SU1601776A1

SU1601776A1 - Demodulator of phase-manipulated signals

Info

Publication number: SU1601776A1
Application number: SU884471869A
Authority: SU
Inventors: Александр Фелисович Мессель; Сергей Анатольевич Селибер; Евгений Брониславович Югай
Original assignee: Ленинградский Электротехнический Институт Связи Им.Проф.М.А.Бонч-Бруевича
Priority date: 1988-08-01
Filing date: 1988-08-01
Publication date: 1990-10-23

Abstract

Изобретение относитс к электросв зи и может использоватьс дл приема дискретных сигналов. Цель изобретени - повышение помехоустойчивости за счет снижени дисперсии фазы выдел емой несущей. Дл достижени указанной цели в демодул тор введены перемножитель 6 и формирователь 7 весовой функции, который выполнен в виде фазового детектора, фильтра, управл емого генератора и счетчика импульсов, образующих кольцо фазовой автоподстройки частоты, а также запоминающего блока, цифроаналогового преобразовател и фильтра нижних частот. Форма весовой функции хранитс в запоминающем блоке и определ етс конкретными характеристиками канала св зи и фильтров, предшествующих демодул тору. Максимум весовой функции приходитс на ту временную область тактового интервала, где текущее значение фазы входного сигнала близко к истинному. 1 з.п. ф-лы, 2 ил.The invention relates to telecommunications and can be used to receive discrete signals. The purpose of the invention is to improve the noise immunity by reducing the phase dispersion of the released carrier. To achieve this goal, a multiplier 6 and shaper 7 of a weight function are introduced into the demodulator, which is designed as a phase detector, a filter, a controlled oscillator and a pulse counter, forming a phase locked loop, as well as a storage unit, a digital-to-analog converter and a low-pass filter. The shape of the weighting function is stored in a storage unit and determined by the specific characteristics of the communication channel and the filters preceding the demodulator. The maximum of the weight function falls on that time domain of the clock interval, where the current value of the phase of the input signal is close to the true one. 1 hp f-ly, 2 ill.

Description

1313

Ьш.B

Ял..Yal ..

щu

ПP

/7/ 7

ЮYU

Фиг. 2FIG. 2

Claims

Claim

30 1. A phase-shifted signal demodulator comprising a phase detector block, an integrator block, a solver block, a clock synchronization block and a carrier extraction unit, the output of which is connected to the reference input of the phase detector block, the information input of which is the demodulator input, the output of which is the output of the decision block , a clock signal and whose inputs are connected respectively to the outputs of the block 4 ₀ clock and the block integrators and the clock signal inputs of which are connected respectively the outputs of the phase detector unit and the clock synchronization unit, characterized in that, in order to increase the noise immunity by 45 by reducing the phase dispersion of the allocated carrier, a multiplier and a weight function former are introduced, through which the output of the clock synchronization unit is connected to the first input of the multiplier, the output of which is connected to the input of the carrier separation unit 50, while the second input of the multiplier and the input of the clock synchronization unit are connected to the input of the demodulator.

2. The demodulator in π. 1, characterized in that the shaper of the weight function contains a series-connected phase detector, a filter, a controlled oscillator and a pulse counter, a series-connected digital-to-analog converter and a low-pass filter and a storage unit, the outputs and inputs of which are connected respectively to the inputs of the digital-to-analog converter and the outputs of the pulse counter the corresponding output of which is connected to the first input of the phase detector, the second input of which is the input of the weight function former, whose ode is the output of the low pass filter 5.

Figure 2.