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首页> 外文期刊>IEEE Transactions on Communications >Pilot Symbol Parameter Optimization Based on Imperfect Channel State Prediction for OFDM Systems
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Pilot Symbol Parameter Optimization Based on Imperfect Channel State Prediction for OFDM Systems

机译：基于不完美信道状态预测的OFDM系统导频符号参数优化

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摘要

The optimization of pilot symbol parameters can improve the spectral efficiency of adaptive modulation for orthogonal frequency division multiplexing (OFDM) systems, since pilot symbols impose an overhead on the system consuming power and bandwidth. An optimal pilot symbol assisted adaptive modulation (PSAAM) scheme for OFDM systems is proposed that maximizes spectral efficiency by adapting the power and constellation size of each subcarrier based on employing imperfect channel state information (CSI) at the transmitter. The pilot symbol power and spacing is also optimized in this scheme. A suboptimum scheme that decreases computational complexity without perceivable loss in performance is also presented. The optimality of minimum mean square error (MMSE) channel prediction for OFDM systems expressed in terms of a lower bound on spectral efficiency is approached. It is proved that the rectangular pilot pattern with equi-spaced and equal power pilot tones achieves the minimum MSE of the channel prediction in addition to having the advantage of simplifying PSAAM design. Numerical results show the importance of optimal pilot parameter adjustment for rapidly fading channels.
机译：导频符号参数的优化可以提高正交频分复用（OFDM）系统的自适应调制的频谱效率，因为导频符号会给系统的功耗和带宽带来额外负担。提出了一种用于OFDM系统的最优导频符号辅助自适应调制（PSAAM）方案，该方案通过基于发射机处的不完美信道状态信息（CSI）来适应每个子载波的功率和星座图大小，从而使频谱效率最大化。在该方案中也优化了导频符号的功率和间隔。还提出了一种次优方案，该方案可降低计算复杂度而又不会造成性能上的损失。寻求以频谱效率的下限表示的OFDM系统的最小均方误差（MMSE）信道预测的最优性。事实证明，具有等间隔和等功率导频音的矩形导频图案，除了具有简化PSAAM设计的优势外，还可以实现信道预测的最小MSE。数值结果表明，对于快速衰落的信道，最优导频参数调整的重要性。

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