| 多用户OFDM系统中一种次最优多址接入方案 |
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| 引用本文： | 丁家昕,周正.多用户OFDM系统中一种次最优多址接入方案[J].北京邮电大学学报,2003,26(2):33-36,57. |
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| 作者姓名： | 丁家昕 周正 |
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| 作者单位： | 北京邮电大学 电信工程学院 , 北京 100876 |
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| 基金项目： | 信息产业部电子工业生产发展基金;20001077; |
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| 摘 要： | 给出了带自适应资源分配的多用户 OFDM系统的数学模型 ,指出理论上的最优接入算法是不可实现的 . 提出了一种易于实现的次最优多址接入方案 ,它以瞬时信道特性为基础 ,通过不断寻找局部最优以期达到或接近全局最优. 仿真实验表明 ,使用这种次优多址接入方案的多用户 OFDM 系统的性能明显优于使用各种静态多址接入方案的系统 .
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| 关 键 词： | 多用户OFDM系统 多址接入技术 自适应资源分配 |
| 文章编号： | 1007-5321(2003)02-0033-04 |
A Suboptimal Multiple Access Scheme for Multiuser OFDM System |
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| DING Jia-xin,ZHOU Zheng.A Suboptimal Multiple Access Scheme for Multiuser OFDM System[J].Journal of Beijing University of Posts and Telecommunications,2003,26(2):33-36,57. |
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| Authors: | DING Jia-xin ZHOU Zheng |
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| Affiliation: | Telecommunication Engineering School, Beijing University of Posts and Telecommunications, Beijing 100876, China |
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| Abstract: | A simple system model of multiuser OFDM with adaptive resources allocation is given, which can get the optimal access algorithm in theory. But the optimal scheme isn't realizable, so we present an realizable suboptimal algorithm that is based on the instantaneous characteristics of all the subchannels, it makes locally optimal choices at each step in the hope that these choices will produce a globally optimal solution or a close one. The results of simulation show that our proposed algorithm outperforms multiuser OFDM systems with static FDMA or CDMA techniques. |
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| Keywords: | multiuser OFDM system multiple access technology adaptive resources allocate |
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