04-07-2013 дата публикации
Номер: US20130170422A1
A method for a transmit precoder for multicast communication over a downlink in a wireless network, including: initializing a transmit precoder, a channel estimate for each user in the wireless network; updating for each user a receive filter and a slack matrix; updating the transmit precoder by solving a second order cone routine solvable in closed form; determining if a predetermined convergence is met; and outputting the updated transmit precoder responsive to the convergence criteria. 1. A method for a transmit precoder for multicast communication over a downlink in a wireless network , comprising the steps of:initializing a transmit precoder, a channel estimate for each user in said wireless network;updating for each said user a receive filter and a slack matrix;updating said transmit precoder by solving a second order cone routine solvable in closed form;determining if a predetermined convergence is met; andoutputting the transmit precoder responsive to said convergence criteria.2. The method of claim 1 , wherein said predetermined convergence ensures a monotonically non-decreasing objective across iterations.3. The method of claim 1 , wherein said receive filter comprises{'sub': k', 'k', 'k', 'N', {'sub2': 'k'}, 'k', 'k', 'k, 'sup': †', '†', '−1, 'G←(HWWH+I)HW where W denotes the transmit precoder, Hdenotes the channel seen by user k and Ndenotes the number of receive antennas at user k and d denotes the upper bound on the number of symbols (in the rank constraint)'}4. The method of claim 1 , wherein said slack matrix comprises{'sub': k', 'k', 'k', 'd', 'k', 'k, 'sup': †', '†, 'S←WHHW+I, where W denotes the transmit precoder, Hdenotes the channel seen by user k and Ndenotes the number of receive antennas at user k and d denotes the upper bound on the number of symbols in the rank constraint.'} This application claims priority to provisional application No. 61/535,636 filed Sep. 16, 2011, the contents thereof are incorporated herein by referenceThe present ...
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