哈尔滨工程大学学报2009，Vol.30Issue(10)：1165-1169,5.DOI:10.3969/j.issn.1006-7043.2009.10.015
认知无线电中OFDM多用户频谱分配
Multi-user OFDM spectrum allocation for cognitive radio
摘要
Abstract
Cognitive Radio (CR) is intended to improve spectrum utilization, reduce power needs and guarantee quality of service (QoS). Two algorithms using orthogonal frequency division multiplexing (OFDM) were proposed after reviewing research on spectrum allocation in multi-user CR. The 'optimal' algorithm obtains the total transmission power through the lower limit of primary users' signal to interference ratio (SIR), and allots every user sub-carriers and power according to Lagrange's theorem. The 'hypo-optimal' algorithm uses a prorating gene to deter mine equity of allocation. Results are obtained through restricting the users' SIR. Simulations showed both algorithms are effective, with the 'optimal algorithm' providing about a 35% improvement in channel capacity when compared with frequency division multiple access (FDMA) allocation. The capacity of the 'hypo-optimal' algorithm decreased slightly, but the QoS of users was guaranteed. Both algorithms satisfy the needs of CR, while using different approaches.关键词
认知无线电/OFDM/频谱分配/比例公平Key words
cognitive radio/ OFDM/ spectrum allocation/ proportion equity分类
信息技术与安全科学引用本文复制引用
刘鑫,谭学治..认知无线电中OFDM多用户频谱分配[J].哈尔滨工程大学学报,2009,30(10):1165-1169,5.基金项目
"973计划"基金资助项目(2007CB310601). （2007CB310601）
