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瑞利衰落下的空时频 (STF)分组编码OFDM系统 被引量：6

Space-time-frequency block coding over OFDM systems for rayleigh fading channels
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摘要 基于正交频分复用 (OFDM )系统 ,提出了一种发射分集方案———比特交织空时频 (BI STF)分组编码。其基本思路是 :应用子载波分群方法并选择合适的系统参数 ,将OFDM系统转化成分群OFDM (G OFDM ) ,对每个群分别进行空时频分组编码 (GSTFBC) ;在编码比特被重组和映射成GSTF分组编码前进行合理的比特交织 ,并按一定的规则分配给各个单群子载波进行酉星座旋转 (CR)预编码。随后讨论了该方案的频谱利用率和成对错误概率 (PEP)。仿真结果表明 ,同其它编码方案相比 ,提出的方案能在频率选择性瑞利衰落信道下获得最大的空间分集和频率分集增益 。 In this paper, a novel space time frequency code scheme-Bit interleaved space time frequency block coding (BI STFBC) being fit for orthogonal frequency division multiplexing (OFDM) systems is considered for frequency selective Raleigh fading channels. Combining subcarrier grouping with choosing appropriate system parameters, general OFDM system is converted into a set of group OFDM system, within which STF coding is considered. Code bits are bit wise interleaved across every grouping subcarrier before grouped and mapped to space time frequency code, followed the Unitary constellation rotating precodes. The spectral efficiency and pairwise error probability (PEP) is also considered. Compared with existing alternatives, the scheme can attain maximum space and frequency diversity with low decoding flexibility. Simulation results confirmed the effective of the proposed scheme.
作者 罗微 李少谦 吴诗其 邵怀宗
机构地区 电子科技大学通信学院信息所
出处 《电波科学学报》 EI CSCD 2003年第5期502-508,共7页 Chinese Journal of Radio Science
基金 国家自然科学基金资助项目 (No.6 0 2 72 0 0 9)
关键词 正交频分复用 发射分集 比特交织空时频 空时频分组编码 子载波分群 瑞利衰落信道 space time frequency block codes, OFDM, bit interleave, subcarrier grouping, unitary constellation rotating precodes, frequency selective rayleigh fading channels
分类号 TN911.22 [电子电信—通信与信息系统]
  • 相关文献

参考文献13

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  • 2邵怀宗,彭启琮,李玉柏.在OFDM系统中用导频符号进行信道估计的新方法[J].电波科学学报,2002,17(6):628-632. 被引量：21
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二级参考文献13

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共引文献27

同被引文献34

  • 1贺志强,王晓湘,吴伟陵.一种新的时变衰落信道下MIMO系统的功率分配与自适应调制算法[J].电子学报,2004,32(9):1556-1559. 被引量：10
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  • 5W Su, Z Safar, M Olfat, K J R Liu. Obtaining full-diversity space-frequency codes from space-time codes via mapping[J]. IEEE Transactions on Signal Processing (Special Issue on MIMO Wireless Systems), November 2003, 51 (11): 2905-2916.
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  • 10Chengyang Li and Sumit Roy. Subspace-based blind channel estimation for OFDM by exploiting virtual carriers[J]. IEEE Trans. Wireless Communication,2003,2(1) : 141-150.

引证文献6

二级引证文献11

电波科学学报
2003年 第5期

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