| 摘要: |
| 针对电力线通信（PLC）正交频分复用（OFDM）系统存在频率掩码和频谱资源利用率低等问题，提出将正交频分复用/偏移正交幅度调制（OFDM/OQAM）技术应用到PLC系统中。该技术通过选用频率选择性较好的滤波器来抑制带外干扰，且不需要循环前缀，但是OFDM/OQAM系统在PLC频域复数信道下会产生严重的自干扰，传统的均衡算法并不能有效地消除OFDM/OQAM系统的固有干扰。针对这种情况提出了一种基于信道相位预处理的均衡算法。该算法的思想是让接收信号乘以一个信道相位调整因子，使等效信道的虚部尽量小，以此来减小接收信号中的干扰分量。仿真结果表明，与传统的均衡算法相比，所提算法在误比特率为1.0×10－6时可以获得0.5dB的性能提升。 |
| 关键词: 电力线通信（PLC） 正交频分复用/偏移正交幅度调制 复数信道 固有干扰 均衡算法 |
| DOI： |
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| 基金项目:国家科技重大专项(2016ZX03002010-003) |
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| A channel phase preconditioning equalization algorithm for power line OFDM/OQAM communication systems |
| ZHENG Jianhong,ZHANG Heng,LI Fei |
| (Communication Core Chip, Protocols and Application Innovation Team, Chongqing University of Posts and Telecommunications,Chongqing 400065,China) |
| Abstract: |
| Aiming at the problem of frequency mask and low spectrum resource utilization in Power Line Communication(PLC) OFDM system,the Orthogonal Frequency Division Multiplexing/Offset Quadrature Amplitude Modulation(OFDM/OQAM) technology is proposed to be applied to PLC systems.The technique uses a filter with better frequency selectivity to suppress the out-of-band interference,and it doesn′t require a cyclic prefix.However,the OFDM/OQAM system will cause severe self-interference in PLC frequency domain channel which is complex.The traditional equalization algorithm doesn’t effectively eliminate the inherent interference of OFDM/OQAM system,so an equalization algorithm based on channel phase preprocessing is proposed for this situation.The idea of this algorithm is that the received signal is multiplied by a channel phase adjustment factor,so that the imaginary part of the equivalent channel is as small as possible,thus reducing the interference component in the received signal.The simulation results show that compared with the traditional equalization algorithm,the proposed algorithm can achieve the performance improvement of 0.5 dB when the bit error rate(BER) is 1.0×10－6. |
| Key words: power line communication(PLC) orthogonal frequency division multiplexing/offset quadrature amplitude modulation(OFDM/OQAM) complex channel inherent interference equalization algorithm |
