Asynchronous cooperative communication systems:A survey on signal designs  

作　　者：WANG HuiMing 1,2 & XIA XiangGen 3 1 School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an 710049,China 2 State Key Laboratory of Integrated Services Networks, Xidian University,Xi’an 710049, China 3 Department of Electrical and Computer Engineering,University of Delaware,Newark,DE 19716,USA 

出　　处：《Science China(Information Sciences)》2011年第8期1547-1561,共15页中国科学（信息科学）（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grants No.61071125,60971113);the Research Fund for Doctoral Program of Higher Education of China(Grant No.200806980020);the Science Foundation for Innovation Research Group of China(Grant No.60921003);the National Science Foundation(NSF)(Grant No.CCF-0964500);the World Class University(WCU)Program;National Research Foundation,Korea

摘　　要：Cooperative communications is a promising technique for future high speed wireless communications.These systems may be formulated as virtual multi-input multi-output （MIMO） systems where spatial/cooperetive diversity is a key advantage. However,different from MIMO systems,one of the major chal- lenges for cooperative communications systems is that the cooperative transmissions in cooperative systems may be neither time nor frequency synchronized,since the transmissions are from multiple cooperative nodes at different locations.The existing signal designs for co-located MIMO systems may not be able to collect the cooperative diversity in cooperative communications systems.This paper gives an overview of recent research efforts on combating the time and frequency asynchronism of the cooperative communication network.We focus on the signal designs （or space-time codings/modulations） to achieve full cooperative diversity,and summarize some of the resent distributed space-timing coding and space-frequency coding techniques to combat timing errors and frequency offsets,and in the meantime to achieve full cooperative diversity,in both one-way and two-way cooperative networks.Cooperative communications is a promising technique for future high speed wireless communications.These systems may be formulated as virtual multi-input multi-output （MIMO） systems where spatial/cooperetive diversity is a key advantage. However,different from MIMO systems,one of the major chal- lenges for cooperative communications systems is that the cooperative transmissions in cooperative systems may be neither time nor frequency synchronized,since the transmissions are from multiple cooperative nodes at different locations.The existing signal designs for co-located MIMO systems may not be able to collect the cooperative diversity in cooperative communications systems.This paper gives an overview of recent research efforts on combating the time and frequency asynchronism of the cooperative communication network.We focus on the signal designs （or space-time codings/modulations） to achieve full cooperative diversity,and summarize some of the resent distributed space-timing coding and space-frequency coding techniques to combat timing errors and frequency offsets,and in the meantime to achieve full cooperative diversity,in both one-way and two-way cooperative networks.

关 键 词：cooperative communications time and frequency offsets space-time coding space-frequency codes full cooperative diversity linear receiver 

分 类 号：TN914[电子电信—通信与信息系统] TN957.51[电子电信—信息与通信工程]