| 摘要: |
| 提出了一种使用块最小均方自适应滤波器进行信号合并的方案，适用于多载波码分多址（MC-CDMA）系统。在瑞利慢衰落信道下，只需要少量的训练符号就可以最大限度地消除信道噪声干扰和多址接入干扰。仿真结果表明，在一个满负荷的下行链路中，块最小均方自适应合并的性能接近非自适应的最小均方误差合并（MMSEC）；而在轻负荷（由激活用户数衡量）的情况下，性能优于MMSEC。 |
| 关键词: 多载波码分多址 最小均方滤波器 块自适应滤波器 瑞利衰落 |
| DOI：10.3969/j.issn.1001-893X. |
| Received:May 09, 2005Revised:October 06, 2005 |
| 基金项目:国家自然科学基金;国家高技术研究发展计划(863计划);国家高技术研究发展计划(863计划) |
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| Block Least Mean Square Adaptive Combining for MC-CDMA Systems |
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| Abstract: |
| This paper proposes a block least mean square adaptive combining scheme for MC-CDMA systems.In Rayleigh slow fading channel,channel noise and MAI(multiple access interference) is canceled to the full extent at the cost of only tens of training symbols.Simulation shows that the downlink performance of block least mean square adaptive combining is close to non-adaptive MMSEC(minimum mean square error combining) in a fully loaded system.Moreover,when the load is small(as measured by number of active users),the adaptive scheme is shown to outperform MMSEC. |
| Key words: multicarrier code division multiple access(MC-CDMA),least-mean-square(LMS) filter,block-adaptive filter,Rayleigh fading, |
