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A Fast Index Search Algorithm for Codebook-based Equal Gain Transmission Beamforming System  

Park, Noe-Yoon (Division of Information & Communication Engineering, Chungbuk National Univ.)
Kim, Young-Ju (Division of Information & Communication Engineering, Chungbuk National Univ.)
Li, Xun (Division of Information & Communication Engineering, Chungbuk National Univ.)
Lee, Kwan-Seob (Division of Information & Communication Engineering, Chungbuk National Univ.)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.45, no.12, 2008 , pp. 83-89 More about this Journal
Abstract
Simple but effective fast codebook searching algorithms for quantized EGT(equal gain transmission) are presented. Using newly defined metric, rough searching selects a few candidate weight vectors. Using the conventional metric, accurate searching determines the optimal vector among the candidates. This strategy reduces the entire searching time. When the number of transmit antenna is two or three, the searching time reduces more than a half less than the conventional searching time. Moreover, the more the size of codebook increases, the more the searching time reduction also increases.
Keywords
Closed-loop MIMO; Beamforming; Codebook; EGT; Index searching;
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