基于OFDM调制的发射端宽带频域波束成形  

Transmit Broadband Frequency-domain Beamforming Based on OFDM Modulation

作　　者：邱玉章 曾桂根[2] QIU Yuzhang;ZENG Guigen(College of Communication and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210000, China;Institute of Signal Processing and Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210000, China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210000 [2]南京邮电大学信号处理与传输研究所,江苏南京210000

出　　处：《电视技术》2018年第2期18-24,共7页Video Engineering

基　　金：国家自然科学基金面上项目(61471202)

摘　　要：本文基于OFDM调制系统,提出一种应用于宽带多天线场景下的发射端频域波束成形算法。首先仿真验证传统的窄带波束成形算法应用于宽带通信系统时,由于频率不匹配而造成的波束方向图失配,从而导致通信系统性能下降的问题。然后从发射端的角度考量,以预补偿的方式对OFDM调制的星座图映射之后,IFFT之前的频域信号进行宽带波束成形处理,仿真了在莱斯信道环境下的系统模型,并以误码率为衡量标准对提出的算法进行性能评估。结果表明,发射端应用频域宽带波束成形算法能够有效的降低接收端的误码率,改善通信系统性能。Based on OFDM modulation,a frequency-domain beamforming algorithm which applied to transmitter in the scenario of broadband multi-antenna is proposed. The simulations are built to verify the performance loss of communications system caused by mismatched beam pattern when the classic narrow-band beamforming algorithms are applied to the broadband communications system. The data symbols after constellation mapping before sent into IFFT can be processed with proposed beamforming algorithm in frequency-domain for transmitter. The simulations of frequency-domain beamforming algorithm in the scenario of Rician channel are built to evaluate this algorithm based on BER. The result shows that the proposed beamforming algorithm can decrease the BER efficiently and improve the performance of communications system.

关 键 词：发射端 波束成形 频域 宽带 OFDM 

分 类 号：TN92[电子电信—通信与信息系统]