Generalized Maximum Likelihood Noncoherent Block Detection for Decode-and-Forward Relay Systems  

作　　者：HE Yucheng QIAO Ying ZHOU Lin 

机构地区：[1]Institute of Communications Technology, National Huaqiao University, Xiamen, 361021, China

出　　处：《China Communications》2014年第4期163-171,共9页中国通信（英文版）

基　　金：ACKNOWLEDGMENT This work was supported by the National Science Foundation of China （61302095）, the Huaqiao University Science Foundations （13Y0384,12BS219）.

摘　　要：This paper considers noncoherent cooperative decode-and-forward(DF) halfduplex multi-branch relay systems.Each relay branch is modeled as a probabilistic transition system at the last hop,and thus it can be considered as a relaying chain comprising multi-hop relays.An approximation to the generalized maximum likelihood(ML) noncoherent block detection is derived for uncoded M-ary modulation in a faded noisy environment.In particular,the derived noncoherent block detection in a noiseless case is equivalent to a multichannel reception with full diversity.Furthermore,the generalized detection is extended specifically to block coded M-ary phase shift keying(MPSK) modulation.For a DF three node relay system using block coded quadrature phase shift keying(QPSK),simulation results are provided to examine the end-to-end error performance of the noncoherent detection with considering the effects of network geometry and power allocation,respectively.It is shown that under a fixed power allocation,a proper relay placement can yield near full diversity for large signal-to-noise ratio.This paper considers noncoherent cooperative decode-and-forward （DF） half- duplex multi-branch relay systems. Each relay branch is modeled as a probabilistic transition system at the last hop, and thus it can be considered as a relaying chain comprising multi-hop relays. An approximation to the generalized maximum likelihood （ML） noncoherent block detection is derived for uncoded M-ary modulation in a faded noisy environment. In particular, the derived noncoherent block detection in a noiseless case is equivalent to a multichannel reception with full diversity. Furthermore, the generalized detection is extended specifically to block coded M-ary phase shift keying （MPSK） modulation. For a DF three node relay system using block coded quadrature phase shift keying （QPSK）, simulation results are provided to examine the end-to-end error performance of the noncoherent detection with considering the effects of network geometry and power allocation, respectively. It is shown that under a fixed power allocation, a proper relay placement can yield near full diversity for large signal-to-noise ratio.

关 键 词：cooperative communications decode-and- forward MPSK noncoherent detection 

分 类 号：TN914.3[电子电信—通信与信息系统] TP360.3[电子电信—信息与通信工程]