Beamforming applied to New Cooperative Decode-and-Forward Relay Schemes
Zahoor Ahmed, Jean‐Pierre Cances, Vahid Meghdadi · 2008
In this paper we study the application of beamforming techniques at relay stations to increase transmission rate by mitigating co-channel interferences. We consider the downlink between a Base Station (BS) and two Mobile Stations (MS) where the data are transmitted through two decode-and-forward Relay Stations (RS) concurrently using the same frequency channel. Beamforming applies precoding vectors at the RS to mitigate co- channel interferences. Doing this, each user receives its own data without interference which simplifies the user receiver design. We propose here two precoding strategies yielding to two different transmission protocols. We compare them in terms of transmission rate and we discuss their respective merits.