A way of taking complex phase-shift keyed signals against narrowband interference and device for its implementation

 

The invention relates to the field of radio and can be used in immune systems with complex photomanipulating signals (SFMS). The technical result - increased robustness against the background of narrowband interference. The method SFMS is rejectee portions of the spectrum of the signal impressed narrowband interference removing manipulative pseudo-random sequence and subsequent demodulation of the received signal, and the signal processing are in two stages, the useful signal to form a sequence of coherent radio pulses with a spectrum consisting of several spectral lines, the spectrum is converted into a narrow-band interference range, hitting two spectral lines of the useful signal and the correlation signal processing takes place simultaneously with the rejection of interfering spectrum by eliminating the corresponding harmonic components of the reference radiopulse signal. The device for implementing the inventive method SFMS provides suppression of narrowband interference without the use of not distorting the signal dies large number of complex, mutually agreed bandpass filters. To solve this problem in ustroili filter, the demodulator, and the control unit and the adder inputs of the Q multiplier products, Q delay elements, Q shapers signals, switch the unit key and the grid generator frequency. 2 N. p. F.-ly, 6 ill.

The present invention relates to the field of radio and can be used in immune systems with complex photomanipulating signals (SFMS).

There are two basic methods for increasing immunity of receivers SFMS when narrowband (UE) noise [Varakin L. E. communication Systems with noise-like signals. - M.: Radio and communication, 1985, page 26; the Address, control and communications systems. Optimization issues./Ed. by G. I. Tuzov. - M.: Radio and communication, 1993, pp. 254-267]: compensation and method of alignment ("oblivanie") spectrum.

When the compensation method of the input mixture signal and interference is subtracted formed in the receiver a copy of interference. In a nonstationary environment, the formation of copies with sufficient accuracy is difficult, therefore, the compensation of interference is obtained incomplete.

Alignment ("oblivanie") spectrum of the input mixture signal-to-noise ratio is the so-called blocks protection ("whitening filter"), engaged in the notch new filters with adjacent amplitude-frequency characteristics (AFC), moreover, such a comb with all the filters should not distort SFMS [Address, control and communications systems. Optimization issues/Ed. by G. I. Tuzov. - M.: Radio and communication, 1993, Fig.13.3 p 254]. Therefore, the protection blocks are complex and expensive devices, the use of which is limited. For example, according to the mobile communication standard IS-95 block protection against narrowband interference is not applied even in base stations, not to mention mobile. As a result, as practice shows, even one narrowband interference can cause communication breakdown.

Closest to the proposed method SFMS on the background of the narrowband interference is a method of correlation reception rejection of narrowband interference at the input of the correlator described in the book [the Address, control and communications systems. Optimization issues/Ed. by G. I. Tuzov - M.: Radio and communication, 1993, pp. 256-257], adopted for the prototype.

Prototype method is rejectee portions of the spectrum of the signal impressed narrowband interference removing manipulative pseudo-random sequence (SRP) and subsequent demodulation of the received signal.

The disadvantage of this method is the technical complexity of the implementation of rejectio portions of the spectrum of sigw rejectee portions of the spectrum signal, affected narrowband interference, removing, manipulating the SRP and subsequent demodulation of the received signal, according to the invention the signal processing are in two stages, the first stage in the removal of SRP to form the useful signal in the form of a sequence of coherent radio pulses with a spectrum consisting of several spectral lines by the number of3, the spectrum of the narrowband interference transform in range, hitting two spectral lines of the useful signal, at the second stage, the correlation signal processing with simultaneous rejection of interfering spectrum by eliminating the corresponding harmonic components of the reference radiopulse signal.

Graphic materials presented in the application

Fig.1 is a functional diagram of the device of the prototype.

Fig.2 is a functional diagram of the device.

Fig.3 is a plot of signals in different points of the circuit of the proposed device.

Fig.4 - conversion spectra of signal and noise in well-known

and the proposed devices.

Fig.5 is a functional diagram of the generator to the grid frequency.

Fig.6 is a block diagram of the control unit.

Functional diagram of the device adopted for optimizatsii/edited G. I. Tuzov. - M.: Radio and communication, 1993, page 257] and shown in Fig.1, where indicated:

1 - unit protection against narrowband interference;

2 - correlator;

31..3ncomb bandpass filters;

41...4n- controlled attenuators;

5 - control unit;

6 - adder;

7 - multiplier;

8 - generator SRP;

9 - narrowband filter;

10 is a block synchronization;

11 - demodulator.

The device prototype contains serially connected unit protection against narrowband interference 1, correlator 2 and the demodulator 11, and the input device, which is the input of the protection unit 1 is connected to the inputs of n parallel connected band-pass filters 3, the outputs of which are connected to signal inputs of the respective n controlled attenuators 4 and control unit 5, the n outputs of which are connected to control inputs of the respective n attenuators 4, the outputs of which are connected with inputs of the adder 6, the output of which is the output of the protection unit 1 and is connected to the signal input of the multiplier 7, which is the input of the correlator 2. The reference input of the multiplier 7 is connected to the output of the generator SRP 8, the input connected to the output of the synchronization unit 10, and the output of the multiplier 7 - through Skopelos is by the output device.

Function prototype as follows.

The input mixture SFMS and narrowband interference is fed to the input of the comb bandpass filters 31...3nwith attached response. The output of each filter is fed to the control unit 5 and the corresponding controlled attenuator 4, the transmission coefficient which is inversely proportional to the interference power at the output of the corresponding filter. Control attenuators 4 signals produced in the control unit 5 on the basis of the analysis of the levels of the signals from the outputs of all filters 3 combs. Attenuators 4 can operate in key mode: the channels of the protection unit 1 is open at low interference levels and closed at large. As a result, the output of the adder 6 is formed input SFMS, but with registrovani areas of the spectrum that were affected narrowband interference. In the multiplier 7 is removed from SFMS manipulating the SRP in its coincidence with the SRP produced by the generator 8. The coincidence of the SRP is provided by the synchronization unit 10. Only manipulation caused by the information signal. The output of the narrowband filter 9 has a band corresponding to the band of the information signal, which is produced at the output of the demodulator 11.

The objective of the invention is the provision of suppressing one or more narrowband interference in systems that use complex photomanipulation signals, without the use of dies of bandpass filters.

To solve this problem in the device that contains the multiplier, connected in series to the synchronization unit and the generator SRP, connected in series narrowband filter and the demodulator, and the control unit and the adder, according to the invention additionally connected in series Q multiplier products and Q of the delay elements, and Q shapers signals, switch the unit key and the grid generator frequency, and signal inputs the Q multiplier products are combined and input device, the Q outputs of delay elements connected to respective Q inputs of the adder, the output of which through (Q+1)-th multiplier connected to the input narrow-band filter, and the output of the demodulator is an output device. The generator output SRP connected to the switch input, the Q outputs of which are connected to respective inputs Q shapers signals, the outputs of which are connected with the control inputs of the respective Q multiplier products, the second output unit sinhronnyj (2Q-1) inputs of the block of keys and (2Q-1)inputs of the control unit, thus the outputs of the control unit is connected to (2Q-1) control inputs of the block of keys, in addition, the output of the adder is connected to 2Q-m input control unit, and the output of block keys - reference input (Q+1)-th multiplier.

Functional diagram of the device shown in Fig.2, where indicated:

11...1Q+1the multiplier products;

21...2Qelements of the delay;

31..3Q- shapers signals;

4 - switch;

5 - generator SRP;

6 - adder;

7 is a block synchronization;

8 is a block key;

9 - narrowband filter;

10 - grid generator frequencies;

11 - demodulator;

12 - unit management.

The proposed device has connected in series Q multiplier products 1 and Q of the delay elements 2, and the signal inputs of the multiplier products 11...1QUnited and are the input of the reference inputs of the multiplier products l1...1Qthrough the respective shapers 3 are connected to the outputs of switch 4, the input connected to the output of the generator SRP 5. The outputs of the delay elements 21...2Qconnected to respective inputs of the adder 6, the output of which is connected to the signal input of the multiplier l1+Qand with 2Q-M input b frequency 10 and (2Q-1) signal input unit of the keys 8, other (2Q-1) control inputs of the block of keys 8 are connected with the corresponding outputs of the control unit 12, the output of block keys 8 is connected to the reference input of the multiplier 1Q+1, the output of which is connected in series through a narrow-band filter 9 and the demodulator 11 is connected to the output device, and outputs the synchronization unit 7 is connected with the inputs of the generator SRP 5 and grid generator frequency 10.

The proposed device is as follows.

Generator SRP 5 produces periodic SRP, for example, 111-1-1 1-1 111... durationecoinciding with manipulative SRP input SFMS (Fig.3A). Switch 4 selects from this SRP Q sequence elements with a duty cycle of Q. for Example, when Q=2 is the sequence of odd (Fig.3b) and even (Fig.3b) elements. In the shaper 3 each element of a sequence is repeated Q times (expands to Q times) in combination with smoothing fronts resulting pulses in order to reduce the level of side lobes of the spectrum (Fig.3 d, 3D).

The output signals of the formers 31...3Qare reference signals, which are multiplied with the input SFMS in the multiplier products 11...1Q

It is easy VI... (Fig.3E, g).

The output signal of the i-th multiplier is delayed by a time (Q-1)ein the delay element 2i(Fig.S) and delayed signals of all multiplier products l1...1Qare summed in the adder 6. The output signal of the adder 6 is shown in Fig.3i.

Useful signal, which is contained in the total signal, shown in Fig.3K.

Thus, in the first stage, the input SFMS is converted into a sequence of coherent radio pulses with a duty cycle of Q (phase shift keying information signal is stored).

Transform spectra SFMS and narrowband interference is shown in Fig.4.

In Fig.4A shows the spectra of the input SFMS and narrowband interference at the input device.

Spectra of signal and noise at the output of the multiplier conventional correlation receiver unit rejectee, in which reference SRP coincides with manipulative SRP SFMS shown in Fig.4B. We emphasize that in this case the width of the output spectrum of the interference is equal to 2/e.

Fig.4B illustrates the first stage of processing SFMS in the present invention. The spectrum of the signal (in the form of a periodic pulse sequence) at the output of the adder 6 is represented R is the spectrum of the interference is equal to 2/Qe. Note that the clutter spectrum overlaps only two spectral lines of the signal in contrast to a conventional correlator.

Consider the second stage of processing SFMS. At this stage, is quasi-optimal signal from the output of the adder 6. The main distinctive feature of this stage is that the reference signal similar to the signal in Fig.3K, is formed at the output of the 8 keys of individual harmonic components generated by the grid generator frequency 10. Rejection of cosmic ray spectrum interference is achieved by the fact that the harmonic components of the reference signal on the reference input of the multiplier lQ+1corresponding to the affected components of the useful signal, are not allowed by the unit keys 8 (Fig.4 d).

Thus, in the present invention, the notch portions of the spectrum of the useful signal affected by noise is made simple with the exception of the harmonic components of the reference radiopulse signal, consisting of (2Q-1) spectral components.

After processing in the multiplier 1Q+1the signal is filtered by a narrow-band filter 9 and supplied to the demodulator 11, where there are information signal.

To determine the frequency components of the signal, Paraga at the output of the adder 6. Based on the analysis of the levels of all components of the control unit 12 determines the affected components and locks the corresponding keys in the block 8.

Thus, in the proposed device, the rejection of narrowband interference is as simple as opening the respective keys in the block 8.

The grid generator frequency 10 can be performed according to the scheme shown in Fig.5, where indicated:

10.1 - sequence generator of impulses;

10.21...102Q-1- narrowband filters.

You can oppose the comb filters 10.21...10.22Q-1in Fig.5 the comb filter 31...3nin Fig.1. The filters in Fig.5 narrowband, does not require mutual agreement, because they are intended for separate transmission exploded components of the reference signal. Therefore, their implementation is much simpler implementation combs mutually agreed bandpass filters in the unit of protection against narrowband interference in a device prototype.

The control unit 12 can be performed according to the scheme shown in Fig.6, where indicated:

12.1 - multiplier;

12.2 - adder;

12.31...12.32Q-1keys;

12.4 - narrowband filter;

12.5 - amplitude detector;

12.6 unit of analysis.

The control unit 12 C analysis 12.6, the outputs of keys 12.31...12.32Q-1connected to respective inputs of adder 12.2, the output of which is connected with the second input of the multiplier 12.1, (2Q-1) outputs of the unit of analysis 12.6 connected with the second inputs of the corresponding (2Q-1) keys, the first inputs of which are connected with the corresponding (2Q-1) outputs of the generator to the grid frequency 10 (Fig.2), other (2Q-1) outputs of the unit of analysis 12.6 are the outputs of the control unit 12 (Fig.2), and the first input of the multiplier 12.1 is 2Q-m input control unit 12.

The operation control unit 12 is as follows.

Command block analysis 12.6 (which can be executed on the microprocessor, for example, TMS 320Cxx, Motorola 56xxx, Intel and so on) are opened successively the keys 12.31...12.32Q-1, resulting in a multiplier 12.1 through the adder 12.2 served on one frequency component of the reference signal. Through a narrow-band filter 12.4 consistently are converted by the frequency of all components of the input signal that are detected amplitude detector 12.5.

The unit of analysis 12.6-based comparison levels are determined frequency components affected by interferences. This information is used to generate control signals on outputs 2Q..the AMI, described in the book [Makarov, S. B., Cicin N. A. Transmission of discrete messages via radio channels with limited bandwidth. - M.: Radio and communication, 1988, Chapter 3].

Claims

1. A way of taking complex photomanipulating signal on the background of narrowband interference, which consists in rejectee portions of the spectrum of the signal impressed narrowband interference removing manipulative pseudo-random sequence and subsequent demodulation of the received signal, wherein the signal processing are in two stages, the first stage in the removal of the pseudo-random sequence to form a useful signal in the form of a sequence of coherent radio pulses with a spectrum consisting of several spectral lines by the number of3, the spectrum of the narrowband interference transform in range, hitting two spectral lines of the useful signal, at the second stage, the correlation signal processing with simultaneous rejection of interfering spectrum by eliminating the corresponding harmonic components of the reference radiopulse signal.

2. Device for receiving complex photomanipulating signal containing the STI, connected in series narrowband filter and the demodulator, and the control unit and the adder, wherein the entered serial connected Q multiplier products and Q of the delay elements, and Q shapers signals, switch the unit key and the grid generator frequency, and signal inputs the Q multiplier products are combined and input device, the Q outputs of delay elements connected to respective inputs of the adder, the output of which through (Q+1)-th multiplier connected to the input of the notch filter, the output of the demodulator is an output device, the output of a pseudorandom sequence generator connected to the input of the switch, The Q outputs of which are connected to respective inputs Q shapers signals, the outputs of which are connected with the control inputs of the respective Q multiplier products, the second output of the synchronization unit connected to the generator input grid frequency (2Q-1) outputs of which are connected with the corresponding signal (2Q-1)inputs of the block of keys and (2Q-1)inputs of the control unit, the output control unit is connected to (2Q-1) control inputs of the block of keys, in addition, the output of the adder is connected to 2Q-M input control unit, and the output of block keys with oporn the

 

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