Reduced complexity maximum likelihood detection for DAPSK based relay communication systems

M. Kanthimathi, R. Amutha
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引用次数: 7

Abstract

We propose a reduced complexity maximum likelihood detection technique for coded 16 level differentially encoded amplitude phase shift keying modulation in amplify-and-forward relaying system. This method eliminates the need for pilot symbols for channel estimation, equalization and there is no need for accurate phase tracking at the receiver which is particularly important in Relay aided cooperative system. This DAPSK based non-coherent differential detection method is spectrally efficient and more robust to non linear distortion. Our Simulation results demonstrate that the proposed method exhibits lower detection complexity and achieves approximately 3 dB gain at high SNR for a BER of 10-3 when compared to diversity combiner based detector and hard limiter based detection technique.
降低了基于DAPSK中继通信系统的最大似然检测的复杂性
提出了一种降低复杂度的最大似然检测技术,用于放大转发中继系统中编码16级差分编码幅度相移键控调制。该方法不需要导频符号进行信道估计和均衡,也不需要在接收端进行精确的相位跟踪,而这在中继辅助协同系统中尤为重要。这种基于DAPSK的非相干差分检测方法频谱效率高,对非线性失真具有较强的鲁棒性。仿真结果表明,与基于分集组合器的检测器和基于硬限幅器的检测技术相比,该方法具有较低的检测复杂度,并且在BER为10-3的高信噪比下获得约3 dB增益。
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