| OFDM系统改进的迭代联合信道估计与符号检测算法 |
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| 引用本文： | 韩冰,高西奇,尤肖虎.OFDM系统改进的迭代联合信道估计与符号检测算法[J].东南大学学报,2003,19(2). |
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| 作者姓名： | 韩冰 高西奇 尤肖虎 |
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| 作者单位： | 东南大学移动通信国家重点实验室 南京210096
(韩冰，高西奇)，东南大学移动通信国家重点实验室 南京210096(尤肖虎) |
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| 基金项目： | TheNationalHiTechDevelopmentPlan(2 0 0 1AA12 30 15 ) |
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| 摘 要： | 在正交频分复用 (OFDM)无线通信系统中 ,系统的吞吐量和数据速率受到导频因素的制约 ,这种情况在高速移动环境下尤为明显 .本文提出了一种改进的迭代联合信道估计与符号检测算法 ,以提高系统的吞吐量和数据速率 .首先降低导频功率来提高系统的吞吐量 ,然后在一个OFDM符号内 ,通过迭代进行的信道估计与符号检测来提高系统的误码率 .每个OFDM符号的初始信道估计值取自上一个OFDM符号的信道估计 ,从而该算法能有效地跟踪衰落信道的变化 ,因此导频的数目可以大大降低 .仿真结果显示 ,与传统的迭代算法相比 ,本文提出的算法能提供更好的误码性能 .
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| 关 键 词： | OFDM 信道估计 迭代 多径衰落信道 |
An enhanced iterative joint channel estimation and symbol detection algorithm for OFDM systems |
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| Han Bing,GAO XiQi,You Xiaohu.An enhanced iterative joint channel estimation and symbol detection algorithm for OFDM systems[J].Journal of Southeast University(English Edition),2003,19(2). |
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| Authors: | Han Bing GAO XiQi You Xiaohu |
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| Abstract: | For orthogonal frequency division multiplexing (OFDM) wireless communication, the system throughput and data rate are usually limited by pilots, especially in a high mobility environment. In this paper, an enhanced iterative joint channel estimation and symbol detection algorithm is proposed to enhance the system throughput and data rate. With lower pilot power, the proposed scheme increases system throughput firstly, and then the channel estimation and symbol detection proceed iteratively within one OFDM symbol to improve the BER performance. In the proposed algorithm, the original channel estimate of each OFDM symbol is based on the channel estimate of the previous OFDM symbol, thus the variation of the mobile channel is traced efficiently, so the number of pilots in the time domain can be reduced greatly. Besides reducing the system overhead, the proposed algorithm is also shown by simulation to give much better BER performance than the conventional iterative algorithm does. |
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| Keywords: | OFDM channel estimation iteration multipath fading channel |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
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