METHOD FOR THE NON-COHERENT DEMODULATION OF A CONSTANT SYMBOL POWERED, LINEARLY MODULATED SIGNAL AND DEMODULATOR FOR IMPLEMENTING SUCH METHOD

摘要

PCT No. PCT/FR84/00123 Sec. 371 Date Jan. 9, 1985 Sec. 102(e) Date Jan. 9, 1985 PCT Filed May 4, 1984 PCT Pub. No. WO84/04640 PCT Pub. Date Nov. 22, 1984.The present invention relates to a process for the noncoherent demodulation of a linearly modulated digital signal with energy by constant symbol and a demodulator for performing this process. The process consists of demodulating a linearly modulated signal by a sequence of information symbols alpha 0, . . . , alpha N-1 to which has been added a Gaussian white noise. The signal received is processed by the demodulator in order to obtain sequences of blocks of L data, containing all the information of the received signal. By means of a recursive algorithm, from said data is deduced a sequence of symbols alpha 0, . . . , alpha N-1, maximizing an approximate probability function. The invention more particularly applies to satellite links and to vehicle radio communications.