Real-time reception of NHS-OFDM signal with SPA- enhanced channel estimation for intensity-modulated direct-detection systems  

作　　者：Gang Chen Ming Chen Wen Chen Lede Yin Aitao Deng Yuxin Cai Dengqiao Wang 陈港;陈明;陈雯;尹乐得;邓爱桃;蔡宇昕;王邓桥(School of Physics and Electronics,Hunan Normal University,Changsha 410081,China)

机构地区：[1]School of Physics and Electronics,Hunan Normal University,Changsha 410081,China

出　　处：《Chinese Optics Letters》2022年第5期7-13,共7页中国光学快报（英文版）

基　　金：This work was supported in part by the National Natural Science Foundation of China(No.61805079);the Hunan Provincial Natural Science Foundation(No.2020JJ4433);the Hunan Province College Students Research Learning and Innovative Experiment Project,China(No.S202010542058).

摘　　要：In this Letter,we have experimentally verified a low-complexity subcarrier pairwise-averaging(SPA)-enhanced channel estimation(CE)method for small-size fast Fourier transform(FFT)non-Hermitian symmetric orthogonal frequency-division multiplexing(NHS-OFDM)transceivers.Compared with intra-symbol frequency averaging(ISFA),more than 20% look-up tables and 10%logic power consumption can be saved.The least-square(LS),ISFA,and SPA CE methods are compared by offline and real-time digital signal processing approaches.The results show that the receiver sensitivity of the SPA NHS-OFDM transmission system with 64/128-point FFT can be improved by more than 1 dB at the bit error rate of 3.8 ×10^(-3) compared to the LS.

关 键 词：NHS-OFDM least-square intra-symbol frequency-averaging subcarrier pairwise-averaging 

分 类 号：TN929.5[电子电信—通信与信息系统]