A comparison of full and partial CSI opportunistic incremental relaying networks under power constraint

Abstract

Two  well-known  relay  selection  schemes including  full  relay  selection  (FRS)   or  partial  relay selection  (PRS)  have  been  proposed  for  opportunistic cooperative  networks.  Different  from  FRS  where channel state information (CSI) of the two hops is used, PRS employs only the  CSI of  the first hop to select  the best  relay,  which  significantly  reduces  the  complexity, thereby  extending  the  network  life-time.  In  this  paper, the  performance  comparison  of  the  opportunistic incremental  relaying  networks  installing  two  relay selection  schemes  is  reported.  Numerical  results  show that  at  low  signal-to-noise  ratios  (SNRs),  FRS outperforms PRS; However, at high SNRs, both of them approach to  a limit, which is determined by the quality of  the  direct  link  between  the  source  and  the destination.