Simplified channel estimation for OFDM systems with multiple transmit antennas
Simplified channel estimation for OFDM systems with multiple transmit antennas
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DOI：
10.1109/7693.975446
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
Geoffrey Y. Li
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文献类型：
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作者：
Geoffrey Y. Li
多个发射和接收天线可用于正交频分复用（OFDM）系统，以提高通信质量和容量。在本文中，我们提出了两种提高性能并降低信道参数估计复杂性的技术：最佳训练序列设计和简化信道估计。最优训练序列不仅简化了初始信道估计，而且获得了最佳的估计性能。简化的信道估计显着降低了信道估计的复杂性，但代价是性能下降可以忽略不计。通过对具有两个发射和两个接收天线的 OFDM 系统的仿真，证明了新技术的有效性。每个码字 240 个信息位的空时编码用于传输分集。根据仿真结果，对于具有典型城市或丘陵地形延迟分布和 40 Hz 多普勒频率的信道，10% 的字错误率所需的信噪比仅为 9 dB 左右。
Multiple transmit-and-receive antennas can be used in orthogonal frequency division multiplexing (OFDM) systems to improve communication quality and capacity. In this paper, we present two techniques to improve the performance and reduce the complexity of channel parameter estimation: optimum training-sequence design and simplified channel estimation. The optimal training sequences not only simplify the initial channel estimation, but also attain the best estimation performance. The simplified channel estimation significantly reduces the complexity of the channel estimation at the expense of a negligible performance degradation. The effectiveness of the new techniques is demonstrated through the simulation of an OFDM system with two-transmit and two-receive antennas. The space-time coding with 240 information bits per codeword is used for transmit diversity. From the simulation, the required signal-to-noise ratio is only about 9 dB for a 10% word error rate for a channel with the typical urban- or hilly-terrain delay profile and a 40-Hz Doppler frequency.