A Spectrally Efficient Transmission Scheme for Half-Duplex Decode-and-Forward Relaying

Majid Nasiri Khormuji, Erik G. Larsson
2007 IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference  
We propose a spectrally efficient transmission scheme for the half-duplex relay channel. In the proposed scheme, the relay combines N detected r-dimensional symbols and generates M new r-dimensional symbols, where M < N , using a linear transformation. The proposed linear transformation preserves the signal energy, and it facilitates decoupled symbol detection at the receiver. We also present an optimized design for the case of complex scalar modulation (r = 2) with N = 2 and M = 1. This design
more » ... increases the spectral efficiency by 33% compared to conventional decode-or amplify-and-forward relaying.
doi:10.1109/glocom.2007.320 dblp:conf/globecom/KhormujiL07 fatcat:trhax2c2xncndbpwv42netv6la