Sending and receiving method of quadrature amplitude modulation signal, sending and receiving system of quadrature amplitude modulation signal, computer reading possible record medium, application of synchronous reception method of amplitude modulation signal

摘要

As for purpose of this invention, it is low low with the expedient which gives synchronous in carrier frequency threshold are method and the system which the QAM signal which can give recovery threshold sending and receiving are done. In order to achieve this, the QAM signal sending and receiving it does the method and the system of this invention. As for principal principle of this invention, with the symbol which is decided beforehand, there are times when bursting of Mm level QAM symbol is compensated. And, as for one part of the symbol which description above beforehand is decided from one bursting changing as for it is not to bursting of other things, the other part reverses periodically at the time of several bursting. Because of this, on receiving end, description above it was beforehand decided, (frequency is extracted understands) the QAM signal component which corresponds to symbol. Following to these components, reversal frequency is decided, when adjusting the synchronized frequency which is received with the said reversal frequency, the above-mentioned ambiguity is removed securely. Because of this, it becomes possible to get near to Shannon's threshold.