Patent ID: 8068407
Filing Date: 2011-11-29
Classification: H04B,H04L

Abstract:
1. A method for decoding in a wireless downlink channel, where all dominant transmitting sources use inner codes from a particular set, comprising the steps of: estimating a channel matrix seen from each dominant transmitter source in response to a pilot or preamble signal transmitted by each such source; converting each estimated channel matrix into an effective channel matrix responsive to the inner code of the corresponding transmitting source; obtaining received signal observations in a linear equivalent form whose output is an equivalent of the received observations and in which the effective channel matrix corresponding to each dominant transmitting source inherits the structure of its inner code; i) determining an order for processing each of the transmitting sources comprising a decodability metric responsive to a decoupling property so that the number of operations involved in a computing are reduced; ii) computing a filter for each transmitting source that will be decoded; iii) demodulating and decoding each transmitting source responsive to the determined order from step i) assuming perfect cancellation of signals of preceding or previously decoded transmitting sources; and iv) re-encoding a decoded message of each transmitting source, except a transmitting source decoded last, responsive to a modulation and coding scheme employed by the transmitting source and the corresponding effective channel matrix and subtracting it from the received observations in the equivalent linear form.