Paper Info
Title
Combining calibration schemes on a real-time multiuser MIMO-OFDM system with implicit feedback
Abstract
Multiple-input multiple-output (MIMO) systems with implicit feedback utilize uplink channel state information (CSI) for downlink transmit beamforming, relying on over-the-air channel reciprocity. We develop real-time hardware for multiuser MIMO transmission with implicit feedback based on orthogonal frequency division multiplexing (OFDM), with field programmable gate arrays (FPGAs). This paper presents indoor experimental results by the real-time hardware, employing several calibration schemes for uplink CSI. In particular, we investigate performance of our proposed scheme, weighted-combining calibration (WCC), in which multiple calibration coefficients are calculated and then combined with weights based on channel gain, to improve the calibration accuracy. It is shown that WCC improves real-time throughput considerably, compared with equal gain-combining calibration (EGCC), a scheme which combines coefficients with equal weighting.
Year
DOI
Venue
2014
10.1109/PIMRC.2014.7136123
2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication (PIMRC)
Keywords
DocType
ISSN
calibration schemes,real-time multiuser MIMO-OFDM system,implicit feedback,multiple-input multiple-output systems,uplink channel state information,downlink transmit beamforming,over-the-air channel reciprocity,orthogonal frequency division multiplexing,field programmable gate arrays,FPGA,uplink CSI,weighted-combining calibration,WCC
Conference
2166-9570
Citations 
PageRank 
References 
0
0.34
8
Authors
6
Name
Order
Citations
PageRank
Hayato Fukuzono161.84
Tomoki Murakami2167.19
Riichi Kudo38115.69
Shoko Shinohara400.68
Yasushi Takatori59224.89
Masato Mizoguchi68014.45