一种新型多载波传输方式的研究  

Research on a novel multi-carrier transmission scheme

作　　者：冯琳[1] 陆阳[1,2] 魏振春[1,2] 李超[1] 

机构地区：[1]合肥工业大学计算机与信息学院,合肥230009 [2]安全关键工业测控技术教育部工程研究中心,合肥230009

出　　处：《电子测量与仪器学报》2012年第11期953-959,共7页Journal of Electronic Measurement and Instrumentation

基　　金：教育部博士点基金(编号:20100111110004)资助项目;江苏省自然科学基金(编号:BK2011236)资助项目;安徽省自然科学基金(编号:1208085QF113)资助项目;广东省产学研(编号:2010B090400332;2011B090400457)资助项目;安徽省国际科技合作计划项目(编号:10080703001)资助项目;合肥工业大学自主创新项目(编号:2010HGZY0002;2012HGZY0015)资助项目

摘　　要：传统正交频分复用(OFDM)系统利用各个子载波之间的正交性来区分各路信号,且各个子载波之间的最小频率间隔在信号频谱上满足奈奎斯特准则,若进一步减小最小频率间隔,子载波之间正交性遭到破坏,会引入相当严重的载波间干扰。针对子载波频率间隔小于OFDM信号最小频率间隔的情况,提出将各个子载波进行Gram-Schmidt正交化转化为相互正交的波形,这样在加性高斯白噪声信道上传输,所占的频谱宽度比传统OFDM信号要窄,即频谱效率提高,并且误码性能不会恶化。信息论中脏纸编码对这种信号处理方法提供了理论依据,仿真结果也验证了上述方法的正确性。Conventional orthogonal frequency division multiplexing （OFDM） system utilizes the orthogonality among sub-carriers to distinguish each symbol modulated on the corresponding sub-carrier and the minimum frequency span should satisfy the Nyquist criterion in frequency domain. If the minimum frequency span in OFDM is reduced more, the orthogonality among sub-carders is destroyed and considerable inter carder interference is introduced. For this case, Gram-Schmidt orthogonalization procedure is proposed to translate the non-orthogonal sub-carriers into orthogonal waveforrn, such that if transmitted in additive white Gaussian noise channel, the bit error rate is not deteriorated and the bandwidth is smaller than that of conventional OFDM, i.e., the spectral efficiency is increased. Gram-Schmidt orthogo- nalization procedure used here can also be explained by dirty paper coding in information theory. In addition, simulation results also validate the correctness of the signal processing method above.

关 键 词：正交频分复用 Gram—Schmidt正交化程序 脏纸编码 

分 类 号：TP393[自动化与计算机技术—计算机应用技术] TN92[自动化与计算机技术—计算机科学与技术]