Method of demultiplexing light partial division multiplexing 16-QAM coherent communication system

The invention discloses a method of demultiplexing a light deflection division multiplexing 16-QAM coherent communication system. The method comprises the following steps: analog-digital conversion is conducted on a signal yt received by a communication system receiving end to obtain a digital signal yi of the receiving end; the receiving end digital signal yi is subjected to self-adaptive learning through independent component analysis to find out an inverse matrix of a transmission matrix Wi under the condition that t=iT+t0, wherein T is time interval between symbols, t0 is time migration of sampling, i is a natural number, and the transmission matrix Wi comprises white gaussian noise, phase noise and influence of rotation in random polarization state on a signal; the digital signal yi of the receiving end is subjected to compensation according to the inverse matrix Ki of the transmission matrix Wi. Compared with the prior art, higher performance is achieved.