Paper Info
Title
Equalized Time Reversal Beamforming for Frequency-Selective Indoor MISO Channels.
Abstract
Time-reversal (TR) is a beamforming technique for wireless frequency-selective channels, which has received increasing attention due to its high energy efficiency and low computational complexity. In this paper, we present two contributions on TR beamforming for single-user indoor wideband MISO systems. First, we provide novel analyses of a baseband TR system using two commonly used indoor propagation channel models. We derive closed-form approximations for the inter-symbol interference (ISI) with these channel models in order to characterize the influence of propagation conditions (such as the power-delay profile, delay spread, and bandwidth) on TR performance metrics. In particular, we analyze spatial focusing and time compression performance of TR beamforming, and their impact on the bit error rate (BER). As a second contribution, we introduce an equalized TR (ETR) technique that mitigates the ISI of conventional TR. The proposed ETR utilizes a zero-forcing pre-equalizer at the transmitter in a cascade configuration with the TR pre-filter. Unlike previous approaches to ISI mitigation in TR systems, we derive theoretical performance bounds for ETR and show that it greatly enhances the BER performance of conventional TR with minimal impact to its beamforming capabilities. By means of numerical simulations, we verify our closed-form approximations and show that the proposed ETR technique outperforms conventional TR with respect to the BER under any SNR.
Year
DOI
Venue
2017
10.1109/ACCESS.2017.2682160
IEEE ACCESS
Keywords
Field
DocType
Time-reversal beamforming,space-time focusing,MISO systems,equalization,frequency-selective channels
Transmitter,Beamforming,Wideband,Baseband,Computer science,Delay spread,Algorithm,Communication channel,Real-time computing,Bandwidth (signal processing),Bit error rate,Distributed computing
Journal
Volume
ISSN
Citations 
5
2169-3536
2
PageRank 
References 
Authors
0.37
16
2
Name
Order
Citations
PageRank
Carlos Andrés Viteri-Mera171.81
Fernando L. Teixeira29716.97