Method for transferring information in communication system with noise-like signals

FIELD: radio engineering, possible use in communication systems with noise-like signals.

SUBSTANCE: in accordance to method, digital data, received from the source of information on time span [(n-1)T,nT], where T - period of pseudo-random series, n=0,1,2..., during transfer is transformed to shift of pseudo-random series, generated on time span [nT,(n+1)T], and during receipt, value of shift of pseudo-random series of received signal relatively to pseudo-random series of previously received signal is determined, value of shift is transformed to digital data of received information.

EFFECT: increased speed of information transfer along communication channel.

3 cl, 5 dwg

 

The invention relates to the field of radio and may find application in communication systems with noise-like signals.

The main task you have to solve in the design of communication systems is the choice of signals, modulation and coding, which will allow you to get the maximum noise immunity and to ensure a high data transmission rate in the communication channel.

Known methods of information transmission in communication systems with noise-like signals that are implemented in the following patents:

Patent No. 2085046, "a System for the transmission of discrete information, the patent owner joint-stock company "BSD/SILICONE", 1997.07.20.

Patent No. 2219660 Line, "radio", the patentee FSUE VNIIS, the authors Zapletin J.V. and others;

The book "Pseudonoise signals in communication systems", edited by V.B. have been Pestryakova. M: Owls. Radio, 1973.

The book "Broadband system" author Dixon R.K. - M.: Communication, 1979, s-209.

Known communication systems using pseudonoise signals obtained by phase manipulation signal of the carrier frequency pseudo-random sequence. In data communication systems each bit of transmitted information is encoded pseudo-random sequence that allows to provide high noise immunity.

It is known that the larger the base signal or length is and the used pseudo-random sequence, the higher the noise immunity of the communication system. However, having a high immunity to electromagnetic interference, such systems will have a low data transmission rate, that is their fault.

The closest in technical essence and essential features of the claimed method of transmitting information in a communication system with noise-like signals is the data transmission method described in the book "communication Systems with noise-like signals" author LE Varakin. - M.: Radio and communication, 1985, p.16-18.

There is a method of transmitting information includes the formation of signals (oscillations) of the carrier and clock frequencies. From the clock generate a pseudo-random sequence (SRP), produce phase shift keying binary sequence of pulses from a source of information. During phase manipulation, depending on what you pass in: 1 or 0, the pulses of the source of information replace direct or inverse pseudo-random sequence. The carrier signal is manipulated in phase (0, 180) pseudo-random sequence of pulses, progenipoietin phase from a source of information. Formed at the carrier frequency signal to amplify and radiate over the communication channel. In the receiver the signal is transferred to an intermediate frequency, amplify and about srabatyvayut agreed by the filter. Then, search, synchronization, and phase-lock loop on the carrier frequency. After search and synchronization of the output signal of the matched filter information form a sequence of binary pulses, which are passed to the receiver of the information.

The known method of transmission of information, the sequence of pulses from a source of information, performs phase shift keying pseudo-random sequence. Each bit of transmitted information is replaced by the direct or inverse pseudo-random sequence. For a time interval equal to the period of the pseudorandom sequence, it is possible to transmit only one bit of information.

The disadvantage of this method is the low data transmission rate, which is R=1/T bits/s (where T is the period of the SRP).

The inventive method of transmitting information in a communication system with noise-like signals allows to increase the speed of information transmission over the communication channel.

This is achieved due to the fact that in the data transmission method in a communication system with noise-like signals to form signals the carrier and clock frequencies. From the clock generate a pseudo-random sequence, which is manipulated in phase from an information source, and the carrier signal frequency manipulate the phase of pcev sluchainoi sequence, which progenipoietin phase from a source of information. Formed at the carrier frequency signal to amplify and radiate over the communication channel. In the receiver input signal amplify, transform, frequency, form the signal clock frequency, which form a pseudo-random sequence. Then synchronize the generated pseudo-random sequence with the input signal and produce information.

Due to the fact that on the transmission side digital data received from an information source for a time interval equal to the period of the pseudorandom sequence, one-to-one transform in the shift elements of the generated pseudo-random sequence with respect to the elements previously generated pseudo-random sequence, and at the receiving side determines the magnitude of this shift and transform it into digital data of the received information, you receive the possibility of creating an additional channel of information transfer.

The technical result consists in increasing the speed of information transmission in communication systems with noise-like signals by creating an additional channel of communication, allowing for a time equal to the period of the pseudorandom sequence, to increase the speed of transfer of information in the log2N+1 times (where N is the number of elements is s SRP). If we choose N=2nyou will get a speed increase in log22n+1=n+1 times.

Consider the case where the transmitter during the formation of a pseudo-random sequence time interval [nT, (n+1)T] (where n=0, 1, 2, ...; T is the period of the SRP) as a reference sequence use the sequence generated in the previous time interval [(n-1)T, nT]. In accordance with the inventive method of transmitting information in a communication system with noise-like signals, the digital data received from the source of information on the time interval [(n-1)T, nT], will be converted to a shift of the pseudo-random sequence at the site [nT, (n+1)T] relative to the pseudo-random sequence on the time interval [(n-1)T, nT].

Figure 1 shows a time chart explaining the shift of the SRP (for sequences consisting of eight elements, which are indicated by numbers 1, 2, ..., 7, 8), the corresponding digital data.

Figure 2 shows the results of lattice calculations of the cross-correlation function R(n) in the receiver for pseudo-random sequences, consisting of eight elements. Letters M0, M1, M2, M3the indicated values of n elements, in which the correlation function R(n) on the intervals [0, T], [T, 2T], [2T, 3T], [3T, 4T] takes the maximum or minimum (shown dotted) value is.

On the transmission side digital data received from an information source on the time interval [(n-1)T, nT], is converted into a cyclic shift of a generated sequence on the time interval [nT, (n+1)T)]. Assume that the time intervals [0, T], [T, 2T], [2T, 3T] from the source of the information submitted the following digital data (CSD): 3.6 and 0, respectively (see figure 1). To pass the number 3 in accordance with the inventive method of transmitting information in a communication system with noise-like signals, pseudo-random sequence on the time interval [T, 2T] cyclically shift on three element relative to a pseudorandom sequence (SRP) on the time interval [0, T]. After the cyclic shift on the time interval [T, 2T] SRP will begin with a 6 element and end with the 5th element. To transmit the number 6, received from an information source on the time interval [T, 2T], a pseudo-random sequence time interval [2T, 3T] cyclically shift 6 items relative to the sequence on the time interval [T, 2T]. After the cyclic shift on the time interval [2T, 3T] SRP will start from 8th and end the 7th element. To transmit 0 received from the information source in the time interval [2T, 3T], a pseudo-random sequence time interval [3T, 4T] is not moved.

If pseudo is Lucina sequence consists of eight elements, then for a time equal to the period of the SRP, you can pass one of the eight numbers 0, 1, ..., 6, 7, which corresponds to the transmission log28=3 bits of information. In the General case, when the sequence has N elements, for a time equal to the period of the SRP, you can send log2N bits of information. If N=2n(n∈N is the set of natural numbers), then for the period of the pseudorandom sequence, you can send log22n=n additional bits of information.

On the transmission side is formed sequence manipulates the phase of the carrier signal, which amplify a power amplifier and transmitted over the communication channel.

In the receiver the signal is amplified and converted by the frequency. Then calculate the cross-correlation function of the received signal with a pseudo-random sequence generated in the receiver. After comparing the maximum of the correlation function with a preset threshold, the decision about the detection signal and the receiving device is switched on, the system phase-locked loop for carrier and clock frequency.

In the selection mode information through each time interval equal to the period of the pseudorandom sequence (T), calculates the cross-correlation function R(n) (where n=0, 1, 2, ...) of the input signal with a pseudorandom sequence of the receiver (see figure 2). To calculate the function is zaimei correlation in real time, you can use the fast convolution algorithm, for example, as described in the book "Theory and application of digital signal processing", authors L. Rabiner, B. Gould. - M.: Mir, 1978, s-693.

After computing the cross-correlation functions R(n) on each time interval [nT, (n+1)T] is the position of the absolute maximum of Mn. The sign of the correlation function at the point the absolute maximum is determined by the binary sequence, manipulating the phase of the pseudorandom sequence in the transmitter, depending on which sequence can be direct or inverse. The offset of the absolute maximum of the correlation functions is dependent on the amount of cyclic shift, which, in turn, depends on the digital data received from the information source. To convert the shift of the maximum of the correlation function in the digital data CD of the received information, the equation

where N is the number of elements in the period of the pseudorandom sequence;

Dndigital data.

For the correlation functions shown in figure 2, by the formula (1) we get D1=3, D2=6, D3=0. The sign of the correlation function determines the binary pulse sequence. If the sign (sign) of the correlation function has changed signR(M(n+1))≠signR(Mn), adopted by the unit, if not changed, sign(M(n+1))=signR(Mn), adopted zero.

Currently in EMEA find wide application of multi-channel communication system time division channels. Therefore, we consider the application of the proposed method of information transmission with noise-like signals in a communication system time division channels.

Figure 3 shows the timing diagram of distribution channels.

Figure 4 shows the structure of the signal caller.

Figure 5 shows the results of computing the cross-correlation functions in the receiving device of a subscriber of a communication system time division channels.

As shown in figure 3, each subscriber multichannel communication system periodically, at intervals of time which are called frame duration (TCR), is allocated to the time channel (ΔtKahn) for information transfer. So as not to create interference, temporary channels between a split protective intervals (ΔtPro).

The signal caller (figure 4) multi-channel communication system time division channels formed in its allocated time channel. The signal consists of two main parts. The first part, which we call the preamble, is intended only for synchronization. The preamble is formed by phase shift keying signal of the carrier frequency pseudo-random sequence. The duration of the preamble is 0.5-2% of the total signal duration and contains one or two periods a pseudo-random sequence. After the preamble, the information is the main part of the signal, which contains k periods of the pseudo-random sequence (blocks). On the transmission side digital data received from the first information source, is converted into a circular shift of the elements of the generated pseudo-random sequence relative to the SRP contained in the preamble. The information bits received from the second source of information, manipulating the phase of the SRP in the information part of the signal relative to the SRP of the preamble. When using SRP, consisting of 8 elements for transmission of numbers, such as 4, 2 and 6, a pseudo-random sequence contained in the 1st, 2nd and 3rd blocks cyclically shift respectively 4, 2 and 6 elements with respect to the SRP preamble (see figure 4). The resulting signal is manipulated by the phase of the carrier signal, amplify it and transmit over the communication channel in the selected temporary channel.

In the receiver the signal amplify, transform, frequency and form of the SRP in accordance with SRP in the transmitter. Thus formed a pseudo-random sequence is synchronized with the preamble of the received signal, then include a system phase-locked loop for carrier and clock frequency. Calculate the cross-correlation function of the SRP, formed in the receiving device with pseudo-random sequences contained in the block of the Ah information part of the signal.

Figure 5 shows the results of computing the cross-correlation functions for an eight-element pseudo-random sequences.

Item number absolute maximum of the correlation function determines adopted digital information in the form of numbers: 4, 2 and 6 from the first source. The sign of the correlation functions at points corresponding to the maximum absolute values, determines the bits of information received via communication channel from the second source.

Thus, due to the fact that on the transmission side digital data coming from the source of information, one-to-one transform in the shift elements of the generated pseudo-random sequence with respect to the elements previously formed SRP-selected time interval equal to the period of the SRP, and at the receiving side determines the amount of shift of the received pseudo-random sequence relative to the previously adopted and convert it into digital data of the received information, you receive the possibility of creating an additional channel of information transmission, which increases the speed of information transmission in communication systems with noise-like signals (PSS).

The increase in the speed of information transmission in communication systems with noise-like signals is achieved at the expense of additional communication channel, allowing for a time equal to the period of the random effects is successive, to increase the speed of transfer of information in the log2N+1 times (where N is the number of elements of the SRP). If we choose N=2nyou will get a speed increase in log22n+1=n+1 times.

1. The data transmission method in a communication system with noise-like signals, according to which the digital data received from the source of information on the time interval [(n-1)T, nT], where T is the period of the pseudorandom sequence (SRP), n=0, 1, 2..., when the transmission is converted into a shift SRP generated in the time interval

[nT, (n+1)T], and the reception determining the magnitude of the shift of the SRP received signal relative to the SRP previously received signal, the shift value is converted into digital data of the received information.

2. The method according to claim 1, characterized in that the SRP is shifted cyclically.

3. The method according to claim 1, wherein the shift value of the SRP determined by the shift of the maxima of cross-correlation functions of the SRP received signal and the SRP receiver.



 

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