A Study on Transmit Beamforming at Source Node in MISO-SISO/MIMO-MIMO AF Relays
Kiyomi Naohito, Julian L. Webber, Toshihiko Nishimura, Takeo Ohgane, Yasutaka Ogawa · 2012
A cooperative relay has been studied as a method to improve transmission quality in wireless mesh networks and cellular systems. Multiple antenna elements at a source node enable adaptive beamforming and thus improve total performance of relay transmission. In this paper, we propose simple transmit beamforming at a source node when the source node has two or more antenna elements and knows all channel information in MISO-SISO/MIMO-MIMO amplify-and-forward relays with direct link and evaluate the packet error rate. The simulation results show that the proposed method achieves both low complexity and high performance.