White-light LED modulation method combined with asymmetric Turbo coding

The invention aims to provide a white-light LED modulation method combined with asymmetric Turbo coding. The method comprises the following steps: binary random signals are generated and subjected to asymmetric Turbo coding, and the coded sequence is subjected to 16QAM (Queued Access Method) modulation at first and then discrete Fourier transform; the transformed data is transformed to the time domain through inverse discrete Fourier transform after being subjected to local mapping and then transformed to the time domain and added with cyclic prefix; the signals are subjected to digital-to-analog conversion and sent to a white-light LED wireless optical channel; the received signals are subjected to analog-digital conversion and the cyclic prefix is removed; the signals are subjected to discrete Fourier transform and then single-carrier de-mapping; and the signals receiving the above treatment is subjected to inverse discrete Fourier transform, then 16 QAM demodulation and at last asymmetric Turbo decoding. The white-light LED modulation method provided by the invention can strike an average of the error ratio within the whole signal-to-noise ratio range of the system, and lowers the peak power rate of the system.