On Unitary Beamforming for MIMO Broadcast Channels

Sebastian Wagner (1) , Stefania Sesia (2) , Dirk Slock (1)

1 Eurecom [Sophia Antipolis]
2 ST-Ericsson [Le Mans]

In this paper we compare general unitary beamforming to constant modulus unitary beamforming in terms of achievable sum-rate for MIMO broadcast channels. We give a complete analysis of both schemes in the $2\times 2$ multi-user MISO configuration. Furthermore, we study the regime of asymptotically high signal-to-noise ratio. For growing number of transmit antennas the sum-rate gap between both schemes is significantly increasing. Simulations are carried out that corroborate our analytical results.

Domaines: Réseaux et télécommunications [cs.NI]

Sebastian Wagner, Stefania Sesia, Dirk Slock. On Unitary Beamforming for MIMO Broadcast Channels. IEEE International Conference on Communications, May 2010, Cape Town, South Africa. pp.1 - 5, ⟨10.1109/ICC.2010.5502119⟩. ⟨hal-00675521⟩