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单用户正交频分复用(OFDM)系统通常使用插入的频域导频获得信道频域响应(CFR),将此CFR变换到时域进行滤波以获得更准确的信道估计。上行正交频分多址接入(OFDMA)系统中由于每个用户信号占用不同的子载波且经过的信道不同,使用上述方法会由于窗函数畸变产生能量泄漏。该文提出一种时域滤波频域补偿(TFFC)方法,使用补偿向量对时域滤波后的CFR进行补偿,降低变换域算法中由于畸变引起的能量泄漏,并给出在稀疏信道条件下该补偿向量的简化解。仿真表明:采用该方法,上行OFDMA信道估计的性能得到很大改善。
Single-user orthogonal frequency division multiplexing (OFDM) systems usually use an inserted frequency-domain pilot to obtain a channel frequency-domain response (CFR), which is transformed into the time domain for filtering to obtain a more accurate channel estimate. In the OFDMA system, since each user signal occupies a different subcarrier and passes through different channels, the above method may generate energy leakage due to distortion of the window function. In this paper, a time-domain filtered frequency-domain compensation (TFFC) method is proposed. The compensation vector is used to compensate the time-domain filtered CFR to reduce the energy leakage due to distortion in the transform domain algorithm. Simplified Solution of Compensation Vector. Simulation shows that using this method, the performance of uplink OFDMA channel estimation is greatly improved.