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中文摘要：
本文研究了空间频率分集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4G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该4G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，该方法与普通DFE检测算法相比，误码率性能得到了较大提高，是一种有实用价值的译码算法，可以在4G移动通信系统中广泛应用。
英文摘要：
We studied the DFE-SDR algorithm in MIMO-OFDM system. An innovational 4G system which takes full use of space diversity, spatial multiplexing, and frequency diversity, and can countermeasure the decay of time and frequency selectivity is proposed. According to the idea of DFE and SDR detection, a joint DFE and SDR detection algorithm for the 4G system is also presented. The algorithm can achieve a good balance of complexity and BER performance. Simulations prove that the BER performance improved greatly with the proposed algorithm in comparison with generic DFE detector, which can be widely used in 4G system.
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