多天线OFDMA信号盲解码算法研究  

Blind Decoding for Multi-Antenna OFDMA Signal

作　　者：韩煜 沈雷 卜燕燕[2] 

机构地区：[1]通信信息控制和安全技术重点实验室,浙江嘉兴 [2]杭州电子科技大学通信工程学院,浙江杭州

出　　处：《电路与系统》2017年第1期8-20,共13页Open Journal of Circuits and Systems

摘　　要：论文提出了多天线异步情况下基于独立分量分析的OFDMA (Orthogonal Frequency Division Multiple Access)信号盲解码算法。所提算法把接收到的OFDMA信号看成用户信息在IFFT (Inverse Fast Fourier Transform)矩阵上的投影,可以在传输延迟及信道未知情况下,把接收信号建模成盲源分离的形式,完成子载波分离和信息盲解码。所提基于快速独立分量分析盲解码算法不需要去除循环前缀,相比传统OFDMA基于MMSE信道估计和FFT解码的算法,增加了接收信号能量,提高了解码性能。理论分析和仿真结果表明,这种不需要训练序列的盲解码算法比传统解码算法具有更好的性能。Multi antenna asynchronous OFDMA (Orthogonal Frequency Division Multiple Access) signal de-coding algorithm based on independent component analysis is proposed in this paper. According to the characteristics that OFDMA signal can be regarded as the subspace projection of the user signal in the IFFT (Inverse Fast Fourier Transform) matrix, the proposed method can be used for subcarrier separation and decoding without channel information and transmission delay by making the received signal as a form of blind source separation. The proposed blind decoding method based on fast independent component analysis does not need to remove the cyclic prefix, which increases the energy of the received signal. As such, the decoding performance is improved. Compared with the traditional MMSE decoding method based on FFT, theoretical analysis and simulations show that the proposed method has better performance.

关 键 词：多址正交频分复用 独立分量分析 载波估计 盲解码 

分 类 号：TN91[电子电信—通信与信息系统]