| 摘要: |
| MIMO系统的大部分空时编码方法在设计时单一强调对传输分集性能或传输复用性能的提高,为了联合提高分集性能和复用性能,在LDC编码基础上提出了线性正交弥散空时码(OLDC),LDC编码的优化中利用遗传算法来构造OLDC的空时正交调制基矩阵.优化的编码方法设计简单,便于调制解调.仿真结果表明,OLDC码比传统的LDC编码在误码性能、分集性能、复用性能等方面均有大幅度提高. |
| 关键词: MIMO系统 线性弥散空时码 线性正交弥散空时码 分集增益 复用增益 遗传算法 |
| DOI：10.3969/j.issn.1001-893X. |
| Received:September 18, 2006Revised:January 10, 2007 |
| 基金项目: |
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| Optimized Design of Linear Dispersion Space-time Codes in MIMO System |
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| Abstract: |
| Most space-time codes of MIMO system only emphasize improving the performance of diversity gain or spatial multiplexing gain.For the joint diversity and multiplexing optimal MIMO transmitting,The orthogonal linear dispersion space-time code(OLDC) based on LDC is proposed.It uses genetic algorithm(GA) to construct space-time orthogonal base matrix of OLDC.Optimized coding method is simple in design,modulation and demodulation.Simulation results show that OLDC performs better than traditional LDC on BER,diversity and multiplexing capacity. |
| Key words: MIMO system,linear dispersion code(LDC),orthogonal linear dispersion code(OLDC),diversity gain,spatial multiplexing gain,GA |
