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引用次数: 21
摘要
研究了改进的信道估计对ieee802.11 n OFDM MIMO系统的影响。考虑了三种信道估计方法:最大似然(ML)、时域截断(TDT)和基于模型(MB)。TDT和MB在信道延迟扩展较短的情况下特别有用。对于MMSE接收器，对于各种调制和编码方案，MB在TGn信道B和D上的包错误率性能比ML提高1-2.5 dB。TDT是MB的简化版本，在低信噪比下比ML提高1-2 dB。但是，当也采用发射波束形成时，改进效果会减弱。
Channel estimation in a proposed IEEE802.11n OFDM MIMO WLAN System
Effects of improved channel estimation are studied for a proposed IEEE 802.11n OFDM MIMO system. Three channel estimation methods are considered: maximum likelihood (ML), time-domain truncation (TDT) and model-based (MB). TDT and MB are particularly useful when the channel delay spread is short. For an MMSE receiver, MB shows a 1-2.5 dB improvement over ML on the packet error rate performance for TGn channels B and D for various modulation and coding schemes. TDT is a simplified version of MB and shows a 1-2 dB improvement over ML at low SNRs. But improvements diminish when transmit beamforming is also employed.
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