RU2617122C1 - Method of the information transmission in the digital communication system with noise-like signals - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: claimed method of the encoding principle provides the operation determination of one from the alternative pseudo-random sequences group (PRS), by the choice of which at the transmitting side of the communication system there has been encoded the receiving symbol, the formation taking into account the specific PRS of the character bits group.

EFFECT: improving information transmission noise immunity, while simultaneous transmission several telegraph elements in one and the same frequency band and / or while communicating through the multipath channel.

2 cl, 1 dwg

Description

The invention relates to the field of digital information transmission and is intended for use in synchronous digital communication systems.

When transmitting digital information, it is most preferable to use noise-like signals (SHPS) (see [1], p. 3). As a rule, signals are used as such signals, the phase manipulation of which is carried out by m-sequences (see [1], section 3.3., P. 49). As noted in [1], communication systems with ShPS have advantages over other communication systems, both in terms of noise immunity and stealth.

There is a known method of transmitting information in a communication system with SHPS, described in [2], which provides for the formation of an m-sequence, converting the code of the transmitted symbol into a cyclic time shift (DAC) and introducing into this m-sequence the indicated (information) DAC.

The disadvantage of this analogue is as follows. The encoding of the transmitted information by introducing the DAC during communication via the multipath channel into the m-sequence or into some other pseudorandom sequence (SRP) entails a problem due to the fact that when receiving a set of SRPs (more precisely, based on elementary premises (EP) ) arriving on different beams), the measurement result of the DAC introduced into these SRPs is partially masked due to the presence of delays of these SRPs relative to each other. Due to the fact that the measurement result of the DACs introduced into these SRPs underlies the decoding procedure, the presence of this masking effect leads to an extremely low noise immunity of this decoding.

In order to compensate for this negative effect, an action is applied consisting in multiplying the transmission of the SRP with the information center introduced into it by the so-called modifying SRP and in the same repeated multiplication by the specified SRP of the received signals at the receiving end of the communication system [see 3, 4]. When this action is applied at the moment of correlation processing of the electron beam, the following two effects take place in a certain ray: in the electron beam in the specified beam, the modifying SRP is compensated, at the same time, the temporal structure of the electron beam received for all other rays is destroyed. Moreover, the above masking effect is prevented.

However, the application of the action in question, in turn, is associated with a negative effect, consisting in the following. One of the radical ways to increase the speed of information transfer is the simultaneous transmission of several electronic drives in the same frequency range. With such simultaneous transmission (especially in the presence of multipath propagation, in which several EFs located in the same frequency range arrive at the receiving point for different beams), it is advisable to use SRPs characterized by such positive properties as a low level of the lateral field of the autocorrelation function ( ACF) of each SRP and a low level of cross-correlation functions (VKF) between different SRPs. SRP of the form of m-sequences are characterized by a low level of cyclic ACF [1], and SRP of the form of sequences, for example, Gold and Kasami, by low levels of both ACF and VKF [5]. When multiplying the SRP with the indicated positive properties by modifying the SRP, all these properties are lost, which, in turn, also leads to low decoding noise immunity. Thus, the disadvantage of this analogue is the low noise immunity of decoding during the simultaneous transmission of several electronic drives in the same frequency range, as well as when communicating via a multipath channel.

. Учитывая, что, например, при использовании в качестве ПСП m-последовательностей, имеет место условие N<<N_mτ, применение в указанном аналоге операции манипуляции (смены) ПСП существенно скорость обмена не повышает. Кроме того, применением в нем кодирования передаваемой информации путем введения в ПСП ЦВС при связи через многолучевой канал предопределяется наличие уже упоминавшегося (применительно к предыдущему аналогу) недостатка, а именно низкой помехоустойчивости декодирования.A known method of transmitting information in communication systems with ShPS, described in [6]. The principle of its operation is based on the encoding of the data to be transmitted by manipulation (change) of the memory bandwidth itself, as well as the introduction of the DAC in the memory bandwidth. When the base bandwidth equal to N _m τ, and the available number of bandwidth equal to N, the implementation of this analogue provides a transmission speed proportional to

. Considering that, for example, when using m-sequences as a PSP, the condition N << N _m τ holds, the use of the PSP manipulation (change) operation in the indicated analogue does not significantly increase the exchange rate. In addition, the use of encoding the transmitted information in it by introducing the DAC in the PSP during communication through the multipath channel determines the presence of the already mentioned (in relation to the previous analogue) disadvantage, namely, low decoding noise immunity.

The closest in technical essence to the claimed method is a method of transmitting information in a communication system with noise-like signals, described in [7] (prototype). The prototype includes the following operations:

upon transfer

- dividing the stream of transmitted symbols of the information signal into blocks containing L≥2 characters;

- the conversion of each of the transmitted characters into one of the predefined memory bandwidth;

- the formation of each of these SRP with DAC, determined by the combination of bits of the corresponding transmitted symbol and in accordance with the selected encoding rule;

- the formation of transmitted SHPS through the implementation of phase modulation according to the law of each of the formed PSP with a central digital center;

- the actual transmission of ShPS,

moreover, the input data of the stream splitting of the symbols to be transmitted into blocks are the input sequences of these symbols

upon admission

- conversion of received signals into electrical ones;

- determination of the maximum correlation of the received signal with SHPS formed by phase modulation according to the law of one of the predefined SRP with zero CVS;

- determination based on the indicated maximum correlation of the value of the DAC in each received symbol,

- determining the magnitude of the specified DAC in accordance with the decoding rule of the bit combination of the transmitted symbol,

moreover

в соответствующем ему блоке потока при

;- performed during transmission, the operation of dividing the stream of transmitted characters involves splitting it into blocks, is carried out with the assignment of each of these characters a sign

in the corresponding flow block at

;

- performed during the transmission operation of the formation of the SRP with the DAC at each moment of time is performed L-fold;

, при передаче вводится в

из формируемых ПСП;- DAC, determined by the combination of bits of the transmitted symbol to which the attribute is assigned

, during transmission is entered in

from formed PSP;

- the operation of combining them is performed on the results of the phase modulation operations during transmission;

.- each fragment of the received symbol stream is formed by the combination of the bits of this symbol and its attribute determined for each symbol

.

The principle of operation of the prototype is to implement the separation of the stream of transmitted characters into blocks, marking each of the characters according to its temporary position inside the block, transferring all the symbols of the same block simultaneously and subsequent (upon receipt) restoring their order in the block based on the indicated marking.

The prototype is characterized by a higher transmission rate than all the other analogues listed above. At the same time, it, like the aforementioned analogues, implements the encoding of a significant part of the transmitted information by manipulating the DACs introduced into the SRP, due to which (as in the indicated analogues) it is characterized by low noise immunity of decoding (or noise immunity of information transmission) when simultaneous transmission of several electronic transmissions in the same frequency range (as well as in multipath propagation).

The aim of the proposed method is to increase the noise immunity of the transmission of information while simultaneously transmitting several electronic drives in the same frequency range and / or when communicating via a multipath channel.

The goal is achieved by the fact that in the method of transmitting information in a communication system with a ShPS, the implementation of which perform the following operations:

upon transfer

при

;- divide the stream of transmitted characters by splitting it into blocks containing L≥2 characters, with the assignment to each of the characters included in the same block, a sign

at

;

- convert each of the L transmitted characters of each block individually into one of the predetermined pseudo-random sequences (PSP) in accordance with the encoding rule;

- form a set of L elementary premises (EP) by phase modulation according to the law of each of the generated SRP;

- combine formed by the block;

- transmit the results of combining the EP block,

moreover, the input data of the stream splitting operation of the symbols to be transmitted are the input sequences of these symbols,

upon admission

- convert the received signals into electrical;

- at each information transmission cycle, the correlation maxima of the signal implementation adopted at this cycle are determined L-fold with a set of N support functions, each of which coincides in shape with one of the N possible EP alternatives, each of which is formed by phase modulation according to the law corresponding from beforehand specified memory bandwidth;

- form the decoding results of each block of the received symbol stream according to the totality of the results of the operation of determining L the indicated maximums of correlation, also perform the following operations:

upon transfer

, первый из которых, а именно

, изменяющийся в диапазоне значений 1…L, совпадает с номером подмассива, в который входит эта ПСП, а второй, а именно j, изменяющийся в диапазоне значений 1…J, совпадает с номером ПСП в этом подмассиве, причем указанная операция предусматривает преобразование того символа, которому присвоен признак

, в ту из N ПСП, первый индекс которой также равен

, а ее второй индекс равен бинарному коду указанного символа;- the rule according to which the operation of converting each of the L transmitted symbols of each block individually into one of the predetermined memory bandwidths is realized by preliminary dividing an array of N predetermined memory bandwidths into L subarrays, each of which contains J = N / L memory bandwidth, each of N PSP is assigned a pair of indices

, the first of which, namely

, varying in the range of values 1 ... L, coincides with the number of the subarray in which this PSP is included, and the second, namely j, changing in the range of values 1 ... J, coincides with the number of the SRP in this subarray, and this operation involves the conversion of that symbol to which the attribute is assigned

, in that of N PSP, the first index of which is also equal to

, and its second index is equal to the binary code of the specified character;

upon admission

- the operation of determining the maximums of the correlation of the received signal with the set of support functions at each information transfer cycle is performed on the results of calculating the indicated correlation with the specified support functions, the number of which is N, separately inside each subarray of these support functions corresponding to a subarray of SRP, using which these support functions formed;

определяют индекс

той ПСП, которой соответствует один из указанных максимумов для

подмассива опорных функций;- according to the results of determining the indicated correlation maxima at each index value

determine the index

that PSP, which corresponds to one of the indicated maxima for

a subarray of support functions;

формируют совокупность битов символа, входящего в

подмассив блока, в соответствии правилом декодирования;- by the result of determining each index value

form a set of bits of the character included in

block subarray, in accordance with the decoding rule;

в диапазоне от 1 до L.- the operation of generating the results of decoding a block of symbols is carried out by arranging an array of bits of each symbol included in this block in a temporal order corresponding to a change in indices

in the range from 1 to L.

A flowchart illustrating a set of operations of the proposed method for transmitting information in a digital communication system with noise-like signals is shown in FIG. 1, where the following operations are indicated:

при

;1 - separation of the stream of transmitted characters by splitting it into blocks containing L≥2 characters, with the assignment to each of the characters included in the same block, a sign

at

;

символа);2 - the conversion of each of the L transmitted characters of each block separately into one of the predetermined SRP in accordance with the encoding rule (operation 2 is presented in Fig. 1 as a set of operations 2.1 ... 2.L, each of which performs the specified conversion of the corresponding

character);

ЭП);3 - the formation of a set of L EFs through phase modulation according to the law of each of the generated SRPs (operation 3 is presented in Fig. 1 as a set of operations 3.1 ... 3.L, each of which performs the formation of the corresponding

EP);

4 - the union of the formed electronic block;

5 - transmission of the results of combining the electronic block;

6 - conversion of received signals into electrical ones;

подмассива блока);7 - L-fold determination of the correlation maximums received at the implementation of the signal with a set of N support functions (operation 7 is shown in Fig. 1 as a combination of operations 7.1 ... 7.L, each of which performs the indicated maximum determination with the support functions of the corresponding

block subarray);

индекса

той ПСП, которой соответствует максимум корреляции для каждого

подмассива опорных функций (операция 8 представлена на фиг. 1 как совокупность операций 8.1…8.L, каждая из которых выполняет указанное определение пары индексов для соответствующего

подмассива опорных функций);8 - definition for each index value

index

the bandwidth corresponding to the maximum correlation for each

a subarray of support functions (operation 8 is presented in Fig. 1 as a set of operations 8.1 ... 8.L, each of which performs the indicated definition of a pair of indices for the corresponding

subarray of support functions);

подмассив блока);9 - the formation of the decoding results of each of the pleasant characters of the block (operation 9 is shown in Fig. 1 as a set of operations 9.1 ... 9.L, each of which performs the formation of a set of bits of the symbol included in the corresponding

block subarray);

10 - formation of the decoding results of the received block of characters.

When describing the proposed method, the following notation was used (basically they have already been introduced above, but here they are presented compactly): N is the number of predetermined SRPs; L is the number of characters in each block; J is the number of SRPs used in encoding (or for encoding) one symbol (or the number of EP alternatives that can be generated as a result of encoding one symbol), with J = N / L; n is the number of bits contained in one symbol, and n = log ₂ J. By the parameter N is meant its available value (the rule for its definition is given, for example, in [5]).

при

) реализуется следующим образом (практически так же, как и аналогичная операция прототипа с той лишь разницей, что, если при описании прототипа количество битов в одном символе было обозначено как n - k, то в настоящем описании - как n). Например, осуществляется запоминание фрагмента потока, содержащего L⋅n бит подлежащей передаче информации, что соответствует блоку из L символов. При указанном запоминании все биты информации записываются в оперативную память емкостью L⋅n бит (здесь и далее упоминаются компоненты цифровых аппаратно-программных средств, реализующих заявляемый способ). Адреса (номера) ячеек памяти, в которые записывается указанная информация, например, соответствуют порядку следования этих бит. В этом случае признаком символа «

» в составе блока является его порядковый номер следования в этом блоке; при этом символу, n бит которого записаны в ячейки с номерами 1…n, присваивается признак

, символу, n бит которого записаны в ячейки с номерами n+1, …2⋅n, присваивается признак

и т.д. Такой принцип формирования признаков, являющийся простейшим, и рассматривается далее. Однако возможны и иные варианты определения признака

, например, в качестве этого признака может быть его номер, при нумерации символов в инверсном порядке.Operation 1 (dividing the stream of transmitted characters by splitting it into blocks containing L≥2 characters, assigning to each of the characters included in the same block a sign

at

) is implemented as follows (in almost the same way as the similar operation of the prototype with the only difference being that if, when describing the prototype, the number of bits in one symbol was designated as n - k, then in the present description as n). For example, a fragment of a stream containing L⋅n bits of the information to be transmitted is stored, which corresponds to a block of L symbols. With this storage, all bits of information are written into RAM with a capacity of L⋅n bits (hereinafter, components of digital hardware and software that implement the inventive method are mentioned). The addresses (numbers) of memory cells into which the indicated information is written, for example, correspond to the order of these bits. In this case, the sign of the symbol "

»In the block is its sequence number in this block; in this case, the symbol, n bits of which are recorded in the cells with the numbers 1 ... n, is assigned the attribute

, a character whose n bits are recorded in cells with numbers n + 1, ... 2⋅n, is assigned the attribute

etc. This principle of formation of signs, which is the simplest, is considered further. However, other options for determining the sign are possible.

, for example, this attribute may be its number, when numbering the characters in reverse order.

из которых выполняет указанное преобразование соответствующего

символа в

ПСП. При этом все заданные (теоретически доступные при их заданной длине) ПСП заранее разбиты на L подмассивов, содержащих по J ПСП, и каждой из N ПСП присваивается пара индексов

. При этом индекс ПСП

соответствует номеру подмассива, в который входит данная ПСП, а индекс j - номеру этой ПСП внутри этого

подмассива.Operation 2 (the conversion of each of the L transmitted characters of each block separately into one of the predetermined SRPs in accordance with the encoding rule) is performed on the results of operation 1 as a set of independently implemented operations 2.1 ... 2.L, each

of which performs the specified conversion of the corresponding

character in

PSP. Moreover, all given (theoretically accessible at their given length) SRPs are preliminarily divided into L subarrays containing J SRPs each, and each of the N SRPs is assigned a pair of indices

. At the same time, the PSP index

corresponds to the number of the subarray in which this SRP is included, and the index j to the number of this SRP inside this

subarray.

символ кодируемого блока преобразуется в одну из ПСП, входящих в

подмассив, т.е. в одну из ПСП, первый индекс которых равен

, при этом второй индекс этой ПСП j равен, например, бинарному коду указанного символа. (Это и есть правило кодирования).Each of these SRPs is, for example, a Gold sequence (or code) and is formed in accordance with the rule illustrated, for example, in [5]. The peculiarity of the content of operation 2 (a set of independently implemented operations 2.1 ... 2.L) in comparison with the similar operation of the prototype is as follows. Everyone

the character of the encoded block is converted into one of the memory bandwidth included in

subarray, i.e. into one of the memory bandwidths whose first index is

, while the second index of this PSP j is equal, for example, to the binary code of the indicated symbol. (This is the encoding rule).

ПСП, сформированной в результате выполнения каждой соответствующей операции

, на тональный сигнал несущей частоты. Как и в прототипе, несущие частоты разных ПСП могут как совпадать, так и быть различными. В последнем случае различия несущих частот могут быть, в частности, соизмеримы с разрешающей способностью формируемых ЭП по частоте.Operation 3 (the formation of a set of L EP by phase modulation according to the law of each of the generated SRP) is performed by multiplying the time implementation of each

PSP formed as a result of each relevant operation

, on a carrier tone. As in the prototype, the carrier frequencies of different SRPs can both coincide and be different. In the latter case, the differences in carrier frequencies can be, in particular, commensurate with the frequency resolution of the generated ES.

ПСП на тональный сигнал несущей частоты, именуется как

альтернатива ЭП.Further, each alternative to the EP resulting from the multiplication of the temporary implementation

SRP on a carrier tone, referred to as

alternative to EP.

Operation 4 (combining the generated EP block) is performed on the totality of the results of operation 3 and can be implemented in the variant of summing all the results of the specified operation 3. As a result of this operation, the EP block to be transmitted is formed. This operation completely coincides with the corresponding operation of the prototype.

Operation 5 (transmission of the results of combining the EC unit) is implemented by converting electrical signals generated as a result of operation 4, for example (in the case of a sound-underwater or sonar communication system) into acoustic vibrations of the aqueous medium. In this case, it is implemented by a sonar emitter. This operation completely coincides with the corresponding operation of the prototype. The transmission and reception time interval of one ES unit (minus the propagation time of signals between the transmission and reception points) is the transmission and reception cycle of information (i.e., the communication system operation cycle).

Operation 6 (conversion of the received signals into electrical signals) in the considered example of a sound supply system involves the conversion of acoustic vibrations of the aqueous medium into electrical signals. In this case, it is realized by a hydrophone or, in a more complicated case, an antenna array containing a set of hydrophones, a set of delay lines and an adder (see [8], Fig. 1.5b, 1.6 and 1.7). This operation completely coincides with the corresponding operation of the prototype.

реализуется посредством вычисления корреляции (скалярного произведения) между массивом временных отсчетов входного для этой операции сигнала и каждой из J опорных функций (т.е. указанная корреляция при декодировании одного блока ЭП вычисляется J-кратно). Каждая j-я (при j=1…J) опорная функция, используемая при выполнении каждой операции

(при

), совпадает по форме с ЭП, сформированной посредством фазовой модуляции по закону каждой j-й (при j=1…J) ПСП, входящей состав

подмассива (т.е. указанная опорная функция совпадает по форме с

альтернативой ЭП). Результат (его амплитуда) вычисления корреляции между массивом временных отсчетов входного для рассматриваемой операции сигнала и j-й опорной функцией, используемой при выполнении операции

, обозначается как

.Operation 7 (L-fold determination of the correlation maximums received at the implementation of the signal with a set of N support functions) is performed on the results of operation 6. It is a set of independently performed operations 7.1 ... 7.L. Every operation

it is implemented by calculating the correlation (scalar product) between the array of time samples of the input signal for this operation and each of the J reference functions (i.e., the specified correlation is computed J-times when decoding one block of electronic components). Each j-th (for j = 1 ... J) support function used in each operation

(at

), coincides in form with the electron beam formed by phase modulation according to the law of each j-th (for j = 1 ... J) SRP, which includes the composition

subarray (i.e., the indicated support function coincides in form with

alternative to EP). The result (its amplitude) of calculating the correlation between the array of time samples of the input signal for the operation in question and the jth reference function used in the operation

is denoted as

.

из операций 7.1…7.L операция вычисления совокупности из J корреляций дополняется операцией нахождения максимального по амплитуде результата из массива, включающего J результатов указанного вычисления корреляции

, т.е. определяется (вычисляется) величинаWhen performing each

from operations 7.1 ... 7.L, the operation of calculating a set of J correlations is supplemented by the operation of finding the maximum amplitude result from an array including J results of the specified correlation calculation

, i.e. determined (calculated) value

,

,

при фиксированном индексе

).(this entry means finding the maximum at index j from an array of levels

at a fixed index

)

индекса

той ПСП, которой соответствует максимум корреляции для каждого

подмассива опорных функций) в соответствии со своим названием предусматривает определение того индекса j, которому при каждом фиксированном значении индекса

соответствует величина (амплитуда)

. Указанный индекс обозначается как

(эта запись означает, что максимум определен при выполнении операции

). Данная операция при каждом фиксированном значении индекса

выполняется над совокупностью амплитуд

с учетом результата выполнения операции

(т.е. с учетом результата определения величины

) посредством, например, последовательного сравнения величины (амплитуды)

с величинами

и нахождения индекса той из них, которая совпадает с величиной

. Указанный индекс обозначается как

.Operation 8 (determination for each index value

index

the bandwidth corresponding to the maximum correlation for each

subarray of support functions), in accordance with its name, provides for the determination of the index j to which, for each fixed value of the index

corresponds to the value (amplitude)

. The specified index is indicated as

(this entry means that the maximum is determined during the operation

) This operation for every fixed index value

performed on a set of amplitudes

taking into account the result of the operation

(i.e., taking into account the result of determining the quantity

) by, for example, sequential comparison of magnitude (amplitude)

with values

and finding the index of the one that matches the value

. The specified index is indicated as

.

реализуется путем формирования совокупности битов

символа блока. Правило формирования совокупности битов следующее (пример): эта совокупность битов есть величина индекса

, представленная в виде бинарного кода.Operation 9 (generating the decoding results of each of the received block symbols) is performed on the results of operation 8. It is a set of independently performed operations 9.1 ... 9.L. Every operation

implemented by forming a set of bits

block symbol. The rule for generating a set of bits is as follows (example): this set of bits is an index value

represented as binary code.

символа (т.е. символа, следующего в переданном блоке первым) располагаются как биты блока с 1-го по n-й, совокупность n битов

символа (т.е. символа, следующего в переданном блоке вторым) располагаются как биты блока с n+1-го по 2n-й, …, совокупность n битов

символа располагаются как биты блока

по

.Operation 10 (the formation of the decoding results of the received block of characters) is implemented as follows. Set of n bits

characters (i.e., the character following the first in the transmitted block) are arranged as bits of the block from the 1st to the nth, a set of n bits

characters (i.e. the character following the second in the transmitted block) are arranged as bits of the block from n + 1 through 2 n-th, ..., a set of n bits

characters are arranged as bits of a block

by

.

The inventive method, like the prototype, is designed for use in a synchronous communication system. In such a system, at the receiving end, the moments of the beginning of arrival of each ES block are known. In principle, it is possible, for example, the option of the transmitter and receiver in a single time system. Moreover, as regards the synchronization of the operation of devices that implement signal processing operations at the receiving end, the propagation time of the signal from the transmitter to the receiver is known, and the equipment that implements the reception operations includes a timer that generates a synchronization signal that controls the execution of all operations that are implemented when receiving (except for operation 6 converting the received signals into electrical signals) at the time of the start of the arrival of the next fragment of the transmitted stream. At the moment of formation of this signal, filling with the received signal of the first fragment of the buffer memory of the blocks implementing the operations 7.1 ... 7.L begins. Then, after a time interval (from the moment of formation of the conditionally specified first synchronization signal), equal to the duration of the electronic signal, the next synchronization signal is generated; this starts filling in the second fragment of the buffer memory with the received signal in the blocks that implement operations 7.1 ... 7.L, and the signals stored in the first fragments of the buffer memory carry out the operations of calculating the cyclic convolution, then sequentially other operations 8 ... 10. Further, after a time interval (from the moment of formation of the conditionally specified first synchronization signal) equal to twice the duration of the electronic signal, a conditionally third synchronization signal is generated; at the same time, the reception of the first fragment of the buffer memory of the blocks implementing the operations 7.1 ... 7.L starts again, and the signals stored in the second fragments of the buffer memory carry out the operations of calculating the cyclic convolution, then sequentially other operations 8 ... 10, etc.

The set of synchronization operations is not included in the composition of the claimed object, since the vast majority of digital (discrete) communication systems are synchronous, and the features of the claimed object are not associated with any specifics of the specified set of operations.

Operations 1 ... 4 and 7 ... 10 are implemented by programmable digital signal processing.

The above description of the contents of the operations of the proposed method (along with explanations regarding synchronization) actually reveal its work in dynamics, namely the operations of the proposed method are performed sequentially in ascending order of their numbers. In this case, multi-channel operations (i.e., operations 2.1 ... 2.L, 3.1 ... 3.L, 7.1 ... 7.L, 8.1 ... 8.L and 9.1 ... 9.L) with the same first index (i.e., at the first index, equal to 2, 3, 7 ...) are executed simultaneously (i.e., for example, operations 2.1 ... 2.L are simultaneously performed).

», однозначно характеризующим его временное положение в совокупность из L символов, составляющих блок (именуемый в описании прототипа фрагментом сообщения). Этой маркировкой обеспечивается возможность восстановления на приемном конце системы связи фрагмента сообщения при одновременной передаче всех L символов этого фрагмента. При этом, если в прототипе кодирование каждого передаваемого символа осуществлялось путем ввода ЦВС в ПСП (в качестве таких ПСП в описании прототипа фигурируют m-последовательности), то в заявляемом способе - путем выбора ПСП из J альтернатив.The principle of operation of the proposed method for transmitting information in communication systems with ShPS is as follows. As in the prototype, in the claimed method, each of the symbols to be transmitted is marked with the sign "

", Clearly characterizing its temporary position in the aggregate of L characters making up the block (referred to in the description of the prototype message fragment). This marking makes it possible to restore a message fragment at the receiving end of the communication system while transmitting all L symbols of this fragment. Moreover, if in the prototype the encoding of each transmitted symbol was carried out by entering the DAC in the SRP (as such SRP, m-sequences appear in the description of the prototype), then in the claimed method, by selecting the SRP from J alternatives.

As the main type of SRP, intended for use in the claimed method, Gold sequences (codes) are considered. The rule for the formation of such sequences provides for the symbolic addition of 2 components of the preferred pair of m-sequences modulo 2 (for the definition of the preferred pair of m-sequences, see, for example, [5]), one of which contains a DAC, and the set of given SRPs is formed by varying the indicated DAC . So, if the prototype provides the principle of encoding each transmitted symbol by varying the DAC introduced in the SRP (for example, in the m-sequence), then the claimed method provides the principle of encoding each symbol by selecting (varying) one of the J alternative Gold sequences (i.e. E. In fact, by varying the CVC introduced into one of the preferred pair of m-sequences). In this regard, in the indicated methods there are differences in the encoding principles, the consequence of which is that if, when decoding the ES in the prototype, the evaluation operation of the DSP introduced in the SRP was performed, then in the claimed method the operation of determining that one of the J SRP (i.e. Gold sequence), the choice of which in operations 2.1 ... 2.J on the transmitting side of the communication system was encoded decoded character. This fundamental difference is due to the achieved technical effect. Otherwise, the principle of operation of the proposed method with the principle of action of the prototype coincides.

As noted in the description of the prototype, the reason for the low noise immunity of decoding during its application was the fact that it provided for the coding principle based on the introduction of the DAC on the transmitting side in the SRP and its evaluation on the receiving side. In the claimed method, this negative circumstance is circumvented (see the text of the previous paragraph). Thus, in the inventive method, the technical effect of increasing the noise immunity of decoding is achieved.

The conformity of the proposed method to the criterion of "inventive step" is due to the fact that the totality of the features appearing in the characterizing part of the claims of the invention clearly does not follow from the prior art.

Literature

1. Varakin L.E. Communication systems with noise-like signals. M .: Radio and communication. 1985.338 s., Ill.

2. Nikolaev R.P., Popov A.R. A method of transmitting information in a communication system with noise-like signals. Pat. RF №2286017.

3. Bobrovsky I.V., Efimov S.G. Experimental studies of a hydroacoustic system for transmitting information with complex noise-like signals in a shallow sea // Transactions of the 6th international conference “Applied technologies of hydroacoustic and hydrophysics”. St. Petersburg, 2002, S. 389.

4. Krantz V.Z., Sechin V.V. Using information symbols to synchronize a communication system with complex signals // Hydroacoustics. Vol. No. 15, 2012. S. 36-41.

5. Nevdyaev L. CDMA: signals and their properties // Networks / network world. No. 11, 2000.

6. Ozerov I.A., Ozerov S.I. A method of transmitting information in communication systems with noise-like signals and a software product. Pat. RF №2277760.

7. Golubev A.G. A method of transmitting information in a communication system with noise-like signals Pat. RF 2548188.

8. Smaryshev M.D., Dobrovolsky Yu.Yu. Hydroacoustic antennas. Directory. - L .: Shipbuilding. 1984.

Claims (22)

1. The method of transmitting information in a communication system with noise-like signals (SHPS), which consists in the fact that upon transfer divide the stream of transmitted symbols of the information signal by splitting it into blocks containing L≥2 characters; assign to each of the characters included in the same block, the attribute l for l = 1 ... L; converting each of the L transmitted symbols of each block individually into one of a predetermined pseudo-random sequence (PSP) in accordance with the encoding rule; form a set of L elementary premises (EP) of the block by phase modulation according to the law of each of the generated SRP; combine the formed block electrons; transmit the results of combining EP moreover, the input data of the stream splitting operation of the symbols to be transmitted are the input sequences of these symbols, upon admission convert the received signals into electrical ones; at each information transmission cycle, the maximums of correlation of the signal implementation adopted at this cycle with a set of N support functions, each of which coincides in shape with one of the N possible EP alternatives, each of which is formed by phase modulation according to the law corresponding to N in advance, are determined L-times specified memory bandwidth; form the results of decoding of each received block of characters according to the totality of the results of the operation of determining L of the indicated maximums of correlation, characterized in that upon transfer the rule according to which the operation of converting each of the L transmitted symbols of each block separately into one of the predetermined memory bandwidths is realized by preliminary dividing an array of N predetermined memory bandwidths into L subarrays, each of which contains J = N / L memory bandwidth, each of these N PSPs, a pair of indices l, j is assigned, the first of which, namely l, varying in the range of values 1 ... L, coincides with the number of the subarray that this PSP is in, and the second, namely j, varying in the range values 1 ... J, coincides with the SRP number in this subarray, and the specified operation provides for the conversion of the symbol to which the attribute l is assigned to that of N SRP, the first index of which is also equal to l, and its second index j is equal to the binary code of the specified symbol, upon admission the operation of determining the correlation maxima of the received signal with the set of support functions at each clock cycle of the information transmission system is performed on the results of calculating the indicated correlation with the specified support functions, the number of which is N, separately inside each subarray of these support functions corresponding to a subarray of SRP, using which these support functions are formed; based on the results of the operation to determine the maximum correlation of the received signal with the set of support functions of each l-th subarray, determine the index j _{l of} that SRP to which this maximum corresponds; according to the result of determining each index value j _l form a set of bits of the character included in the l-th subarray of the block, in accordance with the decoding rule, the inverse of the encoding rule; the operation of generating the decoding results of each pleasant block of symbols is carried out by arranging in this block an array of bits of each symbol included in this block in a temporal order corresponding to a change in the indices l in the range from 1 to L. 2. The method of transmitting information in a communication system with a BBA according to claim 1, characterized in that each of the specified SRPs is formed by symbolically adding modulo 2 two components of the preferred pair of m-sequences, one of which is introduced cyclic time shift (CVS), moreover, the set of predetermined SRP is formed by varying the indicated DAC using the same preferred pair of m-sequences.

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