Sciweavers

Share
GLOBECOM
2007
IEEE

Beamforming with Finite Rate Feedback for LOS MIMO Downlink Channels

9 years 24 days ago
Beamforming with Finite Rate Feedback for LOS MIMO Downlink Channels
— We consider a MIMO line of sight (LOS) broadcast channel where each user has perfect knowledge of its own channel and feeds back ‘quantized’ channel information to the transmitter with finite number of bits. The rate loss incured due to imperfect channel information at the transmitter is quantified in terms of the number of feedback bits, assuming that low-complexity zero-forcing beamforming is used by the transmitter. Moreover, in order to maintain a constant rate loss relative to a perfect CSIT system, it is shown that the number of feedback bits per user should grow linearly with the system SNR in dB but only logarithmitcally with the number of transmit antennas. Simulation results comparing zero-forcing, MMSE and conventional beamforming with greedy user selection and finite rate feedback are also presented.
Niranjay Ravindran, Nihar Jindal, Howard C. Huang
Added 02 Jun 2010
Updated 02 Jun 2010
Type Conference
Year 2007
Where GLOBECOM
Authors Niranjay Ravindran, Nihar Jindal, Howard C. Huang
Comments (0)
books