Patent ID: 8774136
Filing Date: 2014-07-08
Classification: H04B,H04L

Abstract:
1. A method implemented by a user equipment in a coordinated multi-point transmission radio communication system, including a first radio network node and a second radio network node, the coordinated multi-point transmission radio communication system comprising a dominant path between said user equipment and said first radio network node and at least one first non-dominant path between said user equipment and the second radio network node, the method comprising: estimating a dominant path channel response based on a first set of channel estimation symbols received from the first radio network node; estimating a first non-dominant path channel response based on a second set of channel estimation symbols received from the second radio network node; determining a ratio of said first non-dominant path channel response to the dominant path channel response; combining real and imaginary parts of said determined ratio into a vector; and quantizing the vector by means of a codebook comprising a plurality of reproduction coefficients generated by executing an iterative algorithm while applying a distortion measure of d(x,{circumflex over (x)})=log(1+∥x−{circumflex over (x)}∥