×

Nonlinear precoding method for a digital broadcast channel

  • US 8,130,854 B2
  • Filed: 07/07/2004
  • Issued: 03/06/2012
  • Est. Priority Date: 07/17/2003
  • Status: Active Grant
First Claim
Patent Images

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 ak with k from 1 to K from a signal constellation having Mk·

  • levels and a signal point spacing Ak·

    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 vk from the range of values ak+Ak·

    Mk·

    zkk, where zkk is from the set of positive or negative integers including zero, and linear preequalization of the selected representatives vk to form transmit signals xk to be transmitted, comprising;

    applying the nonlinear precoding method only to a reduced channel matrix Hred that is calculated from the equation H=Hred R, whereby H is the known channel matrix and R is a residual interference matrix indicating remaining interferences at the receive-side, the residual interference matrix containing interference elements chosen to assume a range of values Ak·

    Mk zki, where zik is from the set of positive or negative integers including zero.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×