Optimal Source - Power Splitting in Cooperative Relaying Communications
Jihyun Shin, Yunsung Choi, Dongwoo Kim
Progress in Signals and Telecommunication Engineering, Vol. 3, No. 1, 2014.
DOI: 
Link: http://www.dline.info/pste/fulltext/v3n1/3.pdf
Abstract:
In this paper, a usage of splitting source - node power is proposed for a two-phase cooperative relaying system where the transmit powers of the source and the relay node are individually constrained. In the proposed usage, the limited source power is divided into two parts that are used in the first and the second phase, respectively. Unlike conventional relaying methods, the source again in the second phase transmits its signal with the split power and, at the same time, the relay forwards the signal received at the first phase, which causes intervention between the signals. In order to avoid the intervention, so-called a co-phasing weight for aligning the phases of the two signals is used at at the source before the second transmission. The forwarding operation at the relay however is exactly the same to the conventional ones. Optimal power-splitting as well as the co-phasing weight is provided in this paper. With numerical investigation, the proposed powersplitting is shown to significantly reduce the outage probability compared with the conventional individual power allocation.