Low-Complexity Precoding Technique for Eight Transmit Antenna MIMO system
Date Issued
2012
Date
2012
Author(s)
Wu, Chih-Lun
Abstract
Spatial Multiplexing for MIMO system uses antenna arrays provide communication link with substantial capacity. Unfortunately, spatial multiplexing is sensitive to multi-antenna
Interference. Precoding can improve the resilience of spatial multiplexing at the expense of full channel knowledge at the transmitter—which is often not realistic. Use quantized precoding system where the optimal precoder is chosen from a finite codebook known to both receiver and transmitter. Receiver calculate preferred codeword as precoding matrix in the codebook，and feedback index of codeword to transmiter.
In order to minimize computational complexity of search precoding matrix. Assume RI evaluation perfect, PMI evaluating based on mutual information. Mutual information is proportional to its subspace distance. We group codewords based on the subspace distance, then minimize complexity of searching precoding matrix using the grouped codebook. Finally we use characteristics of 8Tx codebook and minimize number of codeword selection.
Subjects
LTE
spatial multiplexing
Multi-antenna interference
precoding
8Tx codebook
low complexity
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
index.html
Size
23.27 KB
Format
HTML
Checksum
(MD5):75d4db1eae0b7af91473455d8a2a52da