SU540383A1 - Device for adaptive reception of discrete signals - Google Patents

Description

one

The invention relates to a technique for transmitting discrete information over multipath communication channels.

A device for adaptive reception of discrete signals in a multipath short-wave channel is known, comprising a receiver connected to adaptive equalizer 1.

However, the accuracy of the correction is not ensured in the known device.

The purpose of the invention is to increase the accuracy of the correction.

To do this, a reverse filter is connected to the device for adaptive reception of discrete signals in a multipath co-rotating channel channel between the receiver and the adaptive equalizer, to another input of which the output of the receiver is connected through a beam retarding time measuring unit, with an atom return filter consisting of a sectional delay line with taps connected to the signal inputs of the electronic switch, the control input of which is connected to the output of the beam delay measurement unit, and the switch outputs are connected to the additional inputs of the control circuit and through the regulators are connected to the inputs of the adder, the output of which is connected through the analysis circuit to the input of the blocking node and to the main input of the control circuit, the control outputs of which are connected to the control

the inputs of the regulators, and the output of the blocking node is connected to the installation input of the electronic switch; In addition, the beam delay measurement unit consists of a consistently connected matched filter, a threshold element, a time interval counter, and an integrator.

The drawing shows a block diagram of the device.

A device for adaptive reception of discrete signals in a multipath shortwave channel contains receiver 1, an adaptive equalizer 2, an inverse filter 3 that is turned on by receiver 1 and an adaptive equalizer 2 and connected to another input of receiver output 1 through a beam delay measuring unit 4.

The inverse filter 3 consists of a sectional delay line 5 with N taps, which are connected to the signal inputs of the electronic switch 6, the control input of which is connected to the output of the beam delay time measuring unit 4, and the outputs of the electronic switch 6 are connected to the additional inputs of the control circuit 7 and through the controllers 8 are connected to the N inputs of the adder 9, the output of which is connected through the analysis circuit 10 to the input of the block 11 and to the main input of the control circuit 7, the control outputs of which are connected to the control input rows regulators 8 and the output of the lock assembly and is connected to the set input of the electronic switch 6. The time measuring unit 4 includes rays zanazdyvani serially connected to the matched filter 12, the threshold element 13, time slot counter 14 and integrator 15.

The device works as follows.

Before starting work in the non-distributor, during the quasi-state time of the KB channel (no more than 100 ms), the measuring signal and the sequence of the Barker code, which, having passed through the KB multi-channel channel, enters: receiver 1 and then into the blocking device for beam retardation time 4, where it is produced extracting the KB channel beams, determining the distance between them, and generating a control signal by which the outputs of the electronic switch 6 are switched.

In parallel with the output of receiver 1, the signal is fed to the input of the sectional delay line 5 and the input of the adder 9. The signal from the N taps of the sectional delay line 5 is permanently connected to the inputs of the electronic switch 6, which is connected by the control signal from the beam retarding time measuring unit 4 taps of a sectional delay line 5 in accordance with the number of beams and the delay between them through regulators 8 to the inputs of the adder 9 and simultaneously to the control circuit 7. The signal from the output of the adder 9 through the analysis circuit 10 is fed to the input of the circuit Comparison 7 and parallel to the interlocking block I. The scheme of the equilibrium 7 sets the polarity and magnitude of the signal using the regulators 8, as a result of which the transmitting beams are compensated. The equalized signal, in which the large distortions are compensated, causes the minimum value of the distortion error in the analysis circuit 10, as a result of which the blocking node 11 of the electronic switch 6 is activated and the inverse filter 3 is ready to receive the transmitted discrete signal.

Upon expiration of time (approximately 100 ms), discrete information is transmitted over the channel, but the signal of which is subsequently controlled by adjusting the signal magnitude and polarity in the taps of the regulators 8 using the analysis circuit 10 and the control circuit 7.

Claims (3)

1. A device for adaptive reception of discrete signals in a multipath short-wave channel, containing a receiver connected to an adaptive equalizer, characterized in that, in order to increase the accuracy of correction, a reverse filter is connected between the receiver and the adaptive equalizer, to another input of which the receiver output is connected through a block measurements of the delay time of the rays. 2. Device but also. 1, characterized in that the inverse filter consists of a sectional delay line with taps, which are connected to the signal inputs of an electronic switch, the control input of which is connected to the output of the X-ray beam measurement unit, and the switch outputs are connected to additional inputs of the control circuit and through regulators connected to the inputs of the adder, the output of which is connected through the analysis circuit to the input of the blocking node and to the main input of the control circuit whose control outputs are connected to the control inputs of the re gul tors, and the output of the blocking node is connected to the installation input of the electronic switch. 3. Device but nn. 1 and 2, characterized in that the beam delay measurement unit consists of a series-connected matched filter, a threshold element, a time interval counter and an integrator. The source of information taken into account in the examination. I. Bazilevich E. V. et al. “Data Transmission In Sb. "Communication technology abroad." M., Holy Hour, 1969, p. 36-45 (prototype).