Equalization of Rapidly time-varying Channels for OFDM Systems Using Subblock Tracking
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摘要: 在高速移动正交频分复用(OFDM)系统中，信道的快速变化引起载波间干扰（ICI），降低系统性能. 为了有效地抑制由于信道时变引起的ICI，提出了一种时域分段线性处理的均衡算法. 通过接收端时域加窗，使原有时变信道均衡简化为针对多个OFDM符号子块内的时不变线性处理，从而大大降低信道均衡算法的复杂度. 同时，从理论上深入解析了所提均衡算法的性能及加窗个数的优化，并推导出基于所提算法的信干比（SINR）闭式解. 仿真结果以及复杂度分析表明，相较于现有时变信道均衡方法，所提算法能明显提升系统性能，且计算复杂度更低.Abstract: In high mobility orthogonal frequency division multiplexing (OFDM) systems, temporal time-variation of mobile channel induces intercarrier interference, leading to performance degradation. In order to combat ICI, a novel equalization method for OFDM systems in time-varying wireless channels is presented. By taking advantage of subblock tracking, whose aim is to force each subblock of one OFDM block as time-invariant such that channel equalization can be performed by a time-invariant structure. Meanwhile, signal-to-interference-plus-noise ratio (SINR) is numerically evaluated and derived as a close-form expression to further optimize the types of window functions. Simulation results show that the proposed scheme outperforms the conventional schemes, while requiring a lower complexity.
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Keywords:
- channel equalization /
- OFDM /
- time-varying channel /
- subblock-tracking
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