同时含有限幅失真和量化失真的OFDM系统的联合优化

Joint optimization of the OFDM system simultaneously corrupted by clipping and quantization distortions

针对同时含有限幅失真和量化失真的OFDM系统,首次从端到端链路的角度,研究该系统的联合优化问题.建立了相应的多变量多目标优化模型,并使用NSGA-Ⅱ算法,通过软件仿真给出该优化模型的帕累托前沿面.仿真结果证明,在USQ位宽为1或2 bit时,该系统可以取得超过5 dB的峰均比增益,而同时损失的平均信道容量却远小于0.1 bps/Hz.同时给出该系统BER性能的闭合表达式,并使用软件仿真验证了该表达式的正确性.

We consider the OFDM system simultaneously corrupted by the clipping distortion and quantization distortion. Joint optimization of such an OFDM system from the standpoint of end-to-end link is investigated. The corresponding multi-variable and multi-object optimization models are established and the Pareto front is obtained through software simulation by employing the NSGA-11 algorithm. Results show that at USQ width of 1 or 2 bit, more than 5dB peak-to-average power ratio gain is achieved while the loss of the average channel capacity is much less than 0. 1 bps/Hz. Meanwhile, the theoretical BER of the OFDM system is derived and its accuracy is verified by software simulations.