A Wireless Optical Orthogonal Multi-Carrier Communication Method with Low Peak-to-Average Power Ratio
A peak-to-average power ratio and orthogonal multi-carrier technology, applied in multi-carrier systems, multi-frequency code systems, free space transmission, etc., can solve problems such as low frequency utilization, lower overall system performance, and high signal peak-to-average power ratio
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[0045] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:
[0046] Such as figure 1 As shown, the tone injection algorithm selects one of multiple constellation points to represent the same transmitted symbol, namely Point A in the figure can also be represented by other 8 points, but in order not to excessively increase the average power of the transmitted signal, it should be replaced by points A3 and A4 as much as possible.
[0047] Such as figure 2 , the transmitted data is serial-to-parallel converted after M-QAM modulation to form a frequency domain signal X, using the tone injection algorithm, it is necessary to find a suitable p k and q k The peak power of the transmitted time-domain signal is minimized. The transmitted signal power in the time domain can be written as
[0048] The vector to be optimized is r=[1p T q T ] T , p=[p 0 ...p N / 2-1 ] T , q=[q 0 ... q N / 2-1 ] T ,p k ∈{0...
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