cooperative communication, a new OPCSS-DF algorithm is proposed. The simulation results show that the proposed algorithm improves system performance and spatial diversity, which makes tቤተ መጻሕፍቲ ባይዱe range of applications of this algorithm wider. Secondly, based on Goodman's non-cooperative power control game, a new power control
I
南京邮电大学硕士研究生学位论文
摘要
关键词：认知无线电；协作通信；功率控制；非合作博弈；频谱共享；
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南京邮电大学硕士研究生学位论文
Abstract
Abstract
In recent years, wireless communication plays an increasingly important role in people's daily life and social development, which makes wireless communication technology develop at a high-speed. However, wireless communications rely on radio spectrum, the frequency as a kind of natural resources is very limited. The existing spectrum allocation method is unreasonable, which leads to the scarcity of spectrum resources and a very low utilization of licensed spectrum. Recently, cognitive radio (CR) technology becomes a research hot spot, which requires no fixed spectrum allocation and communicates in the free band through the perception of the surrounding electromagnetic environment, and then improved spectrum efficiency. It is considered as the best technology to solve those problems mentioned before. Power control technology is one of the key problems in CR and wireless communication. Reasonable adjustments to the user's transmit power can not only ensure the normal communication of primary users, but also meet the needs of CR users. Cooperative communication technology in recent years has developed fast, whose basic idea is that the users forward the information for each other in wireless network to obtain greater spatial diversity. In this paper, power control for cooperative communications based on CR system is studied to improve network throughput and achieve a better optimization of transmission power under the premise of primary users’ normal communication. Fairness among CR users should be considered too. The study comprises two parts, cognitive radio hardware and software. Works and innovations are as follows: The first part focuses on the use of power control technology to improve the performance of wireless communication systems. Firstly, based on the OPCSS algorithm and the Decode-and-Forward in
研究生签名：____________ 导师签名：____________ 日期：_____________
南 京 邮 电 大 学 硕士学位论文摘要
学科 、专业：工 学 、信号与信息处理 研 究 方 向：无线通信与信号处理技术
作
者：滕鸿飞
指导教师：杨震 教授
题
目：基于协作中继的认知无线电功率分配算法研究
III
南京邮电大学硕士研究生学位论文
Abstract
game algorithm suitable for CR system was proposed by improving the pricing function. The existence and uniqueness of the Nash equilibrium is proved too. The simulation results indicate that compared with several classical non-cooperative game algorithms the new algorithm not only reduces the transmission power efficiently and improves the user's income, but also shows a good convergence .Thus，it is suitable for CR system which has high demand of time-delay character. The second part is the research of cognitive radio hardware platform and the verification of theoretical results. The CR MAC layer communications union on hardware and software platform is designed and studied, the final test results show that the communications union works effectively, not only meets the needs of mobile station for multiple services, but also completes the performance indicators set initially. This paper lays a good foundation for the further research on cognitive radio. At the end, a summary is given and the future research directions are pointed out. Keywords: cognitive radio; cooperative communication; power control; non-cooperative game; spectrum sharing;
研究生签名：_____________ 日期：____________
南京邮电大学学位论文使用授权声明
本人授权南京邮电大学可以保留并向国家有关部门或机构送交论文的复印件和电子 文档；允许论文被查阅和借阅；可以将学位论文的全部或部分内容编入有关数据库进行检 索；可以采用影印、缩印或扫描等复制手段保存、汇编本学位论文。本文电子文档的内容 和纸质论文的内容相一致。论文的公布（包括刊登）授权南京邮电大学研究生院（筹）办 理。 涉密学位论文在解密后适用本授权书。
单位代码： 10293
密
级：
硕 士 学 位 论 文
论文题目： 基于协作中继的认知无线电功率
分配算法研究
学 姓 导 学 研 科 究 专 方
号 名 师 业 向
Y001090606 滕鸿飞 杨震 教授 信号与信息处理 无线通信与信号处理技术 工学硕士 2012 年 3 月
申请学位类别 论文提交日期
南京邮电大学学位论文原创性声明
本人声明所呈交的学位论文是我个人在导师指导下进行的研究工作及取得 的研究成果。尽我所知，除了文中特别加以标注和致谢的地方外，论文中不包 含其他人已经发表或撰写过的研究成果，也不包含为获得南京邮电大学或其它 教育机构的学位或证书而使用过的材料。与我一同工作的同志对本研究所做的 任何贡献均已在论文中作了明确的说明并表示了谢意。 本人学位论文及涉及相关资料若有不实，愿意承担一切相关的法律责任。
英文题目：Research on power control for cooperative communications based on cognitive radio system