基于IEEE 802.11a的OFDM接收机信道估计研究

Huimei Yuan, Yingzhuan Ling, Hao-xiang Sun, Wen Chen
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引用次数: 9

摘要

信道估计对于抑制干扰和解复用信号非常重要。首先,建立了基于IEEE 802.11 a标准的OFDM接收系统结构。然后,重点研究了基于最小二乘的信道估计算法。结合ieee802.11 a协议序言帧的特点,利用帧序言中的两个长训练符号序列和带滤波器的去噪技术,提出了一种新的简便的信道估计方法。对该算法进行了均方误差(MSE)、解调数据星座图、误码率(BER)以及滤波后的性能等方面的仿真。结果表明,该方法能在一定程度上提高接收机的性能。最后,对基于IEEE 802.11a标准的整个收发系统的性能进行了仿真。测试结果表明,该OFDM接收系统的性能满足IEEE 802.11a标准的要求。进一步验证了OFDM接收机信道估计方法的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Research on channel estimation for OFDM receiver based on IEEE 802.11a
Channel estimation is very important for suppressing interference and de-multiplexing signals. First, the structure of OFDM receiver system based on IEEE 802.11 a is established. Then, least square (LS) based channel estimation algorithm is mainly studied. Combing with the character of the preamble frame in IEEE 802.11a protocol, by using of the two long training symbol sequences in the frame preamble and de-noising technology with filters, a novel simple method to estimate channel is proposed. Simulations are done to the algorithm on some aspects such as the mean square error (MSE), constellation map of the demodulated data, bit error rate (BER) and the performance after de-noising with filters. Results show that this method could enhance the performance of the receiver in a certain level. At last, performances of the whole transceiver system based on IEEE 802.11a standard are simulated. It can be concluded that the performance of the OFDM receiver system is able to meet the requirement of IEEE 802.11a standard. Furthermore, the results prove the validity of our research on OFDM receiverpsilas channel estimation.
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