| 引用本文: | 李颖,魏急波,张炜.球形译码算法中不均匀半径分配方案及性能分析.[J].国防科技大学学报,2008,30(1):63-68.[点击复制] |
| LI Ying,WEI Jibo,ZHANG Wei.A Nonuniform Radius Assignment Scheme for Sphere Decoding and Performance Analysis[J].Journal of National University of Defense Technology,2008,30(1):63-68[点击复制] |
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| 球形译码算法中不均匀半径分配方案及性能分析 |
| 李颖1, 魏急波1, 张炜2 |
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(1.国防科技大学 电子科学与工程学院，湖南 长沙 410073;2.中国网通 烟台市分公司，山东 烟台 264000)
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| 摘要: |
| 在球形译码算法中，初始半径的选择与分配是影响算法性能与复杂度的重要因素。针对球形译码算法在低信噪比时复杂度高的问题，提出了一种新的基于V-BLAST信号模型的初始半径选择与（准）线性半径分配方案，并分析了应用该方案的两种典型球形译码算法流程的性能与复杂度，其分析方法适用于任意不均匀半径分配方案。分析与仿真表明，与传统的球形译码算法相比，在信噪比较低时，采用该方案的球形译码算法的复杂度显著降低；在较宽信噪比范围内，其误码率性能接近最大似然检测性能。 |
| 关键词: 球形译码 V-BLAST 最大似然检测 |
| DOI： |
| 投稿日期：2007-07-09 |
| 基金项目:十一五通信装备预研项目(5143505010) |
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| A Nonuniform Radius Assignment Scheme for Sphere Decoding and Performance Analysis |
| LI Ying1, WEI Jibo1, ZHANG Wei2 |
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(1.College of Electronic Science and Engineering, National Univ. of Defense Technology, Changsha 410073, China;2.Yantai Branch, China Netcom Corporation LTD.， Yantai 264000，China)
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| Abstract: |
| In the sphere decoding (SD) algorithm, the strategy of initial radius selection and assignment has significant impact on the performance and complexity of the algorithm. In order to reduce the prohibitive complexity of conventional SD algorithm at low signal-to-noise ratios (SNRs), a novel strategy of initial radius selection and (quasi-) linear assignment is proposed based on V-BLAST signal model. The method of analyzing the performance and complexity of SD algorithm applying the proposed scheme is suitable for any nonuniform radius assignment strategy. Analysis and simulation show that, compared with the conventional SD algorithm, the complexity is reduced significantly by the proposed scheme at low SNRs, and the bit-error-rate performance is close to that of maximum likelihood detection in a relatively large SNR range. |
| Keywords: sphere decoding V-BLAST (vertical-bell labs layered space-time) maximum likelihood detection |
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