The invention discloses a
wireless optical orthogonal multi-carrier communication method with a low peak to average
power ratio. The
wireless optical orthogonal multi-carrier communication method comprises the following steps that at a transmitting end, firstly, modulated
frequency domain signals are converted into a semi-positive definite planning convex
optimization problem by adopting a tone injection
algorithm via a relaxation method, and solving is carried out through general convex optimization and randomized methods; secondly, the
frequency domain signals are symmetrically mapped to subcarriers in a conjugate mode, and a
cyclic prefix is added after reverse fast Fourier transformation; at last,
time domain transmission signals are added into direct-current offset to drive a light-emitting
diode to emit light. At a receiving end, photovoltaic conversion is achieved through a
photodiode; signals are removed from the
cyclic prefix and
conjugate symmetry parts after amplification, filtering, analog-
digital conversion and fast Fourier transformation; the signals are modulated to be recovered in an original
planisphere; at last, receiving symbols are obtained through
demodulation. According to the
wireless optical orthogonal multi-carrier communication method, the peak to average
power ratio of a wireless
optical communication PFDM
system can be effectively reduced, requirements of a power
amplifier and an LED for linear degrees are reduced, non-linear
distortion is reduced, and receiving performance is improved.