Interference-rejection coding method for an optical wireless communication system and the optical wireless communication system thereof

An interference-rejection coding method for being used in an optical wireless communication system having an optical wireless transmitter and an optical wireless receiver, said method comprising the steps of:

• (a) encoding a data signal for transmission using a block code encoder with a block code and generating an encoded block code;
• (b) delay modulating said encoded block code into a modulated code using a delay modulation unit of delay modulation technique;
• (c) converting said modulated code into an optical data signal for transmission;
• (d) converting said optical data signal back to an electrical data signal;
• (e) filtering out low frequency interferences in said electrical data signal to generate a filtered signal;
• (f) over-sampling said filtered signal at the receiver's end to generate a sampled signal, and selecting correct phase from said sampled signal to form a recovered data signal;
• (g) delay demodulating said recovered data signal into a demodulated data signal using a demodulator of delay modulation technique;
• and
• (h) decoding said demodulated data signal, thereby to obtain a corresponding original data signal;
• wherein said block code encoder makes the number of bits 0 and 1 passing through said delay modulation unit equal.