Joint Detection and CFO Estimation for QAM Constellations
Joint Detection and CFO Estimation for QAM Constellations
复制标题
QAM 星座的联合检测和 CFO 估计
DOI：
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发表时间：
2011
期刊：
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通讯作者：
F. Nunes
中科院分区：
文献类型：
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作者：
P. Pedrosa;R. Dinis;F. Nunes
在本文中，我们提出了在严重时间弥散和中等载波频偏(CFO)的信道中使用QAM星座，特别是4，16和-QAM。我们考虑SC-FDE(单载波频域均衡)，并假设在均衡过程之前执行粗略的CFO估计和补偿。由于粗略的CFO估计会有很大的误差，从而导致剩余的CFO，为了保证良好的误码率，我们提出并评估了一种联合检测和载波同步的接收机。我们使用频域迭代DFE(判决反馈均衡)接收机，其表示为IB-DFE(迭代块判决反馈均衡)，它与DD(判决导向)CFO估计器相结合。我们的目标是确定4、16和-QAM的同步要求，并比较使用这些QAM星座时用于DDCFO估计器的几种方法。
In this paper we propose the use of QAM constellations, specifically 4, 16, and 64-QAM, in severely time-dispersive channels and with moderate CFOs (Carrier Frequency Offsets). We consider an SC-FDE (Single Carrier Frequency-Domain Equalization) and assume that previously to the equalization procedure a coarse CFO estimation and compensation is performed. Since the coarse CFO estimate can have a significant error leading to a residual CFO we present and evaluate a receiver with joint detection and carrier synchronization in order to guarantee a good BER. We employ frequency-domain iterative DFE (Decision Feedback Equalization) receivers denoted by IB-DFE (Iterative Block-Decision Feedback Equalization), which are combined with a DD (Decision-Directed) CFO estimator. Our aim is to determine the synchronization requirements for 4, 16, and 64-QAM and compare several methods for the DD CFO estimators when using these QAM constellations.