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JSAC
2008

Limited feedback-based block diagonalization for the MIMO broadcast channel

8 years 5 months ago
Limited feedback-based block diagonalization for the MIMO broadcast channel
Block diagonalization is a linear precoding technique for the multiple antenna broadcast (downlink) channel that involves transmission of multiple data streams to each receiver such that no multi-user interference is experienced at any of the receivers. This low-complexity scheme operates only a few dB away from capacity but requires very accurate channel knowledge at the transmitter. We consider a limited feedback system where each receiver knows its channel perfectly, but the transmitter is only provided with a finite number of channel feedback bits from each receiver. Using a random quantization argument, we quantify the throughput loss due to imperfect channel knowledge as a function of the feedback level. The quality of channel knowledge must improve proportional to the SNR in order to prevent interference-limitations, and we show that scaling the number of feedback bits linearly with the system SNR is sufficient to maintain a bounded rate loss. Finally, we compare our quantizati...
Niranjay Ravindran, Nihar Jindal
Added 13 Dec 2010
Updated 13 Dec 2010
Type Journal
Year 2008
Where JSAC
Authors Niranjay Ravindran, Nihar Jindal
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