分析了空间频率分集MIMO—OFDM系统的DFE—SDR译码算法。提出了一种能充分利用空间分集、空间复用、频率复用增益,且能对抗时间选择性和频率选择性衰落的空时频率分集MIMO-OFDM系统,结合判决反馈均衡(DFE)以及半定松弛检测(SDR)的优点,经过推导得到一种应用在空时频率分集MIMO—OFDM系统的DFE—SDR检测方法,该算法能同时得到较理想的系统性能和算法复杂度。系统仿真证明,该方法与DFE检测算法相比,误码率性能得到了较大提高,可以适用于更广泛的通信环境。
A spatial multiplexing and diversity joint transmit structure for MIMO-OFDM system is proposed. Space-Frequency Block Coding (SFBC) is used over the system' s spatial multiplexing layers to obtain both space diversity and frequency diversity (SFD) gain. According to the idea of DFE and SDR detection, a joint DFE and SDR detection algorithm for SFD-MIMO-OFDM system is also proposed. The algorithm can achieve a good balance of complexity and BER performance. Simulations prove that the BER performance improvedgreatly compared with generic DFE detector after the algorithm is applied in SFD-MIMO-OFDM system.