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2007
IEEE

Opportunistic Feedback Protocol for Achieving Sum-Capacity of the MIMO Broadcast Channel

12 years 27 days ago
Opportunistic Feedback Protocol for Achieving Sum-Capacity of the MIMO Broadcast Channel
—This paper presents an opportunistic feedback (OF) protocol that achieves the asymptotic sum-capacity of the fading broadcast channel (BC) with a limited amount of feedback. The OF protocol associates a channel value instead of a user to each feedback slot. The users access the slots opportunistically based on their channel state measurement. This allows the base-station to deduce the channel state from the slot index without explicit channel-state feedback. This protocol is then extended to the MIMO BC by using zero-forcing beamforming and random beamforming. The OF protocol is analytically shown to (a) require finite number of feedback slots upper bounded by a small number, (b) be fully distributed, (c) need minimal transmission energy during feedback and (d) asymptotically achieve the sum-capacity of the MIMO BC. Comparison with other opportunistic feedback schemes shows that the proposed scheme has substantially larger sum-rate with a lower feedback overhead.
Rajiv Agarwal, Chan-Soo Hwang, John M. Cioffi
Added 04 Jun 2010
Updated 04 Jun 2010
Type Conference
Year 2007
Where VTC
Authors Rajiv Agarwal, Chan-Soo Hwang, John M. Cioffi
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