Patent ID: 8577310
Filing Date: 2013-11-05
Classification: H04B

Abstract:
1. A method of operating a multi-output wireless transmitter, the method comprising: determining a precoded data stream in accordance with input data, the determining comprising, transmitting the precoded data stream on the multi-output wireless transmitter, wherein determining the precoded data stream further comprises: updating auxiliary variable W and solving the following optimization problem where H kk is a channel matrix from transmitter k (after the precoded data) to receiver k, K is a number of transmitters, H kl is a channel matrix from transmitter l (after the precoded data) to receiver k, H jj is a channel matrix from transmitter j (after the precoded data) to receiver j, H jk is a channel matrix from transmitter k (after the precoded data) to receiver j, Q k is a precoded transmit data covariance matrix of user k, Q l is a precoded transmit data covariance matrix of user l, {tilde over (Q)} k is a previous value for Q k , Q j is a precoded transmit data covariance matrix of user j, and p k is a power constraint of precoded data of user k, B k , represents received interference power from all receivers, I is an identity matrix and σ is a noise standard deviation.