宽带分布式协作频谱感知与协作传输机理研究

项目名称： 宽带分布式协作频谱感知与协作传输机理研究

项目编号： No.61301100

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 吴宣利

作者单位： 哈尔滨工业大学

项目金额： 26万元

中文摘要： 本项目针对未来无线通信终端是多模终端这一场景，考虑现有频谱感知方法存在的检测概率低、检测时间长、对授权用户干扰大以及认知用户传输效率下降等问题，提出联合网络编码和变换域处理的分布式宽带协作频谱感知及信息传输方法。通过认知用户采用Chirp化的信号，而授权用户采用传统正弦信号的传输方式，在接收时利用认知用户信号在分数域的能量聚集特性可以实现认知用户之间以及授权用户同认知用户的信号分离，以降低对授权用户的干扰；在此基础上协作认知用户使用网络编码来提高认知用户的传输效率，同时还可以降低对授权用户的检测时间，提高检测概率。此外，通过研究认知用户发射波形的设计方法、多认知用户条件下的网络编码、复杂信道条件下的接收方法和信道估计方法，可以进一步提高宽带频谱感知的检测概率，降低检测时间和对授权用户的干扰，同时还可以在频谱感知的同时进行认知用户的信息传输，有效提高认知用户的信息传输效率。

中文关键词： 变换域处理；频谱感知；MIMO；频谱共享；协作

英文摘要： Aiming at the scenario that the terminal for future wireless communication systems is a multi-mode one, and in order to solve the problems of low detection probability and long detection time as well as large interference to authorized users and low transmission efficiency for cognitive users, a distributed broadband cooperative spectrum sensing and transmission system based on the joint use of network coding and transform domain processing is proposed. In this proposed method, Chirp signals with different parameters are used for cognitive users, and conventional communication system is used for authorized users, and then, in the receiver end, by utilizing the energy concentration property of Chirp signals in the fractional Fourier transform domain, cognitive users with different parameters and authorized users can then be separated, and hence, the interference to authorized users can be reduced. In addition, network coding is used by different cognitive users to improve the transmission efficiency of cognitive frequency bands and at the same time, decrease the detection time to authorized users and improve detection probability. Moreover, by analyzing the optimization design of transmitted waveforms to cognitive users, multi-user network coding method, receiver design and channel estimation algorithm in complex

英文关键词： transform domain processing；spectrum sensing;；MIMO；spectrum sharing；cooperation