Joint Multiple Symbol Differential Detection and Channel Decoding for Noncoherent UWB Impulse Radio by Belief Propagation
Joint Multiple Symbol Differential Detection and Channel Decoding for Noncoherent UWB Impulse Radio by Belief Propagation
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DOI：
10.1109/twc.2016.2623301
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发表时间：
2015-04
影响因子：
10.4
通讯作者：
Taotao Wang;Tiejun Lv;Hui Gao;Shengli Zhang
中科院分区：
文献类型：
--
作者：
Taotao Wang;Tiejun Lv;Hui Gao;Shengli Zhang
本文提出了一种基于置信传播（BP）消息传递算法的联合多符号差分检测（MSDD）和信道解码方案，用于非相干差分超宽带脉冲无线电（UWB-IR）系统。 MSDD是提高非相干差分UWB-IR系统性能的有效手段。为了优化整体检测和解码性能，本文提出了一种用于非相干差分 UWB-IR 的新型软输入软输出（SISO）MSDD 方案。我们首先提出了一种新的非相干自相关接收器采样机制来对接收到的 UWB-IR 信号进行采样。所提出的采样机制可以利用整个数据包中的数据符号之间的依赖性（由差分调制施加）。信号概率模型具有隐马尔可夫链结构。我们使用因子图来表示这个隐马尔可夫链。然后，我们在因子图上应用BP消息传递算法来开发SISO MSDD方案，该方案很容易与SISO信道解码集成，形成联合MSDD和信道解码方案。误码率模拟和EXIT图表分析的性能结果表明我们的方案相对于之前的MSDD方案具有性能优势。
This paper proposes a belief propagation (BP) message passing algorithm-based joint multiple symbol differential detection (MSDD) and channel decoding scheme for noncoherent differential ultra-wideband impulse radio (UWB-IR) systems. MSDD is an effective means to improving the performance of noncoherent differential UWB-IR systems. To optimize the overall detection and decoding performance, this paper proposes a novel soft-in soft-out (SISO) MSDD scheme for noncoherent differential UWB-IR. We first propose a new sampling mechanism for the noncoherent auto-correlation receiver to sample the received UWB-IR signal. The proposed sampling mechanism can exploit the dependences (imposed by the differential modulation) among data symbols throughout the whole packet. The signal probabilistic model has a hidden Markov chain structure. We use a factor graph to represent this hidden Markov chain. Then, we apply BP message passing algorithm on the factor graph to develop an SISO MSDD scheme, which is easy to integrate with SISO channel decoding to form a joint MSDD and channel decoding scheme. Performance results of bit error rate simulations and EXIT chart analyses indicate the performance advantages of our scheme over the previous MSDD scheme.