A　Frequency－Diversity　Spread－Spectrum　Multiple　Access　System　with　Random　Signature　Sequences  

作　　者：Cao Yewen Xiang Haige(Peking University,Beijing 100871) 

出　　处：《通信学报》1995年第4期56-62,共7页Journal on Communications

摘　　要：ＡＦｒｅｑｕｅｎｃｙ－ＤｉｖｅｒｓｉｔｙＳｐｒｅａｄ－ＳｐｅｃｔｒｕｍＭｕｌｔｉｐｌｅＡｃｃｅｓｓＳｙｓｔｅｍｗｉｔｈＲａｎｄｏｍＳｉｇｎａｔｕｒｅＳｅｑｕｅｎｃｅｓＣａｏＹｅｗｅｎ；ＸｉａｎｇＨａｉｇｅ（ＰｅｋｉｎｇＵｎｉｖｅｒｓｉｔｙ，Ｂｅｉｊｉ...A new scheme for the spread-spectrum multiple access system named Frequency-Diversity Spread-Spectrum Multiple Access(FD-SSMA)system,is proposed.In this FDSSMA system,the same information will be modulated on a group of mutually orthogonal frequency components(carriers)with a random signature sequence at the same time,and it will be demodulated by a coherent receiver for every component and then incorporated(as if using frequency diversity)on the basis of this random sequence.The spectrum of the modulated signal is very close to that of a white-noise in a wider frequency band due to orthogonality for all frequency components and property of the random sequence,the system becomes a spread-spectrum one.The(Inverse) Fast Froier Transform(IFFT,FFT) can be applied in the system,which provides additional flexibility.The performance in an asynchronous mode,such as ability of multiusers,anti-interferences,is analyzed.

关 键 词：扩频通信 多路访问 频率分集 

分 类 号：TN914.42[电子电信—通信与信息系统]