电信科学 ›› 2010, Vol. 26 ›› Issue (12): 63-67.doi: 10.3969/j.issn.1000-0801.2010.12.019

• 研究与开发 • 上一篇    下一篇

认知无线网络中基于用户需求和频谱聚合的动态频谱分配

张华晶,徐少毅,乔晓瑜   

  1. 北京交通大学电子信息工程学院 北京100044
  • 出版日期:2010-12-15 发布日期:2010-12-15
  • 基金资助:
    国家科技重大专项基金资助项目;国家“863”计划基金资助项目

Dynamic Spectrum Allocation Algorithm Based on User Demands and Spectrum Aggregation in Cognitive Radio Networks

Huajing Zhang,Shaoyi Xu,Xiaoyu Qiao   

  1. School of Electronics and Information Engineering，Beijing JiaoTong University，Beijing 100044，China
  • Online:2010-12-15 Published:2010-12-15

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摘要：

认知无线电技术可以感知周围无线环境择机利用频谱空洞，从而达到提高频谱效率的目的。在认知无线电网络中，现有的频谱分配算法大部分是基于连续频谱分配并且没有考虑用户的需求。但是连续频谱分配会生成许多小于用户需求的频谱片段，这些频谱片段不能被充分利用，从而造成频谱浪费。本文基于图论提出了一种联合考虑用户需求和非连续频谱聚合的频谱分配算法。在该算法中，非连续的频谱片段被聚合以尽可能多地满足用户总需求，充分利用了小的频谱片段，避免了频谱浪费，从而提高频谱效率。

关键词: 认知无线网络, 频谱分配, 用户需求, 频谱聚合

Abstract:

Cognitive radio has been recently introduced to enhance the spectrum efficiency for it can use the hole of spectrum through sensing the surrounding wireless environment.Most of existing spectrum allocation algorithms for cognitive radio network （CRN）are based on continuous spectrum assignment and the user demands are not considered.For this reason，many small spectrum fragments that are smaller than the user demands are generated and these spectrum fragments can not be fully utilized which make a wasteful use of spectrum resources.In this paper，we introduce an improved spectrum allocation algorithm taking user requirements and discontinuous spectrum aggregation into consideration based on the graph-coloring theory.In the proposed algorithm，the discontinuous small spectrum fragments could be aggregated to meet the user demands as much as possible to enhance the spectrum efficiency.

Key words: cognitive radio, spectrum allocation, user demand, discontinuous spectrum

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