Non-uniform signal constellation for iteratively decoded bit interleaved coded modulation (BICM-ID) with convolution and LDPC codes

Tarek Arafa, W. Sauer-Greff, R. Urbansky
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引用次数: 2

Abstract

Bit interleaved coded modulation with iterative demapping and decoding (BICM-ID) is an effective technique to achieve high spectral efficiency with performance close to capacity limits. However, the use of non-uniform signal constellation following a Gaussian distribution instead of conventional equiprobable signaling provides a further improvement, i.e. shaping gain. In this paper, we investigate the effect of nonuniform constellation on the performance of BICM-ID systems with different forward error correction (FEC) coding schemes such as convolution code and low-density parity-check (LDPC) code as outer code. Simulation results show that the non-uniform constellations can offer a shaping gain up to 0.21 dB.
基于卷积码和LDPC码的迭代译码位交错编码调制(BICM-ID)的非均匀信号星座
比特交织迭代解映射解码编码调制(BICM-ID)是实现高频谱效率和性能接近容量极限的有效技术。然而,使用遵循高斯分布的非均匀信号星座代替传统的等概率信号提供了进一步的改进,即整形增益。本文研究了采用卷积码和低密度奇偶校验码作为外码的前向纠错(FEC)编码方案时,非均匀星座对BICM-ID系统性能的影响。仿真结果表明,非均匀星座可提供高达0.21 dB的整形增益。
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