Abstract
The teachings herein present a method and apparatus that implement and use a factorized precoder structure that is advantageous in terms of performance and efficiency. In particular the teachings presented herein disclose an underlying precoder structure that allows for full PA utilization. According to this structure an overall precoder is constructed from a conversion precoder and a tuning precoder. The conversion precoder comprises a block diagonal matrix and has 2?k/2? columns where k is a non-negative integer. Each tuning precoder has the following properties: all non-zero elements are constant modulus; every column has exactly two non-zero elements; and every row has exactly two non-zero elements; two columns either have non-zero elements in the same two rows or do not have any non-zero elements in the same rows; and two columns having non-zero elements in the same two rows are orthogonal to each other. If row m in a tuning precoder column has a non-zero element so does row m+?k/2?.
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