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首页> 外文期刊>Communications, IET >Improved superimposed training-based channel estimation method for closed-loop multiple input multiple output orthogonal frequency division multiplexing systems
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Improved superimposed training-based channel estimation method for closed-loop multiple input multiple output orthogonal frequency division multiplexing systems

机译：闭环多输入多输出正交频分复用系统的改进的基于训练的叠加信道估计方法

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摘要

This study pertains to the use of superimposed training (ST) in closed-loop multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. A novel method consisting of a technique to refine the channel estimate at the transmitter in an ST-based closed-loop MIMO-OFDM system is proposed. The estimate is refined at the transmitter by making use of the previous data that was transmitted. This significantly reduces the data interference in the channel estimate and hence improves performance. The mean squared estimation error (MSEE) of the refined channel estimate is mathematically analysed and it is shown that in the limit, the accuracy of the refined channel estimate is identical to the pilot-assisted case with the additional advantage of the bandwidth efficiency inherent in ST-based systems. Two factors in general affect all transmitter side techniques that make use of the fed back channel coefficients. One is the quantisation error affecting the channel estimate. The other is the channel variations that may render the fed back channel coefficients outdated for further use. The effect of these factors on the proposed refined channel estimation scheme is discussed in detail. Simulation results are presented in terms of the MSEE and the bit error rate performance demonstrating the usefulness of the proposed scheme.
机译：这项研究涉及在闭环多输入多输出（MIMO）正交频分复用（OFDM）系统中使用叠加训练（ST）。提出了一种新颖的方法，该方法由在基于ST的闭环MIMO-OFDM系统中完善发射机处的信道估计的技术组成。通过使用之前发送的数据，可以在发送器处完善估算值。这大大减少了信道估计中的数据干扰，从而提高了性能。对精炼信道估计的均方估计误差（MSEE）进行了数学分析，结果表明，在极限情况下，精炼信道估计的精度与导频辅助情况相同，另外还具有带宽固有的带宽效率优势。基于ST的系统。通常有两个因素影响所有利用反馈信道系数的发射机端技术。一种是影响信道估计的量化误差。另一个是信道变化，可能使反馈的信道系数过时以备将来使用。详细讨论了这些因素对提出的精炼信道估计方案的影响。仿真结果以MSEE和误码率性能表示，证明了所提方案的实用性。

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    《Communications, IET》 |2011年第2期|p.209-221|共13页
  • 作者

    Nair J.P.; Kumar R.V.R.;

  • 作者单位

    G.S. Sanyal School of Telecommunications, IIT Kharagpur 721302, India;

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