

SUBSTANCE: proposed noise-immune cyclic code codec designed for data transfer without pre-phasing has on sending end code-word information section shaper incorporating shift-register memory elements, units for computing verifying parts of noise-immune code of code-word information section, and modulo two adder of code-word information section shaper; code-word synchronizing section shaper and modulo two adder of code-word synchronizing section; on receiving end it has binary filter incorporating binary-filter shift register memory elements, computing units for verifying parts of binary-filter noise-immune code, and binary-filter modulo two adder; shift register of code word information section; decoder; accumulator; error correction unit; unit for shaping synchronizing section of code word; and modulo two adder units.

EFFECT: enhanced speed of device.

1 cl, 1 dwg

FIELD: communications engineering; network remote measuring and control systems.

SUBSTANCE: proposed noise-immune cyclic code codec designed for data transfer without pre-phasing has on sending end code-word information section shaper incorporating shift-register memory elements, units for computing verifying parts of noise-immune code of code-word information section, and modulo two adder of code-word information section shaper; code-word synchronizing section shaper and modulo two adder of code-word synchronizing section; on receiving end it has binary filter incorporating binary-filter shift register memory elements, computing units for verifying parts of binary-filter noise-immune code, and binary-filter modulo two adder; shift register of code word information section; decoder; accumulator; error correction unit; unit for shaping synchronizing section of code word; and modulo two adder units.

EFFECT: enhanced speed of device.

1 cl, 1 dwg