Compressive sensing based detector for sparse signal modulation in precoded OFDM
Compressive sensing based detector for sparse signal modulation in precoded OFDM
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DOI：
10.1109/icc.2015.7249037
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发表时间：
2015-06
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通讯作者：
Jinho Choi;Y. Ko
中科院分区：
文献类型：
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作者：
Jinho Choi;Y. Ko
本文提出了一种适用于预编码正交频分复用（OFDM）系统的稀疏信号调制（SSM）方法，并研究了信号检测问题。虽然接收器能够利用OFDM中的随机预编码来利用路径分集增益，但是接收器的复杂度通常很高，因为由于预编码而没有保持正交性。然而，使用SSM，我们可以得到一个低复杂度的检测器，该检测器可以基于压缩感知（CS）的概念以低稀疏比提供相当好的性能。CS检测器的一个重要特征是它可以利用子载波上的一小部分接收信号来估计SSM信号。该功能使我们能够使用少量解调器构建低成本接收器。
In this paper, we propose a sparse signal modulation (SSM) method for precoded orthogonal frequency division multiplexing (OFDM) systems and study the signal detection. Although a receiver is able to exploit a path diversity gain with random precoding in OFDM, the complexity of the receiver is usually high as the orthogonality is not retained due to precoding. However, with SSM, we can derive a low-complexity detector that can provide reasonably good performances with a low sparsity ratio based on the notion of compressive sensing (CS). An important feature of a CS detector is that it can estimate SSM signals with a small fraction of the received signals over sub-carriers. This feature can allow us to build a low cost receiver with a small number of demodulators.