| 一种降低垂直分层空时码球解码复杂度的自适应调制 |
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| 引用本文： | 龚政委,张太镒,张璟,汪烈军.一种降低垂直分层空时码球解码复杂度的自适应调制[J].西安交通大学学报,2007,41(6):655-659. |
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| 作者姓名： | 龚政委 张太镒 张璟 汪烈军 |
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| 作者单位： | 1. 西安交通大学电子与信息工程学院,710049,西安
2. 西安交通大学电子与信息工程学院,710049,西安;新疆大学信息学院,830046,乌鲁木齐 |
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| 摘 要： | 针对垂直分层空时码球解码算法复杂度高的问题，提出了一种新的基于部分信息反馈的自适应调制算法．该算法首先根据每个发送天线总功率增益，选择该天线所用星座图大小，保持每次传输的总码率恒定，然后调整码元解码顺序，减少球解码总的搜索结点数，对于不同调制方式的复信号点球解码算法，给出了不同的结点搜索方法．由于球解码查找树根结点的减少，避免了低自由度信道系数引起的额外搜索，因此降低了迭代搜索次数．仿真结果表明，对于3天线垂直分层码，3bit反馈信息使球解码的迭代次数降低了50％，而且提高了系统性能．
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| 关 键 词： | 球解码 解码复杂度 部分反馈 自适应调制 |
| 文章编号： | 0253-987X（2007）06-0655-05 |
| 修稿时间： | 2006-11-30 |
Novel Adaptive Modulation Reducing Sphere Decoding Complexity of Vertical Bell Labs Layered Space-Time |
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| Gong Zhengwei,Zhang Taiyi,Zhang Jing,Wang Liejun.Novel Adaptive Modulation Reducing Sphere Decoding Complexity of Vertical Bell Labs Layered Space-Time[J].Journal of Xi'an Jiaotong University,2007,41(6):655-659. |
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| Authors: | Gong Zhengwei Zhang Taiyi Zhang Jing Wang Liejun |
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| Abstract: | Focusing on the high sphere decoding(SD) complexity of vertical Bell labs layered space-time(VBLAST),a novel adaptive modulation(AM) algorithm based on partial feedback is proposed.According to the total power gain of each transmit antenna,the corresponding constellation size is selected and the invariant transmit rate is kept.Then,the symbol decoding sequence is adjusted to cut down the total searching nodes.Decreasing the root nodes helps to reduce the iterative searching of SD by avoiding some extra searching caused by the low freedom degree of channel coefficient.For different modulations(e.g.QAM and PSK) of complex-signal SD,different node searching schemes are derived.Simulation results demonstrate that for VBLAST over three transmit antennas,a three-bit feedback reduces a half of the iteration number of SD and enhances the system performance. |
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| Keywords: | sphere decoding decoding complexity partial feedback adaptive modulation |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
