Optimal power allocation for non-regenerative relaying system based on STBC

A cooperative relaying system is presented to allow the application of multiple-input-multiple-output (MIMO) capacity enhancement techniques, such as space-time block codes (STBC), to mobile terminals (MT) with a limited number of antenna elements. The adaptive optimal power allocation (PA) scheme among relay stations (RS) is an important issue to achieve power efficiency and maximum performance improvement. This paper analyzes the non-regenerative (NR) relaying system based on the STBC technique, and investigates the optimal PA scheme between two non-regenerative RS under power constraint. Two receiving methods, with or without direct path signal, are also discussed in this paper. Numerical results indicate that compared with the uniform PA scheme, the proposed PA scheme can obtain the maximum instantaneous signal to noise ratio (SNR) and improve the system performance despite the RS´s position.