RU2714375C1 - Method of protecting broadband communication systems from such interference - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: invention relates to radio engineering, more specifically to broadband communication systems using noise-like signals which are exposed to interference of different intensity and nature, including artificial interference. Technical result is achieved by detecting such interference based on different criteria with subsequent transition to another coding sequence.

EFFECT: technical result is high noise immunity of broadband communication channel from such interference.

1 cl, 1 dwg

Description

The invention relates to radio engineering, and more specifically to broadband communication systems using noise-like signals that are subject to interference of varying intensity and nature, including artificial ones. Its use during military operations is especially useful when the absence of uninterrupted communication can lead to undesirable consequences.

Such interference is interference similar to the structure of the transmitted (received) signal.

It is known that broadband communication systems (SHSS) or systems using noise-like signals have high noise immunity, due to which they are used in the presence (or possibility of occurrence) of interference of varying intensity and nature. The most dangerous interference to the HSS is powerful narrowband interference due to the simplicity of generation and similar interference due to the similarity with the signal structure. In the most general case, the noise immunity of the SSS is determined by the base of the signal used, more detailed estimates are available in the specialized literature [1].

In recent years, due to the development of microelectronics and telecommunication technology, the production of such interference has been significantly simplified. In order to suppress the SHSS radio channel with any unknown signal, the suppression equipment first records the signal of the ShSS transmitter, stores it for some time in memory, then re-radiates this signal to the air. The ShSS receiver, receiving two signals with an identical structure, differing only in power and formation time, is disoriented and its normal functioning becomes impossible.

It is not possible to use classical methods to protect against such interference, for example, notch [2] or digital processing [3].

An object of the invention is to increase the noise immunity of a broadband communication channel from such interference.

The technical result is achieved by detecting such interference based on various criteria with the subsequent transition to another coding sequence.

To solve this problem, a method is proposed for protecting broadband communication systems from such interference, based on a change in the code sequence, characterized in that they detect the presence of such interference by criteria such as a sharp change in signal level, a sharp increase in noise level, signal loss, then change the coding sequence , this is reported to the receiving party, which also switches to a new coding sequence from the existing data bank, while the signal is similar to the structure of the image It is concealed according to the existing theory of noise immunity; when the signal of such interference changes to a new coding sequence, the coding sequence of the communication channel is changed again to the next one, thus the stability of the communication channel to such interference is determined only by the number of coding sequences available in its bank, as well as the rate of change.

The drawing shows a functional diagram of the solution of the method, which shows:

1 - transceiver of the first station SSS 1;

2 - transceiver of the second station SHSS2;

3 - noise generator;

4 - block definition interference;

5 - a bank of coding sequences;

A1 and A2 - antennas of both SHSS;

A3 - noise generator antenna;

RK1 and RK2 are radio channels.

The circuit has the following connections:

The transceiver 1 of the first station of the BSS 1, the first output through the antenna A1, the radio channel RK1 is connected to the antenna A2 of the transceiver of the second station BSS2, and the second output is connected to the unit for determining interference 4, the output of which through the bank of coding sequences 5 is connected to the transceiver of the first station BSS1.

The noise generator 3 antenna A3 through the radio channel PK2 is connected by antenna A1 of the first SHSS1.

The scheme according to the proposed method works as follows: The SHSS 1 transceiver detects the presence of such interference on the basis of various criteria: a sharp change in the signal level, distortion of the signal shape, a sharp increase in the noise level, signal loss and the receipt of a receipt of the signal.

The transceiver SHSS 1 changes the coding sequence and reports this to the transceiver SHSS 2.

The ShSS 2 transceiver also switches to using a new coding sequence from a pre-existing bank.

As soon as the coding sequence has changed, the signal of the interference generator, which is a recorded version of the signal with the previous sequence, is recognized by the HSS as a signal of a similar structure and processed according to the existing noise immunity theory. In order to suppress the functioning of the HSS again, it is necessary to record the emitted HSS signal from the ether again and reemit it, which takes time. But even after this, the SSS will again determine the presence of interference according to the described criteria and switch to the use of the following sequence.

Thus, the resistance of an HSS to such interference is determined by the number of coding sequences available in its bank, as well as the rate of change. If we assume the random nature of their change, we can say that such an SSS can work indefinitely, being under the influence of an interference generator operating according to the described principle.

Literature

1. Varakin L.E. Communication systems with noise-like signals. - M .: Radio and communications, 1985. - 384 s: ill.

2. Malygin I.V. One way to protect broadband communication systems from powerful narrowband interference. No. 11, 2001, Pages: 34-39. Magazine: Telecommunications. Publisher: Science and Technology. LLC (Moscow). ISSN: 1684-2588

3. Gantmakher V.E., Bystrov N.E., Chebotarev D.V. Noise-like signals. Analysis, synthesis, processing. St. Petersburg: Science and Technology, 2005 .-- 400 p. - ISBN 5-94387-158-6.

Claims (1)

A method of protecting broadband communication systems from such interference, based on a change in the code sequence, characterized in that they detect the presence of such interference by criteria such as a sharp change in signal level, a sharp increase in noise level, signal loss, then change the coding sequence, notify the receiving side, which also switches to a new coding sequence from the existing data bank, while a signal of a similar structure is processed according to the existing theory of noise ychivosti; when the signal of such interference changes to a new coding sequence, the coding sequence of the communication channel is changed again to the next one, thus, the stability of the communication channel to such interference is determined only by the number of coding sequences available in its bank, as well as the rate of change, and the interference generator works as follows: records the transmitting signal from the communication channel by any coding sequence, stores it in memory, then re-radiates this signal to the air.

Images