{"title":"An improvement of UMTS LTE 64QAM performance","authors":"Helge Lüders, Andreas Minwegen, B. Eschbach, P. Vary","doi":"10.1002/ett.1421","DOIUrl":null,"url":null,"abstract":"In this contribution we investigate the performance of the universal mobile telecommunications system (UMTS) long-term evolution (LTE) physical layer using turbo coding and 64QAM with Gray mapping. We show how the mapping of systematic and parity bits to the six different bit positions defining one complex 64QAM symbol influences the convergence of the turbo decoder and thereby the bit error rate (BER) performance as well as number of necessary decoding iterations. Exploiting the unequal error protection (UEP) property of Gray mapped 64QAM results in an signal-to-noise ratio (SNR) performance gain of approximately 2 dB for the non-iterative system and leads to goodput gains especially in regions of low SNR. Copyright © 2010 John Wiley & Sons, Ltd.","PeriodicalId":50473,"journal":{"name":"European Transactions on Telecommunications","volume":"21 1","pages":"443-448"},"PeriodicalIF":0.0000,"publicationDate":"2010-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"European Transactions on Telecommunications","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1002/ett.1421","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 4
UMTS LTE 64QAM性能的改进
在这篇贡献中,我们研究了通用移动通信系统(UMTS)长期演进(LTE)物理层使用turbo编码和64QAM与灰度映射的性能。我们展示了系统和奇偶校验位到定义一个复杂64QAM符号的六个不同位位置的映射如何影响turbo解码器的收敛性,从而影响误码率(BER)性能以及必要的解码迭代次数。利用灰度映射64QAM的不等误差保护(UEP)特性,非迭代系统的信噪比(SNR)性能增益约为2 dB,特别是在低信噪比区域具有良好的增益。版权所有©2010 John Wiley & Sons, Ltd
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