SU1288924A1 - Device for synchronizing a receiver of multiposition signals - Google Patents

Abstract

The invention relates to telecommunications. The purpose of the invention is to improve accuracy. The device contains a phase correction unit 1, a phase control unit 2, a detector 3, a resuscitating unit 4. The sequentially connected decorrelator 5, the multiplication blocks 7 and 8, and the adder 6 are newly introduced. 1 slug. o 00 00 (; about th N

Description

one

The invention relates to the field of telecommunications and other areas related to the reception of modulated data signals transmitted over communication channels, and is intended to synchronize signals transmitted by multi-position modulation methods using correlation coding, which results in the output of the transmitter with partial response (bi-pulse signals).

The purpose of the invention is to improve accuracy.

The drawing shows an electronic structural diagram of the proposed device.

The synchronization device of the receiver of multi-position signals contains a phase correction block 1, a phase control block 2, a detector 3, a decisive block 4, a decorrel - a torus 5, an adder 6, the first 7 and the second 8 multiplications blocks.

The synchronization device of the receiver of multi-position signals works in the following way.

15 values. Therefore, when generating control signals for block 1 operation, it is necessary to focus on a random, statistically independent component in the received signal. Thus, it becomes necessary to transform (decorre) the received signal in order to isolate this random component, i.e. randomization of phase adjustment control signals. If, however, the presence of correlation links in the received signal-corrected signal does not come through the input to block 1, in which, based on the signals generated in block 2, 25 le, the control of the operation of block 1 will be compensated for the phase error, caused incorrectly, which will lead to nana non-phase modulation, the presence in the communication channel of a jitter phase of the carrier wave and other factors. The signal then goes to decision block 4 and detector 3, in which 30 estimate of the corrected signal is performed. In addition, in the decider unit 4, in each subchannel, the difference between the corrected signal from the output of unit 1 and its estimate applied to the decisive unit 4 from the output of detector 3, i.e. the error signal (,), is determined. The signal from the output of the detector 3 is fed to the decorrelator 5, the signals from the output of which are used to form the signal of a significant phase error of the corrected signal at the output of block 1, and this, in turn, reduces the noise immunity of receiving data signals.

Claims (1)

Invention Formula unit controlling the operation of unit 2. The need to use decorrelator 5 in the control circuit for adjusting the phase of the carrier oscillation is justified as follows. The synchronization device of the receiver of multi-position signals, containing a phase control unit, the output of which through a phase correction unit is connected to the combined first and second inputs of the decision unit and the detector, whose outputs are outputs of data evaluation signals and connected to other inputs of the deciding unit, different By the fact that, in order to increase accuracy, a decorrelator, the first and second multiplication blocks and an adder, the output of which is connected to the input of the block, are introduced control of the phase, and to the second inputs of the neuroredural (incomplete) compensation of the 45th and the second multiplication unit, phase errors in the corrected, respectively, outputs of the decision block are connected, Signal to a significant extent, in this case, determines the noise immunity of signal reception to the inputs of the decorrelator. The outputs of the detector are correspondingly. 1288924 This is especially true when receiving multi-position signals with a large number of amplitude gradations. The phase correction in block 2 is carried out on the basis of an analysis of the projections of the reading value of the received 5 signals for coherent oscillations R and Q. In this case, for correct formation of control signals, coming from the output of block 2, it is necessary that the analyzed reference values are statically independent. However, the sampled values of the signals with a partial response do not have such independence, i.e. there are correlation relationships between the individual (depending on the class of signals used) the sampling values. Therefore, when generating control signals for block 1 operation, it is necessary to focus on a random, statistically independent component in the received signal. Thus, it becomes necessary to transform (decorre) the received signal in order to isolate this random component, i.e. randomization of phase adjustment control signals. If, however, we do not take into account the presence of correlation links in the received signal 0 5 le, the control of the operation of block 1 will be incorrect, which will lead to le, then the control of the operation of block 1 will be incorrect, which will lead to the presence of a significant phase error of the corrected signal at the output of block 1, and this, in turn, reduces noise immunity of receiving data signals. Invention Formula A synchronization receiver device for multi-position signals comprising a phase control unit, the output of which is connected via a phase correction unit to the combined first and second inputs of a decisive unit and a detector, whose outputs are outputs of data evaluation signals and connected to other inputs of the decisive unit, characterized in that in order to increase accuracy, a decorrerator, the first and second multiplication blocks and an adder, the output of which is connected to the input of the block, are introduced in series.