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首页> 外文期刊>IEICE Transactions on Communications >A New Joint Estimation of Channels and the Number of Transmit Antennas for OFDM Systems with Antenna Diversity Employing Walsh Hadamard Codes
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A New Joint Estimation of Channels and the Number of Transmit Antennas for OFDM Systems with Antenna Diversity Employing Walsh Hadamard Codes

机译:具有Walsh Hadamard码的具有天线分集的OFDM系统的信道和发射天线数目的新联合估计

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摘要

We propose a new approach associated with the use of some selected sets of Walsh Hadamard codes for joint estimation of channels and the number of transmit antennas by employing only one OFDM pilot symbol. This allows transmit antenna diversity to be applied in systems which have a limited number of training symbols (preambles), e.g. HIPER-LAN/2. The proposed approach does not require any a priori knowledge about the number of transmit antennas, providing flexibility in the number of antennas to be used. In addition, adaptive scheme associated with the proposed approach provides more accurate estimations of the channels. The effectiveness of the proposed approach is evaluated through simulation. Results show that the proposed scheme provides significant improvement over previous channel estimation schemes and has almost the same performance as the ideal system with the full knowledge of the channel state information.
机译:我们提出了一种新方法,该方法与仅通过使用一个OFDM导频符号而使用一些选定的Walsh Hadamard码集来联合估计信道和发射天线的数量有关。这允许将发射天线分集应用于具有有限数量的训练符号(前同步码)的系统中,例如。高速局域网/ 2。所提出的方法不需要关于发射天线的数量的任何先验知识,从而提供了要使用的天线数量的灵活性。另外,与所提出的方法相关联的自适应方案提供了更准确的信道估计。通过仿真评估了该方法的有效性。结果表明,所提出的方案与先前的信道估计方案相比有显着改进,并且在完全了解信道状态信息的情况下,其性能几乎与理想系统相同。

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