半导体光电, 2018, 39 (1): 129, 网络出版: 2018-08-30
一种基于星座协作映射的改进P-OFDM方法
A Modified P-OFDM Scheme Based on Constellation Collaborated Mapping
星座协作映射 极性光OFDM 编码增益 峰均平均功率比 平均误码块率 constellation collaborated mapping P-OFDM code gain peak-to-average power ratio average codeword error ratio
摘要
针对室内高速光无线链路设计, 提出了一种新的光正交频分复用技术方案——改进极性光正交频分复用(MP-OFDM)。通过将星座协作映射技术引入到极性光OFDM(P-OFDM)系统中, 在获得高效的功率和频谱利用率、较低峰均平均功率比(PAPR)及较好误码性能的同时, 还可以进一步提高系统编码增益, 增加系统设计自由度。仿真实验表明, 与P-OFDM技术相比, 该方案的PAPR性能与其接近, 而平均误码块率性能则优于前者, 即MP-OFDM系统可在不牺牲PAPR的同时获得更好的平均误码块率性能。同时, 在功率分配方案中, 系统能在平均误码块率性能与PAPR性能之间取得更好的折衷。
Abstract
A modified polar optical OFDM (MP-OFDM) scheme for high-speed indoor optical wireless links was proposed. With constellation collaborated mapping applied in polar optical OFDM (P-OFDM) system, MP-OFDM can achieve better performance in terms of high efficiency power, spectrally-efficient, peak-to-average power ratio and bit error ratio. The system can further improve both of code gain and freedom degrees for optimal design. Simulation results demonstrate that peak-to-average power ratio of this new scheme is equally good as polar optical OFDM, and the average codeword error ratio is better than the latter. The P-OFDM using constellation collaborated mapping can obtain better average codeword error ratio performance in the mean time without sacrificing PAPR. At the same time, it can have a better tradeoff between the average codeword error ratio and the peak-to-average power ratio performance for power allocation scheme.
暴桐, 王旭东, 吴楠, 冯海燕. 一种基于星座协作映射的改进P-OFDM方法[J]. 半导体光电, 2018, 39(1): 129. BAO Tong, WANG Xudong, WU Nan, FENG Haiyan. A Modified P-OFDM Scheme Based on Constellation Collaborated Mapping[J]. Semiconductor Optoelectronics, 2018, 39(1): 129.