Open AccessPrecoder Distribution and Adaptive Codebook in Wideband Precoding
Author(s) -
Long Hang,
Kim Kyeong Jin,
Xiang Wei,
Wang Jing,
Liu Yuanan,
Wang Wenbo
Publication year - 2012
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.12.0112.0072
Subject(s) - codebook , precoding , linde–buzo–gray algorithm , quantization (signal processing) , algorithm , wideband , mathematics , computer science , electronic engineering , mimo , telecommunications , engineering , channel (broadcasting)
Based on wideband precoding (WBP) in the multiple‐input multiple‐output orthogonal frequency division multiplexing system, an adaptive nonuniform codebook is presented in this paper. The relationship between the precoder distribution and spatial correlation is analyzed at first. A closed‐form expression based on overlapped isosceles triangles is proposed as an approximation of the precoder distribution. Then, the adaptive codebook design is derived with the approximate distribution to minimize quantization errors. The capacity and bit error rate performance demonstrate that the adaptive codebook with WBP outperforms the conventional fixed uniform codebook.