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DCOOFDM

于 2022-01-25 发布 文件大小:1.24 kB
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可见光通信中的单发单出dcoofdm代码 基于直流偏置的OFDM方式   将双极信号变为单极的方法直流偏置DCO-OFDM,其基本原理是将OFDM信号加上一个直流偏置,即                        x(t )= X0(t)+BDC   再对所得信号x(t)进行削波,但是由于原信号X0(t)的峰值成高斯分布,削波必然会产生削波噪声,且BDC越小削波噪声越大,但是BDC过大将会造成信号 电平超出M-Z调制器线性范围出现失真,因此BDC的选取要适当.     通常系统设计会被平均的传输光功率限制,而误码率BER由光电检测后的电信号信噪比决定.对信号x(t),由于采用强度调制和平方探测,光功率Pop, 由E{x}决定,而电功率Pele。由E{x2}决定,所以光电功率的转换取决于时域信 号的分布。与ACO-OFDM不同,DCO-OFDM的削波电平与载波数有关系。 由于OFDM信号成高斯分布,如果BDC不是足够大,一些负的峰值就不能变为

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