| CPC H04B 7/0456 (2013.01) [H04L 25/0204 (2013.01); H04L 25/0256 (2013.01)] | 20 Claims |
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1. A method for generating a codebook, the method performed by at least one processor, the method comprising:
identifying auto-correlation function (ACF) information by:
obtaining channel information that includes multiple channels of expected operation scenarios; and
based on the channel information for each of the channels, determining minimum mean-square error (MMSE) channel estimation (CE) weights expressed in a form of auto-correlation functions (ACFs) and a signal-to-noise ratio (SNR), and covariance matrices;
clustering the MMSE CE weights from the ACF information into K clusters, wherein a center ACF weight of each of the K clusters represents a codeword for computing channel estimation weights;
determining a classification distance metric based on a cluster distance after a re-clustering;
in response to a determination that cluster distances before and after the clustering differ from each other by a non-negligible value, iteratively re-clustering the ACF information thereby updating the center ACF weights and the cluster distances; and
generating the codebook to include an index k of each of the K clusters and the center ACF weight of each of the K clusters.
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