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首页> 外文期刊>IEEE Transactions on Information Theory >'Turbo DPSK' using soft multiple-symbol differential sphere decoding
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'Turbo DPSK' using soft multiple-symbol differential sphere decoding

机译：使用软多符号差分球面解码的“ Turbo DPSK”

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摘要

Coded interleaved differential M-ary phase-shift keying (M-DPSK) with iterative decoding, the so-called "Turbo DPSK," is known as a power-efficient transmission format. Due to the rotational invariance of DPSK, it particularly enables detection without channel state information (CSI). However, the soft-input soft-output (SISO) component decoder for DPSK is the computational bottleneck if performance close to the ideal case of perfect CSI is desired. In this paper, we take a fresh look at SISO decoding without CSI and apply sphere decoding (SD) to reduce complexity. In particular, we devise a maximum a posteriori probability (MAP) multiple-symbol differential sphere decoder (MSDSD) which efficiently solves the high-dimensional search problem inherent to detection without CSI. Together with a soft-output generation device the MAP-MSDSD algorithm forms a new SISO-MSDSD module for iterative decoding. We analyze the extrinsic information transfer (EXIT) characteristic of the novel module, by means of which we are able to design powerful encoder and decoder structures. For, respectively, the additive white Gaussian noise (AWGN) and the continuously time-varying Rayleigh-fading channel without CSI these designs operate within 1.7-1.9 and 2.3-2.5 dB of channel capacity assuming perfect CSI. These figures compare favorably with results available in the literature, especially for reasonably high data rates of 1-2 bit/channel use. Simulation studies of the average and the maximum complexity required by SISO-MSDSD demonstrate the advantageous performance versus complexity tradeoff of our approach.
机译：具有迭代解码的编码交织差分M进制相移键控（M-DPSK），即所谓的“ Turbo DPSK”，被称为节能传输格式。由于DPSK的旋转不变性，它尤其可以在没有信道状态信息（CSI）的情况下进行检测。但是，如果需要性能接近理想CSI的理想情况，则DPSK的软输入软输出（SISO）组件解码器将成为计算瓶颈。在本文中，我们重新审视了没有CSI的SISO解码，并应用了球面解码（SD）来降低复杂度。特别是，我们设计了一种最大后验概率（MAP）多符号差分球面解码器（MSDSD），可以有效解决无CSI检测固有的高维搜索问题。 MAP-MSDSD算法与软输出生成设备一起构成了用于迭代解码的新SISO-MSDSD模块。我们分析了新型模块的外部信息传输（EXIT）特性，通过这种特性，我们能够设计出功能强大的编码器和解码器结构。分别针对加性高斯白噪声（AWGN）和不带CSI的连续时变瑞利衰落信道，假设理想的CSI，这些设计在信道容量的1.7-1.9和2.3-2.5 dB内工作。这些数字与文献中提供的结果相比具有优势，特别是对于使用1-2位/通道的较高数据速率的情况。 SISO-MSDSD所需的平均和最大复杂度的仿真研究表明，我们的方法在性能和复杂度之间取得了权衡。

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