主速率ISDN网格码性能研究

Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI:10.1109/ICC.1994.368808

A. Khalifa, S. Ahamed

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引用次数: 0

摘要

栅格编码结合了信道编码和调制技术，用于在带限制信道上进行数据传输。理论上，它比传统的无编码多电平调制实现了显著的编码增益，而不影响带宽效率。作者研究了栅格编码算法的效果，并评估了它们在存在不完全回波消除器的载波服务区(CSA)环路环境下对主速率ISDN应用的有效性。本文采用一种基本方法对QAM簇的网格编码进行仿真。研究了栅格编码对16和64-QAM的影响。给出了编码的16 qam和64 qam星座在3个典型环路下60 dB回波抵消的结果。网格编码对整个PCSA(伪CSA)环种群的影响也被提出

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Performance of trellis codes for primary rate ISDN

Trellis code combines channel coding and modulation techniques for data transmission over band limited channels. Theoretically, it achieves significant coding gains over conventional uncoded multilevel modulation without compromising bandwidth efficiency. The authors study the effect of trellis encoding algorithms, and evaluate their effectiveness for the carrier serving area (CSA) loop environment in the presence of imperfect echo cancelers, for primary rate ISDN application. A basic methodology for the simulation of trellis codes for QAM clusters is utilized. The effect of trellis codes for 16and 64-QAM is studied. Results for the coded 16- and 64-QAM constellations for three typical loops with 60 dB of echo cancellations are presented. The effect of trellis codes on the entire PCSA (pseudo CSA) loop population is also presented.<>

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Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications

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