Interference Cancellation with Beamforming and Power Control in Cooperative Networks

Abstract

The interference cancellation (IC) technique for cooperative networks is investigated, if the relay and the destination are disturbed by the co-channel interference (CCI) from neighborhood system. In order to solve such interference problem, the beamforming algorithm with the appropriate weight estimation of the array smart antenna at the source (S), the power control technique at interfering source and signal combining algorithms at the destination (D). The maximum ratio combining (MRC) and the cooperative maximum ration combining (C-MRC) are used to combine the received signals arrived at D. We can also control the transmitted power at the source from interfering system, and maintain nearly the diversity gain compare with CCI and no CCI. Therefore, the proposed scheme achieves the maximum diversity gain and lower probability of error in comparison with the conventional decodeand- forward protocol (DF). And it is able to provide the power control strategy from interfering source to the relay and the destination nodes in order to achieve the minimum symbol error rate (SER) based on the experimental results from computer simulations.