Patent ID: 7689132
Filing Date: 2010-03-30
Classification: H04B

Abstract:
1. 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.