Delay demodulator for burst - mode - psk - signal

摘要

PURPOSE: To provide a delay detection circuit capable of quickly and startly executing phase correction with high accuracy and superior an error rate. ;CONSTITUTION: A phase correction quantity estimation apparatus 5a which estimates phase correction quantity when a burst signal is received estimates a transmission symbol assuming that reception is performed by a known symbol string when it is recognized in advance that the known symbol with sufficient length of a preamble signal, etc., is transmitted asynchronously. Also. a phase correction quantity estimation apparatus 5b estimates a correct phase correction quantity from either the phase correction quantity in which phase difference is corrected by using a transmission symbole estimated by the phase correction quantity estimation apparatus 5a in advance or ideal phase difference from which a reception symbol estimated from the one in which the phase difference is corrected is to be outputted when the transmission symbol is unknown and also, it is impossible to estimate after a synchronous state is established. Thereby, a demodulation symbol signal 109 can be obtained by using a corrected phase signal 108 from which the influence of a frequency offset can be eliminated by a demodulator 8.;COPYRIGHT: (C)1994,JPO&Japio