Cyclic delay transmission for unique word OFDM systems  

作　　者：LIAO Mang XIA XiangGen ZHANG YouGuang 

机构地区：[1]School of Electronic Information Engineering,Beihang University [2]Department of Electrical and Computer Engineering,University of Delaware

出　　处：《Science China(Information Sciences)》2014年第8期70-78,共9页中国科学（信息科学）（英文版）

基　　金：supported in part by the National Science Foundation (NSF) (Grant No.0964500);National Basic Research Program of China (Grant No.2010CB731803);National Science Foundation for Innovative Research Groups of China (Grant No.61221061)

摘　　要：In this article, we propose a cyclic delay diversity （CDD） transmission scheme for unique word （UW） OFDM system, which is denoted as CDD-UW-OFDM. In our proposed CDD-UW-OFDM system, the first transmit antenna transmits a UW-OFDM and then, for every UW-OFDM block, the i-th transmit antenna transmits a cyclically delayed version of the symbols transmitted at the first transmit antenna. With this proposed CDD-OFDM system, each antenna transmission is a UW-OFDM. Also, at the receiver under a certain condition on the cyclic delay amounts, the received signal is equivMent to that of a single transmit antenna UW-OFDM transmission with a longer multipath channel. We design the lengths of UW and cyclic delays to achieve the full multipath and spatial diversities for the CDD-UW-OFDM system when the linear MMSE receiver is used. We then present some simulation results to illustrate the claimed performance of the proposed system.In this article, we propose a cyclic delay diversity （CDD） transmission scheme for unique word （UW） OFDM system, which is denoted as CDD-UW-OFDM. In our proposed CDD-UW-OFDM system, the first transmit antenna transmits a UW-OFDM and then, for every UW-OFDM block, the i-th transmit antenna transmits a cyclically delayed version of the symbols transmitted at the first transmit antenna. With this proposed CDD-OFDM system, each antenna transmission is a UW-OFDM. Also, at the receiver under a certain condition on the cyclic delay amounts, the received signal is equivMent to that of a single transmit antenna UW-OFDM transmission with a longer multipath channel. We design the lengths of UW and cyclic delays to achieve the full multipath and spatial diversities for the CDD-UW-OFDM system when the linear MMSE receiver is used. We then present some simulation results to illustrate the claimed performance of the proposed system.

关 键 词：MIMO-OFDM systems frequency-selective fading channels cyclic delay diversity （CDD） uniqueword （UW） transmit diversity 

分 类 号：TN929.53[电子电信—通信与信息系统]