Method of transmitting and receiving information with a code multiplexing of signals

 

(57) Abstract:

Usage: in the technique of discrete information transmission, in the transmission systems of discrete data with a code multiplexing of signals. The essence of the invention: method for transmitting information with a code multiplexing of signals forming the i-th (where i=1, ..., N) orthogonal combinations on the transmission side is performed by the delay (i-1) initial code combination (where t is the duration element combination), no lateral emissions in the aperiodic autocorrelation function (ACF), with the i-th modulation information sequence (where i=1,....N) is delayed by (i-1). Therefore, at the receiving side when receiving each information element is only defined by the ACF of the same code combination, which facilitates the reception of information and due to the formation of orthogonal combinations by shift cycles copies of the same source code, is not required cycle synchronization, which increases the accuracy of the data reception. 5 Il.

The invention relates to techniques for transmitting digital data and can be used in the transmission systems of discrete data with a code multiplexing of signals.

There is a method of speaking side of the original information sequence is divided into parallel information sequences, execute their code seal group signal is passed through the communication channel at the receiving side, performing the parallel operation of acceptance by the number of condensed sequences and add them to the original information sequence. The disadvantage of this method is the difficulty of receiving a group of signal due to the large number of parallel operations when selecting an information sequence and the low accuracy of reception due to the requirement to maintain frame synchronization.

The closest technical solution, selected as a prototype, is a method of transmitting information with a code multiplexing of signals, which are arranged in N parallel orthogonal address combinations that modulate relevant information sequences obtained, for example, by dividing the original information sequence, combine, for example, summarize the modulated combination group signal, and transmitted through the communication channel at the receiving side, where do N parallel operations of the correlation group receiving signal and produce the original information sequence.

The disadvantage of the correlation operations of receiving a group signal. In addition, at the receiving side must perform cyclic synchronization specifying the start address combinations, which reduces the accuracy of the data reception.

The aim of the invention is to simplify the receipt of the information by reducing N times the number of operations of the correlation reception while improving the accuracy of reception of the information by excluding frame synchronization.

This goal is achieved by the fact that in the data transmission method with the code multiplexing of signals, comprising a transmitting side of the formation of N orthogonal combinations, modulation of their respective modulating information sequences, obtained by dividing the original information sequence, summing the modulated combinations in group signal and transmission over the communication channel to the receiving side, where is the correlation receive multicast signal and the allocation of the original information sequence according to the invention the formation of the i-th (where i= 1, ...,N) orthogonal combinations on the transmission side is performed by the delay (i-1) the source code combinations (where the length of the element combination), no lateral emission up the..,N) is delayed by (i-1) .

Comparative analysis of the proposed solutions with the prototype shows that the inventive method differs from the known fact that the formation of the i-th (where i= 1, ...,N) orthogonal combinations on the transmission side is performed by the delay (i-1) elements of the same source code combinations that do not have lateral emissions in the aperiodic autocorrelation function (ACF), i.e. this code combination is orthogonal to itself at any clock shift 0. Thus the i-th modulation information sequence (where i= 1, ...,N) is delayed by (i-1) elements of the code combination. Thus, each information element in all N modulating information sequences modulates the same code combination, but due to the fact that the information elements in the i-th modulation sequence shifted by (i-1) elements of the combination, all modulated code combination when adding to the group signal are orthogonal. Therefore, at the receiving side when receiving each information element is only defined by the ACF of the same code combination. In the method prototype at the receiving side was required to determine the ACF corresponding code combination, and in other ooperati correlation of receive N times, making it easier to receive information. In the method prototype orthogonal combination was modelirovanie parallel to the N information elements. Because the code combinations are orthogonal only in point, at the receiving side need to know the moment of appearance in the group signal the beginning of the next stack of N modulated orthogonal combinations, i.e., the required cycle synchronization. In the present method of orthogonal combinations are shifted by cycles copies of a single original combination, therefore, determine its origin is not required, because at any clock time will be the beginning of another modulated code combination. Thus, cycle synchronization is not required, which improves the accuracy of the receipt of the information.

These differences allow to draw a conclusion on the conformity of the proposed technical solution the criterion of "novelty".

The features distinguishing the claimed technical solution to the prototype, not identified in other technical solutions in the study of this and related areas of technology, and therefore provide the inventive solution according to the criterion of "significant differences".

The proposed method is illustrated using the system is as shaper of modulating an information sequence; in Fig. 3 is a block diagram of the modulator of Fig. 4 - plot of stresses, explaining the operation of the device of Fig. 5 is a block diagram of the correlator.

The transmission system includes a transmitting side of the generator 1 clock pulse shaper 2 initial code combination, a delay line 3 multidrop, shaper 4 baseband information sequences, N modulators 5, an adder 6, which is connected through the communication channel 7 reception party, which has agreed a filter 8 and a crucial block 9. Moreover, the imaging unit 4 baseband information sequence contains the count of 10 binary decoders 11, 12, and ND-trigger 13, the modulator 5 includes an inverter 14 and a managed switch 15. On the transmission side of the communication system (Fig. 1) the output of the generator 1 clock pulses connected to the input of the shaper 2 initial code combination and the second input of the shaper 4 baseband information sequences, the first input and the outputs of which respectively is input to the transmission system and connected with the first inputs of the respective modulators 5, second inputs and outputs are connected to respective outputs of the delay line 3 multidrop shaper's output 2 source code combinations. At the receiving side to the output of the channel 7 is connected in series United agreed a filter 8 and a deciding unit 9 whose output is the output of the system of information transmission. The second input of the shaper 4 modulating sequences (Fig. 2) is the input of the counter 10, the outputs of which are connected to corresponding address inputs of the decoders 11 and 12, the outputs of which are connected respectively with the information and the counting inputs of the respective D-flip-flops 13, the outputs of which are the respective outputs of the shaper 4 modulating sequences, the input resolution sampling of the decoder 11 is the first input of the shaper 4. The first input of the modulator 5 (Fig. 3) is a control input of the switch 15, the first and second signal inputs of which respectively is the second input of the modulator 5 and is connected to the output of the inverter 14, an input connected to the second input of the modulator 5, the output of the switch 15 is the output of the modulator 5.

The communication system operates as follows.

On the transmission side of the receipt of the original information sequence is performed synchronously with the operation of the clock generator 1 implie 24 of the item shown on the plot of Fig. 4, b. Shaper 4 baseband information sequence divides the original information sequence at the N modulating sequences, the following shift on the beat (for N=8 Fig. 4,,... k). Moreover, the duration of each information item is increased N times.

In the imaging unit 2 to clock pulses generated source code combination that does not have lateral emissions in aperiodic ACF, for example, Quaternary-encoded sequence (E-code). The device forming the Quaternary-coded sequences are known. As the following example shows the source of the Quaternary-coded combination:

, (Fig. 4, l) where = -; = - , and the elements and orthogonal . This can be, for example, radio frequency photomanipulation the sequence in which the initial phase elements take the values:

= 0; =; = ; = . In the i-th tap of the delay line 3, the source code combination appears delayed by (i-1) (where is the length of the element combination). Thereby, the ensemble of orthogonal code sequences received at the second inputs of the respective modulators 5. For the considered example, the outputs of the modulators 5 b is odulator 5 operates according to the following rule:

< / BR>
< / BR>
Group signal at the output of the adder 6 is shown in Fig. 4, f. This simultaneous transmission of orthogonal signals (, ) and ( , ) is shown by placing them on different sides of the x-axis.

After passing through the communication channel 7, group signal at the input is consistent with the initial code combination filter 8, the output of which is formed by the sequence of the main peaks of the ACF of the original code combination, the sign of which includes the information transmitted (Fig. 4, x). The decision to transfer information items are accepted in the final block 9.

Shaper 4 baseband information sequences shown in Fig. 2. Information elements are sent to the input resolution sampling decoder 11 synchronously with a clock pulse at the input of counter 10. However, in accordance with a binary number at the outputs of the counter 10 with the corresponding output of the decoder 12 receives a pulse to the counting input of the corresponding D-flip-flop 13. Because of its informational input connected to the corresponding output of the decoder 11, the logical "1" is recorded in it only when a logical "1" at the input resolution sampling of the decoder 11. If the input resolution is 11 will be banned and its all outputs will be zero. Thus, at the outputs of the triggers 13 are formed modulating an information sequence (Fig. 4, in,...,K).

The modulator 5 is shown in Fig. 3. Under the action of a logical "1" at the control input of the switch 15 connects its output to its first signal input, and under the influence of logical "0" to the second signal input to which is supplied the inverted signal from the inverter 14. Consistent filter 8 for receiving the phase-shift keyed Quaternary-coded sequences can be made of the delay elements on surface acoustic waves. Crucial unit 9 in the simplest case is a threshold element. Instead of the matched filter 8, you can use the correlator, an example of which is shown in Fig. 5. It consists of a multiplier 16, filter 17 of the lower frequencies and shaper 18 reference signal, which contains the generator 19 clock, driver E-codes 21, the delay line 22 multidrop, and the adder 20. Moreover, the input of the correlator 8 is the first input of the multiplier 16, the second input and the output of which is connected respectively with the output of the shaper 18 reference signal and the input of the filter 17 of the lower frequencies, the output of which is the output of the correlator, f is s delay 22 multidrop, the outputs of which are connected to the corresponding inputs of the adder 20, the output of which is the output of the shaper 8 reference signal. Such a correlator subject of synchronization with the received multicast signal produces a convolution of all elements of the group signal in the sequence of the main peaks in the ACF modulated source code combinations, the sign of which includes the information transmitted. I.e. the result of the operation of the correlator clock in moments similar to the result of the matched filter 8.

Thus, the use of the proposed method in the transmission systems of discrete data, where for the purpose of protection from impulse noise is the code multiplexing of signals, will simplify the group receiving the signal by reducing N times the number of operations of the correlation technique. This became possible due to the formation of an ensemble of orthogonal code combinations by shifting one of the original combination, without lateral emissions in aperiodic ACF. In addition, a uniform shift code combinations in which at each clock time starts to be transmitted next code combination, the modulated information element, allows to exclude CA INFORMATION WITH a CODE multiplexing of SIGNALS, namely, that form the N orthogonal sequences that modulate the corresponding information sequence generated by dividing the original information sequence, summarize the modulated combination group signal and transmitted over the communication channel, and at the receiving side perform correlation receive multicast signal and the allocation of the original information sequence, characterized in that, to facilitate the receipt of the information by reducing N times the number of operations of the correlation reception while improving the accuracy of admission by exception frame synchronization, the transmitting side of each i-th orthogonal combination is formed by delaying the (i-1) the original orthogonal code combinations that do not have lateral emissions in the aperiodic autocorrelation function, and the corresponding i-th modulation information sequence is also delayed by (i-1) , where i = 1, 2, 3, ... , N, is the length element of the original orthogonal code combination.

 

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