SU828427A2 - Radio communication line for multibeam channels - Google Patents

Description

one

The invention relates to radio engineering, can be used in radio communications and other areas where quasi-coherent combining and demodulation of an MES with an information binary FM is required, and is an improvement of the known invention described in the author. St. No. 510790.

According to the main author. St. No. 510790 is a known radio link for multipath channels, containing a phase handler, a transmitter, a clock extractor, a delay element, a trigger, generators of consecutive frequency-spread signals, electronic keys on the transmitting side, and an input block, information and auxiliary paths, consisting of a phase detector, an integrator and a regenerator, narrow-band filters, electronic keys, a synchronization unit, a multiplier and additional electronic keys 1. However, this line is not produces error detection in the communication channel.

The purpose of the invention is to detect errors.

For this, an additional phase detector, an additional integrator, an additional regenerator and an error counter are introduced into a known radio link for multipath channels, the first input of the additional phase detector on the receiving side is connected to the multiplier output, the second input is connected to the second inputs of phase detectors, the output is additional phase detector through a serially connected additional integrator and an additional regenerator connected to the input of the error counter, another input Tel'nykh regenerator is connected with the control inputs of the additional electronic switches. The drawing shows a structural electrical circuit of the receiving side of the proposed device.

The receiving side of the proposed radio link for multipath channels contains input unit 1, information and auxiliary paths 2 and 3, each of which consists of phase detector 4 (5), integrator 6 (7) and regenerator 8 (9), multiplier 10, electronic keys 11, narrowband filters 12, additional electronic keys 13, synchronization unit 14, additional phase detector 15, additional integrator 16, additional regenerator 17, and error counter 18.

The device works as follows.

In the initial position, the four first electronic keys 11 are disintegrated, and the four additional electronic keys 13 are alternately locked and opened when receiving their sub-element from the sub-elements of the first parcel. Narrowband filters 12 in the previous data packet are powered and are in extrapolation (free mode) mode. Then four additional electronic keys 13 are alternately closed when receiving their sub element and disconnected when receiving the next one, and in the phase detector 4 a quasi-coherent demodulation of the first elements of the first package is carried out, accumulated in the integrator 7 and a decision is made to remove this package from the regenerator 9. Thus, it can be seen that the decision to relieve the manipulation in the regenerator 9 is carried out when using as the reference oscillations for the phase detector 4 (5) the reference oscillations formed x in narrowband filters 12 at the expense of the previous information package. After a decision has been made in the auxiliary path 3 about the sign of the first and source in the phase detector 4, the quasi-coherent demodulation of its remaining sub-elements is carried out with the decision about the sign of the whole package in the regenerator 8.

At the same time, the pairs of primary and secondary electronic switches 11, 13 are interrupted (at the reception of their subelement) and disconnected at the reception of the next one, i.e., in this case, the current filtering changes to extrapolation.

When receiving subelements of the second parcel, the operation of the keys is as follows: four subsequent electronic keys 11 are open, and four subsequent additional electronic keys 13 are alternately closed when receiving their subelement and disconnected when receiving the next subelement of the same number.

Further, the operation algorithm is repeated. When the third parcel is received, the operation algorithm is similar to the first one, and so on. If, at the output of the regenerator 9, the decision to remove the manipulation is wrong, then at the output of the multiplier 10 the polarity of the voltage will be negative. In the additional phase detector 15, this voltage is detected, then integrated in the additional integrator 16, and in the additional regenerator 17 a decision is made about its sign. This solution is recorded in the error counter 18.

Thus, the proposed device registers the erroneous decisions of fourfold separation (errors in the removal of manipulation).

Claims (1)

Invention Formula Radio line for multipath channels on aut. St. No. 510790, characterized in that, in order to detect errors, an additional phase detector, an additional integrator, an additional regenerator and an error counter are introduced, while on the receiving side the first Exit of the additional phase detector is connected to the output of the multiplier, the second input is connected to the second inputs of the phase detectors, the output of the additional phase detector through a series-connected additional integrator and an additional regenerator is connected to the input of the error counter, another input of the additional the regenerator is connected to the control inputs of additional electronic keys. Sources of information taken into account in the examination of 1 USSR Author's Certificate No. 510790, cl. H 04B 7/22, 1976 (prototype).