Patent ID: 8130854
Filing Date: 2012-03-06
Classification: H04L

Abstract:
1. A nonlinear precoding method based on modulo arithmetic for the transmit-side preequalization of K user signals to be transmitted in a digital broadcast channel with known transmission channel matrix H set up between a central transmitting station and K decentralized, non-interconnected receiving stations, the user signals consisting of data symbols a k with k from 1 to K from a signal constellation having M k · levels and a signal point spacing A k · with a periodic multiple representation of the undisturbedly-transmitted data symbols ak in data symbol intervals congruent for K receive-side modulo-decision devices, a transmit-power-minimizing selection of representatives v k from the range of values a k +A k ·M k ·z kk , where z kk is from the set of positive or negative integers including zero, and linear preequalization of the selected representatives v k to form transmit signals x k to be transmitted, comprising: applying the nonlinear precoding method only to a reduced channel matrix H