Paper Info
Title
Experimental Studies on a Decision-Feedback Channel Tracking Scheme Implemented in FPGA for MIMO-OFDM Systems
Abstract
This paper describes the experimental evaluation of a testbed with a simple decision-feedback channel tracking scheme for MIMO-OFDM systems. The channel tracking scheme periodically estimates the channel state matrix for each subcarrier from received signals and replicas of the transmitted signal. The estimated channel state matrices, which are obtained at mutually different timings, are combined based on maximum ratio combining and used for MIMO signal detection. The testbed was implemented on field programmable gate arrays (FPGAs) of 1/5 scale, which confirms the implementation feasibility of the channel tracking scheme. The packet error rate (PER) and mobility performance of the testbed were measured. The testbed employed a 2 × 2 MIMO channel, zero-forcing algorithm for MIMO signal detection, 16QAM for the subcarrier modulation scheme, and coding rate of 1/2. The proposed scheme suppressed the increase in the required SNR for PER of 10-2 to less than 1 dB when the relative velocity between the transmitter and the receiver was less than 45 km/h assuming 5 GHz band operation. In addition, the proposed scheme offers 6.3% better throughput than the conventional scheme. The experimental results demonstrate that the channel tracking scheme implemented in the testbed effectively tracks the fluctuation of a MIMO channel.
Year
DOI
Venue
2007
10.1093/ietfec/e90-a.11.2423
IEICE Transactions
Keywords
Field
DocType
subcarrier modulation scheme,conventional scheme,channel tracking scheme,proposed scheme offer,mimo signal detection,mimo-ofdm systems,experimental studies,proposed scheme,simple decision-feedback channel tracking,channel state matrix,decision-feedback channel tracking scheme,estimated channel state matrix,mimo channel,doppler shift,ofdm,mimo
MIMO-OFDM,Subcarrier,Quadrature amplitude modulation,Communication channel,MIMO,Theoretical computer science,Real-time computing,Electronic engineering,Mathematics,Precoding,Orthogonal frequency-division multiplexing,Bit error rate
Journal
Volume
Issue
ISSN
E90-A
11
0916-8508
Citations 
PageRank 
References 
0
0.34
2
Authors
3
Name
Order
Citations
PageRank
Yusuke Asai15415.85
Wenjie Jiang225626.60
Takeshi Onizawa33911.20