Abstract:

An analytical model for power allocation based on multiple cooperative relays and multiple antennas at the destination in cooperative communication is presented. An optimal power allocation scheme (OPA), through singular value decomposition (SVD) of the channel matrix, is developed among the relay nodes under a certain power constraint to achieve the maximum channel capacity. The expression of the optimal power allocation coefficient is derived using Lagrange multiplier. Compared with the equal power allocation (EPA) scheme, the OPA can obtain higher capacity gain and outage probability gain.

Key words: cooperative communication, virtual MIMO, outage probability, optimal power allocation (OPA), equal power allocation (EPA)