RU2024207C1 - Device to multiplex communicating channel - Google Patents

Abstract

FIELD: multichannel communication. SUBSTANCE: device has weight factors calculation unit 1, permanent memory unit 2, N digit-analogous converters 3, N multipliers 4, summator 5, channel signals frequency standard generator 6, delay unit 7, clock-pulse generator 8. Quasi-orthogonal signals are used as standard ones, inter-correlation factors of which are known, constant and recorded in unit 2. Process of multiplexing provides for summing up of frequency standard channel signals multiplied by respective weight factor. The factors are calculated using following matrix equation:

with /R - matrix of correlation factors,

- required factors vector,

- vector of information signals. Line signal is determined by equation

with X - value of group signal,

- vector of standard frequency channel signals. After received signal X is multiplied by respective standard frequency channel signal, it takes form of

with

Description

 The invention relates to telecommunications and can be used to seal communication lines.

 The purpose of the invention is to increase noise immunity.

 The drawing shows a structural diagram of a device for sealing a communication channel.

 The communication channel sealing device comprises a weight coefficient calculation unit 1, a constant memory unit 2, N digital-to-analog converters (DACs) 3, N multipliers 4, an adder 5, a generator of reference channel signals 6, a delay unit 7, a clock generator 8.

A_i...S_i(t) , (I) где А_i - постоянные коэффициенты, являющиеся функцией вектора передаваемых дискретных сообщений <С₁,...,С_N> и матрицы коэффициентов корреляции || r_ij || пар опорных канальных сигналов S_i(t) длительностью Т.The main objective of the proposed device is the linear compression of channel signals according to the rule
X _gr (t) =

A _i ... S _i (t), (I) where А _i are constant coefficients, which are a function of the vector of transmitted discrete messages <С ₁ , ..., С _N > and the matrix of correlation coefficients || r _ij || pairs of reference channel signals S _i (t) of duration T.

подбираются так, чтобы на приемной стороне при разделении каналов по форме отклик на выходе каждого канала обработки однозначно соответствовал бы только передаваемому сообщению по данному каналу, но не зависел бы от сообщений, передаваемых по соседним каналам, т. е. взаимные помехи, образованные мешающими сигналами, должны взаимно компенсировать друг друга.Moreover, the coefficients A _i , i =

are selected so that on the receiving side, when dividing the channels in shape, the response at the output of each processing channel would uniquely correspond only to the transmitted message on this channel, but would not depend on messages transmitted on adjacent channels, i.e., mutual interference caused by interfering signals must mutually compensate each other.

X_вх(t)·S_j(t)dt = C_jV_c+η_j, что можно переписать в виде
Y_j= V_c

A_ir_ij+ η_j= C_jV_c+ η_j, (2) где Х_вх(t) = X_гр(t) + η (t),
V_c=

S $\genfrac{}{}{0ex}{}{\text{2}}{\text{i}}$ (t)dt, i =

, r_ij=

S_i(t)S_j(t)dt - смесь группового сигнала и шума приемника соответственно, напряжение полезного сигнала и коэффициент корреляции между сигналами S_i(t), S_j(t).For this, in each channel of the receiver processing, the output voltage of the correlator at the moment of completion of the group signal should be equal
Y _j =

X _I (t) · S _j (t) dt = C _j V _c + η _j , which can be rewritten as
Y _j = V _c

A _i r _ij + η _j = C _j V _c + η _j , (2) where X _вх (t) = X _gr (t) + η (t),
V _c =

S $\genfrac{}{}{0ex}{}{\text{2}}{\text{i}}$ (t) dt, i =

, r _ij =

S _i (t) S _j (t) dt is a mixture of the group signal and receiver noise, respectively, the voltage of the useful signal and the correlation coefficient between the signals S _i (t), S _j (t).

при заданных значениях коэффициентов корреляции r_ij, хранящихся в блоке 2 и соответствующих системе опорных канальных сигналов S_i(t), i =

, и при передаваемых в данный момент времени сообщениях С_i, i =

. Это осуществляется путем решения системы линейных алгебраических уравнений
A₁r₁₁ + A₂r₁₂ + ... + A_Nr_1N = C₁,
A₁r₂₁ + A₂r₂₂ + ... + A_Nr_2N = C₂, (3)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Thus, the main task of block 1 is to calculate the coefficients A _i , i =

for given values of the correlation coefficients r _ij stored in block 2 and corresponding to the system of reference channel signals S _i (t), i =

, and with messages C _i , i =

. This is done by solving a system of linear algebraic equations
A ₁ r ₁₁ + A ₂ r ₁₂ + ... + A _N r _1N = C ₁ ,
A ₁ r ₂₁ + A ₂ r ₂₂ + ... + A _N r _2N = C ₂ , (3)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. Результаты решения A_i, i =

в двоичном коде поступают на соответствующие ЦАП 3, преображаются в аналоговые импульсы длительностью Т, которые перемножаются с соответствующими сигналами S_i(t) в перемножителях 4, линейно складываются в сумматоре 5 и в виде реализации группового сигнала с помощью передатчика передаются в канал связи.A ₁ r _N1 + A ₂ r _N2 + ... + A _N r _NN = C _N , which is obtained from the system of equalities (2) by dividing them by V _c and subtracting the terms η _i , i = from their left and right parts

. The results of the solution A _i , i =

in binary code, they are fed to the corresponding DAC 3, converted into analog pulses of duration T, which are multiplied with the corresponding signals S _i (t) in the multipliers 4, linearly added up in the adder 5 and transmitted to the communication channel in the form of a group signal using a transmitter.

вырабатываемых ИИ. С помощью каждого тактового импульса происходит запуск блока 1, выдача на его первые входы N символов С_i, i =

с ИИ, на вторые N² входов значений коэффициентов r_ij, ij =

блока 2. Результаты решений блоком 1 выдаются по приходу тактового импульса, задержанного в блоке задержки 7, на его второй управляющий вход. Данный импульс поступает и на вход генератора 6 для управления формированием им опорных канальных сигналов S_i(t). При этом время вычисления блоком 1 коэффициентов A_i не должно превышать длительности одной реализации сигнала Х_гр(t).Rhythm of the device 11 controls the GTI, which generates clock pulses _whith t << T with a repetition rate of information symbols _uu = t

AI generated. With the help of each clock pulse, block 1 starts up, and N symbols С _i , i = are output to its first inputs

with AI, on the second N ² inputs of the values of the coefficients r _ij , ij =

block 2. The results of decisions by block 1 are issued upon arrival of a clock pulse delayed in delay block 7 to its second control input. This pulse is fed to the input of the generator 6 to control the formation of the reference channel signals S _i (t). In this case, the calculation time by block 1 of the coefficients A _i should not exceed the duration of one implementation of the signal X _g (t).

Claims (1)

 A COMMUNICATION CHANNEL SEALING device, comprising N multipliers, where N is the number of compressed signals, an adder, a reference channel signal generator and a clock generator, the first input of each multiplier connected to the corresponding output of the reference channel signal generator, and the output of each multiplier connected to the corresponding input of the adder, the output of which is the output of the device, characterized in that, in order to increase the noise immunity, series-connected read-only memory unit and the computing unit are introduced weight coefficients, N outputs of which are connected through the corresponding digital-to-analog converter to the second input of the corresponding multiplier, and a delay unit is introduced, the input of which is connected to the output of the clock generator, the input of the read-only memory block and the second input of the weight coefficient calculation unit, the third input of which is connected to the input the generator of the reference channel signals and the output of the delay unit, and the N fourth inputs of the unit for calculating the weight coefficients are information inputs of the device Properties.