%0 Journal Article
%T Spectrum-Efficient Differential Space-Time Coded CDMA Systems<br>频谱有效的差分空时编码CDMA系统
%A Chen Zhong-lin
%A Zhu Guang-xi
%A Cai Wei
%A <br>陈钟麟
%A 朱光喜
%A 蔡玮
%J 电子与信息学报
%D 2005
%I 
%X In this paper, a spectrum-efficient differential space-time transmission scheme is presented for Code-Division Multiple-Access (CDMA) systems. Consider a multiuser environment with M synchronous co-channel users, each is equipped with 2 transmit antennas. Assuming the receiver uses N>2 receive antennas, this scheme will exploit decorrelating detectors and receive antenna diversity to separate M users. Then a noncoherent decoder is derived for flat Rayieigh fading channels, which can provide a minimum diversity order of 2x(jV-1) to each co-channel user. Compared with the existing differential space-time coded CDMA systems, the proposed scheme has two main advantages: Firstly, only by deploying an additional receive antenna, it can effectively improve the system performance under the condition that the spectrum efficiency is increased by 1/3; secondly, it has only linear decoding complexity.
%K Space-time code
%K Differential modulation
%K Multiuser interference
%K Interference suppression<br>空时码
%K 差分调制
%K 多用户干扰
%K 干扰抑制
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=EFC0377B03BD8D0EF4BBB548AC5F739A&aid=0FE6BB5FEB61CF84&yid=2DD7160C83D0ACED&vid=DB817633AA4F79B9&iid=0B39A22176CE99FB&sid=78F0EFE028BD3783&eid=4966445AEEBA9556&journal_id=1009-5896&journal_name=电子与信息学报&referenced_num=1&reference_num=12