Distributed Multi-Cell Power Allocation Algorithm for Energy Efficiency in OFDMA Relay Systems

The power allocation problem with co-channel interference is studied in multi-cell OFDMA cellular relay systems. Based on non-cooperative game theory and using a two-hop data rate balance, a distributed multi-cell power allocation (DMPA) algorithm is proposed, which reduces the transmission power cost and improves the system throughput. The non-cooperative power allocation game model is given in the first time subslot for base stations (BSs) and in the second time subslot for relay stations (RSs) respectively. Furthermore, the power is reduced by matching the data rate of the two-hop links for each RS. The simulation results of system throughput and transmission power of BS and RS are given with different numbers of users. Compared with equal power allocation on each subchannel, the system energy consumption is reduced and the throughput is improved.