认知无线电下行链路中OFDM多用户资源分配算法
Multiuser OFDM Resource Allocation Algorithm for Downlink Cognitive Radios
本文讨论了基于OFDM的认知无线电（Cognitive Radio，简写为CR）系统中下行链路的频谱共享算法。认知无线电用户能够根据感知的资源状况，针对用户的带宽、速率等要求，动态调整子载波和功率的分配。在保证每一个认知用户的传输速率时，如何优化系统总的发射功率呢？本文在不干扰授权用户通信的前提下，采用“两步法”进行了多用户之间的子载波及功率分配。首先提出了一种贪婪算法为每一个认知用户分配可用的频谱段，然后提出了一种功率分配算法。仿真结果表示了所提CR频率洞算法的总发射功率相对与FDMA有大幅度降低。
his paper investigates how to minimize total transmit power in a cognitive radio (CR) system while guaranteeing the transmission rate of each CR user. With attempt to solve the above problem, a greedy algorithm is presented to allocate the available spectrum segments to CR users at first, then a high efficiency power allocation algorithm based on the spectrum holes is proposed for the centralized downlink CR systems. Finally, the computer simulations show that the algorithm based on spectrum holes has higher power efficiency than the one based on FDMA.
刘罡、张然然、谢刚
无线通信通信电子技术应用
认知无线电OFDM资源分配频谱洞
ognitive Radio(CR)OFDMResource AllocationSpectrum Hole
刘罡,张然然,谢刚.认知无线电下行链路中OFDM多用户资源分配算法[EB/OL].(2008-11-25)[2025-08-02].http://www.paper.edu.cn/releasepaper/content/200811-707.点此复制
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