System for transferring discontinuous information

FIELD: electric communications engineering, in particular, engineering of multichannel communication systems.

SUBSTANCE: system for transmitting discontinuous information contains at transmitting side information sources, multipliers, adder, clock generator, Walsh functions generator, 2n keys (where 2n - number of outputs of Walsh functions generator) and frequency splitter, two elements of one-sided conductivity and 2n additional multipliers, and on receiving side - clock generator, Walsh functions generator, multipliers, integrators, information receivers, 2n keys and frequency splitter, two elements of one-sided conductivity and 2n additional multipliers. As a new addition, on transmitting side two one-sided conductivity elements are inserted and 2n additional multipliers, and on receiving side - two one-sided conductivity elements and 2n additional multipliers.

EFFECT: decreased frequency band due to decreased effective width of channel carriers spectrum.

6 dwg, 1 tbl

 

The invention relates to the field of telecommunications, in particular to a multi-channel communication systems.

A device for transmitting and receiving digital information containing on the transmission side sources of information blocks multiplication, function generator Walsh, the adder, and at the receiving side of data receivers, function generator Walsh and correlators, consisting of blocks of multiplication and integrators (see the Federal Republic of Germany patent No. 1959175, CL H 04 J 11/00, 1976).

However, in this device for sending and receiving digital data as the channel vectors are functions of the Walsh system which has a large effective width of the spectrum, which leads to low efficiency of use of frequency bands allocated for this device.

The closest in technical essence of the present invention is a system for the transmission of discrete information containing on the transmission side information sources, multipliers, an adder, a clock generator, function generator Walsh, 2nkeys (where 2n- number of outputs of the function generator Walsh) and the frequency divider, and outputs information sources connected with the first inputs of the multipliers, the outputs of which are connected with inputs of the adder, the output of which is connected to the communication line, the output of the clock generator is connected to the input of the function generator Walsham to the input of the frequency divider, the output of the frequency divider is connected to control inputs of keys, the first information input of each of the i-th (i=1,...,2nthe key is connected to the i-th generator output of the Walsh function, the second information input of each of the i-th key is connected to (2n-1-i)-th generator output of the Walsh function, the output of each key is connected with the second input of the corresponding multiplier, and at the receiving side the oscillator, multipliers, integrators, receivers of information, 2nkeys and the frequency divider, and the output of the clock generator is connected to the input of the function generator Walsh, the first inputs of the multipliers are connected to the communication line, the outputs of the multipliers are connected to the inputs of the integrators, the outputs are connected to the inputs of the receivers of the information, the output of the clock generator is connected to the input of the frequency divider, the output of which is connected to the control inputs of the keys, the first information input of each key is connected to the i-th generator output of the Walsh function, the second information input of each key is connected to (2n+1-i)-th generator output of the Walsh function, and the output of each switch is connected to the second input of the corresponding multiplier (see RF patent №2025901 on application No. 4844150/09 (069146) from 25.06.90, CL H 04 J 11/00).

However, in this system of discrete information transmission as the channel vector signals are used, the system which is no more effective width of the spectrum, that leads to low efficiency of use of the band.

The aim of the invention is to reduce the bandwidth by reducing the effective width of the spectrum of the channel vectors.

This objective is achieved in that in the known transmission system discrete information containing on the transmission side information sources, multipliers, an adder, a clock generator, function generator Walsh, 2nkeys (where 2n- number of outputs of the function generator Walsh) and the frequency divider, and outputs information sources connected with the first inputs of the multipliers, the outputs of which are connected with inputs of the adder, the output of which is connected to the communication line, the output of the clock generator is connected to the input of the function generator Walsh and to the input of the frequency divider, the output of the frequency divider is connected to control inputs of keys, the first information input of each of the i-th (where i=1,...,2nthe key is connected to the i-th generator output of the Walsh function, the second information input of each of the i-th key is connected to (2n-1-i)-th generator output of the Walsh function, and at the receiving side the oscillator, function generator Walsh, multipliers, integrators, receivers of information, 2nkeys and the frequency divider, and the output of the clock generator is connected to the input of the function generator Walsh, the first inputs of the multipliers under the turned off the communication line, the outputs of the multipliers are connected to the inputs of the integrators, the outputs are connected to the inputs of the receivers of the information, the output of the clock generator is connected to the input of the frequency divider, the output of which is connected to the control inputs of the keys, the first information input of each key is connected to the i-th generator output of the Walsh function, the second information input of each key is connected to (2n+1-i)-th output of the function generator Walsh introduced on the transmission side two elements unilateral conductivity and 2nadditional multipliers, and the output of each key is connected to the first input of the corresponding additional multiplier, the output of which is connected with the second input of the corresponding multiplier, 2nthe first output of the function generator Walsh connected to the inputs of the elements unilateral conduction, the output of the first element unilateral conductivity is connected with the second inputs of the k-x additional multipliers (where k=1,...,2n-1), the output of the second element unilateral conductivity is connected with the second inputs l-x additional multipliers (where I=2n-1+1,...,2n), and at the receiving side two element unilateral conductivity and 2nadditional multipliers, and the output of each key is connected to the first input of the corresponding additional multiplier, the output of which is connected with the second is the input of the corresponding multiplier, 2nthe first output of the function generator Walsh connected to the inputs of the elements unilateral conduction, the output of the first element unilateral conductivity is connected with the second inputs of the k-x additional multipliers (where k=1,...,2n-1), the output of the second element unilateral conductivity is connected with the second inputs l-x additional multipliers (where I=2n-1+1,...,2n).

Figure 1 presents the structural electrical diagram of the proposed system of discrete information transmission, figure 2 - structural diagram of two-input key figure 3 - timing diagram illustrating the process of forming the carrier channel information S'(6,θ) in the proposed system, transmission, 4 - channel type carriers generated in the analog, figure 5 - type of channel vectors generated in the prototype, figure 6 - type of channel vectors generated in the transmission system.

Transmission system discrete contains information on the transmission side source 1 information, multipliers 2, the adder 3, the clock generator 4 generator 5 of the Walsh function keys 6, the divider 7 frequency on the receiving side - multipliers 8, the clock generator 9 generator 10 of the Walsh function, the integrators 11, the receiver 12 of the information, the keys 13, the divider 14 frequency. The system also includes on the transmission side elements 15 and 16 unilateral conduct is STI, additional multipliers 17 and at the receiving side elements 18 and 19 unilateral conductivity, additional multipliers 20. The keys contain the inverter 21, the multipliers 22 and 23, an adder 24.

The system of discrete information transmission works as follows. The outputs of the sources of information you may receive discrete information in the form of "0" or "1". The duration of zero or one the same length as the channel vector received at a control input of multiplier 2, the information input of which is connected to the output of the corresponding source I information.

The clock generator 4 generates a pulse, the duration of which is equal to the half period of the frequency received at the clock input of the generator 5 of the Walsh function, the outputs of which form 2nof the Walsh function. The pulses from the output of the clock generator 4 receives at the input of the divider 7 frequency having a division ratio of 2n-1. Thus, during the first half period of the formation of the Walsh function at the output of the divider 7 frequency of "0"is received at control inputs of the keys 6. During the second half period of the formation of the Walsh function at the output of the divider 7 frequency formed "1"is received at control inputs of the keys 6.

When it arrives at the control input key 6 to "0" at its output, a signal is generated from the first information is information input, and when it arrives at the control input key 6 "1" at its output, a signal is generated from the second information input.

Let us consider the operation keys 6 (see figure 2).

When it arrives at the control input z key 6 to "0"to the input element 21 and the first input of the second multiplier 23 receives "0". As a result, the signal of the first information input x1key 6, through the multiplier 22 and the adder 24 is supplied to the output. The signal supplied to the second information input x2not output, because at the first input of the multiplier 23 receives "0" from the control input z.

When it arrives at the control input z key 6 "1"on the input element 21 and the first input of the multiplier 23 receives "1". As a result, the signal supplied to the second information input x2key 6, through the multiplier 23 and the adder 24 is supplied to output the key 6. The signal of the first information input x2key 6, no output, because at the first input of the multiplier 22 receives "0" from the output element 21.

Thus, the signal S(i,θ) at the output of each of the key 6 has the form of two linked half-periods of the respective functions of Walsh. The signals from the outputs of the keys 6 are received at the first inputs of the respective additional multipliers 17. On the second inputs of the multipliers 17, having the sequence number is 1 to 2 n-1th receives a positive pulse from the output element of unilateral conductivity, which passes only pulses having a polarity "+", 2nth output of the generator 5 of the Walsh function. On the second inputs of the additional multipliers 17 having sequence numbers from (2n-1+1)-th to the 2nth receives a negative pulse from the output element of unilateral conductivity, which passes only pulses having a polarity "-", 2nth output of the generator 5 of the Walsh function. As a result, the additional outputs of the multipliers 17 is formed 2nvector control channel information, the duration of each of which is equal to the duration T of the Walsh function, and pulse duration of Δt generated by vectors of equal pulse duration Δt vectors generated by the prototype at the same frequency of the clock generator 4.

The orthogonality of all 2nthe generated carriers can verify by multiplying any of them, and integrating the product over time, So

On the second inputs of the multipliers 2 do so transmit channel information, which are multiplied in them to "1" or "0" depending on what is fed to the first input of the corresponding multiplier is 2, then the results of multiplication through the adder 3 are received in the communication line.

On receiving the side group signal is sent to the information inputs of the multipliers 8, on the second inputs of the multipliers 8 at this time receives reference signals from outputs of the respective additional multipliers 20, which are formed as the vector channel information at the transmitter side. In the multiplier 8 is the multiplication group of signals to the respective reference signals, and the results for the duration of the transmit channel information are integrated in the respective integrators 11. The outputs of the integrators 11 is formed adopted discrete information received at the inputs of the receivers 12 information.

Figure 3 shows timing diagrams illustrating the process of forming the channel vector S'(6,θ) in the eight-channel system, discrete information transmission in the case of "1" from the output of the source 1 to the information input of the corresponding multiplier 2. The graphs depict a temporary condition:

a) the output of the clock generator 4;

b) the seventh output of the generator 5 of the Walsh function, which is formed by the function Wal(6,θ)arriving at the first input of the seventh key 6;

b) a second generator output 5 of the Walsh function, which is formed by the function Wal(1,θ)supplied to the second information input of the seventh key 6;

g) output of the divider 7 frequency;

d) output of the seventh key 6, which is formed by the signal S(6,θ);

e) 2nth output of the generator 5 of the Walsh function, which formed the function Wal(7,θ), arriving at the inputs of the elements 15 and 16 unilateral conductivity;

W) the output element 16 unilateral conductivity, transmissive negative pulses;

C) output of the seventh additional multiplier 17, which is formed by the signal S'(6,θ);

and output of the seventh source 1 information;

K) the output of the seventh unit 2 multiplication, which is formed by the channel vector S'(6,θ).

It is known that the channel vectors generated in the transmission system, it is necessary to provide the bandwidth required for transmission of the wideband channel vector (see Varakin LE systems Theory signals. - M.: Soviet radio, 1978, page 11). The more blocks the signal, the more effective width of the signal spectrum Wμeff.(see Varakin LE systems Theory signals M: Soviet radio, 1978, s). When this block is a sequence of elements having a phase of 0 or πthen there is a sequence of positive or negative elements of the signal (see Varakin LE systems Theory signals. - M.: Soviet radio, 1978, s, first row).

In similar (see the Federal Republic of Germany patent No. 1959175, CL H 04 J 11/00, 1976) used channel vectors described by Walsh functions and with the number of blocks μ=1,2,3,...,N, where N is the number of the element is in the Walsh functions (see figure 4).

Therefore, the channel vectors generated by similar, have different effective width of the spectrum, with the largest effective width of the channel has a vector whose number of blocks μ=2n=N (meander):

where Δt - duration element signal (see Varakin LE systems Theory signals. - M.: Soviet radio, 1978, C, table 11, 1, second line).

In the prototype (see RF patent №2025901 on application No. 4844150/09 (069146) from 25.06.90, CL H 04 J 11/00) are the vectors of channel information representing signals having the number of blocks (see figure 5):

The effective spectral width of the broadband carrier used in the prototype, taking into accountthat is determined by the formula

(see Varakin LE systems Theory signals. - M.: Soviet radio, 1978, s equation (11.11)).

In the proposed system of discrete information transmission all vectors have the same number of blocks (see Fig.6):

and the maximum effective width of the spectrum vector is determined from the relation (3) subject to.

The table presents the results of calculations of the effective width range Wμe is f most broadband carriers used by the analogue prototype and the proposed system for the transmission of discrete information for a different number of channels.

Table
Channel vectorsEffective width range Wμefffor the number of channels, k
48163264
Generated by analog10,58321,90944,5489,8180,31
Generated by the prototype8,9416,9732,9964,99128,99
Generated by the proposed transmission system7,48315,49131,49663,498127,499

According to the results table, we can conclude that the gain in the frequency band required for the proposed transmission system, in comparison with the similar is 29,29% for any number of channels k. Compared with the prototype of the winning is 16, 33% for k=4; 8,71% for k=8; 4,51% for k=16 and so on

The use of the invention can significantly reduce the bandwidth required to ensure that the system is discrete transfer the information.

The system of discrete information transmission with the transmitting-side information sources, multipliers, an adder, a clock generator, function generator Walsh, 2nkeys (where 2n- number of outputs of the function generator Walsh) and the frequency divider, and outputs information sources connected with the first inputs of the multipliers, the outputs of which are connected with inputs of the adder, the output of which is connected to the communication line, the output of the clock generator is connected to the input of the function generator Walsh and to the input of the frequency divider, the output of the frequency divider is connected to control inputs of keys, the first information input of each of the i-th (where i=1,...,2nthe key is connected to the i-th generator output of the Walsh function, the second information input of each of the i-th key is connected to (2n-1-i)-th generator output of the Walsh function, and at the receiving side the oscillator, function generator Walsh, multipliers, integrators, receivers of information, 2nkeys and the frequency divider, and the output of the clock generator is connected to the input of the function generator Walsh, the first inputs of the multipliers are connected to the communication line, the outputs of the multipliers are connected to the inputs of the integrators, the outputs are connected to the inputs of the receivers of the information, the output of the clock generator is connected to the input of the frequency divider, the output of which is connected to the control in which the od of the keys, the first information input of each key is connected to the i-th generator output of the Walsh function, the second information input of each key is connected to (2n+1-i)-th output of the function generator Walsh, characterized in that, in order to reduce bandwidth by reducing the effective width of the spectrum of channel vectors, it introduced on the transmission side two elements unilateral conductivity and 2nadditional multipliers, and the output of each key is connected to the first input of the corresponding additional multiplier, the output of which is connected to the second input of the corresponding multiplier, 2nthe first output of the function generator Walsh connected to the inputs of the elements unilateral conduction, the output of the first element unilateral conductivity is connected with the second inputs of the k-x additional multipliers (where k=1,...,2n-1), the output of the second element unilateral conductivity is connected with the second inputs l-x extra multipliers (where l=2n-1+1,...,2n), and at the receiving side two element unilateral conductivity and 2nadditional multipliers, and the output of each key is connected to the first input of the corresponding additional multiplier, the output of which is connected to the second input of the corresponding multiplier, 2nthe first generator output of the Walsh function is connected to the input of the elements unilateral conductivity, the output of the first element unilateral conductivity is connected with the second inputs of the k-x additional multipliers (where k=1,...,2n-1), the output of the second element unilateral conductivity is connected with the second inputs l-x extra multipliers (where l=2n-1+1,...,2n).



 

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