多载波码分多址系统在瑞利衰落信道中的性能分析  

Performance Study of Multi-Carrier CDMA Systems in Rayleigh Fading Channels

作　　者：黄颖[1] 张慧[1] 颜彪[1] 

机构地区：[1]扬州大学信息工程学院,江苏扬州225009

出　　处：《山西电子技术》2005年第6期5-6,22,共3页Shanxi Electronic Technology

摘　　要：多载波码分多址(MC-CDMA)是一种把多载波和CDMA相结合的技术方案。在MC-CDMA中,每个数据符号通过N个子载波传输,且根据扩频码对每个子载波以0或π相位偏移进行编码。分别研究了MC-CDMA系统上行链路和下行链路的瑞利衰落信道模型以及采用等增益组合和最大比组合的接收机模型,并对上行链路和下行链路的系统误码率性能进行了分析和计算。数值结果表明,MRC在上行链路中的性能要优于EGC,但在下行链路中的抗干扰性能不如EGC。Multi-carrier CDMA is a technical scheme that combining multi-cartier with CDMA where each data symhol is transmitted at multiple narrowband subcarriers. Each subcarrier is coded with a phase offset of 0 or π based on a spreading code. Respectively, this paper examines the Rayleigh fading channel model of MC-CDMA systems in uplink and downlink and the receiver modal that with the using of Equal Gain Combining （EGC） and Maximum Ratio Combining （MRC）. Bit Error Rate （BER） performance of the systems in uplink and downlink is analyzed and calculated. Numerical results show that MRC performs better than EGC in the uplink but it appears less effective in combating interference in the downlink.

关 键 词：多载波码分多址 正交频分复用 瑞利衰落 误码率 

分 类 号：TN911.3[电子电信—通信与信息系统] TN914.53[电子电信—信息与通信工程]