An Adaptive Allocation Algorithm for Multiuser OFDM System over Frequency Selective Fading Channels

QIAN Xue-rong; YUE Dian-wu; ZHANG Li-jun

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An Adaptive Allocation Algorithm for Multiuser OFDM System over Frequency Selective Fading Channels

更新时间：2025-07-16

- An Adaptive Allocation Algorithm for Multiuser OFDM System over Frequency Selective Fading Channels
- Acta Electronica Sinica Vol. 30, Issue 4, Pages: 508-511(2002)
- 作者机构：
  
  南京邮电学院通信工程系,江苏,南京,210003
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN929.5
- Published：2002
- 稿件说明：
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QIAN Xue-rong, YUE Dian-wu, ZHANG Li-jun. An Adaptive Allocation Algorithm for Multiuser OFDM System over Frequency Selective Fading Channels[J]. Acta Electronica Sinica, 2002, 30(4): 508-511.
DOI：

QIAN Xue-rong, YUE Dian-wu, ZHANG Li-jun. An Adaptive Allocation Algorithm for Multiuser OFDM System over Frequency Selective Fading Channels[J]. Acta Electronica Sinica, 2002, 30(4): 508-511. DOI：

摘要

本文提出一种适用于多径频率选择性衰落信道中多用户OFDM系统的自适应分配算法.算法根据信道瞬时估计值

自适应地为多用户分配子信道和传输比特数

在给定误比特率的条件下

使系统总的发送功率达到最小.作者根据时分复用的基本思想

提出多用户最佳子信道和比特分配算法

导出系统最小发送功率的下限

并在此基础上

进一步提出次佳自适应分配算法.数值模拟表明:次佳算法所需的发送功率比下限值高约1dB;与等比特分配方案相比自适应分配算法可节省功率约3-4dB;与静态信道分配方案相比

自适应分配算法可节省功率6-8dB.

Abstract

In this paper

an adaptive allocation algorithm for multiuser Orthogonal Frequency Division Multiplexing (OFDM) system over multipath frequency selective fading channels is proposed.According to the estimation of instantaneous channel characteristics

the adaptive allocation algorithm assigns the subchannels and bits for multiuser in the system to minimize the total transmission power for a given bit error rate (BER).Firstly

we apply the conception of time division multiplexing to the system to propose an optimum subchannel and bit rate allocation algorithm for multiuser

which results a low bound of the transmission power in the system.Then

a suboptimum adaptive allocation algorithm is proposed.The numerical simulation shows that the transmission power determined by the suboptimum adaptive allocation algorithm is 1dB bigger than that of the low bound;3-4dB less than that in equal bit allocation (EBA) and 6-8dB less than that in static subchannel allocation (SSA).

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