Paper Info
Title
Direct Wireless Link to Out-of-Range Node With Assistance of Surrounding Nodes
Abstract
We propose a method that establishes a direct wireless link from a transmission source to an out-of-range destination with the assistance of the surrounding communication nodes. In this method, a weak (subthreshold) signal is amplified by utilizing the interference signals transmitted from the surrounding communication nodes. To evaluate the amplification gain, we study the mutual information in a multipath fading channel. As a result, we reveal that the mutual information is enhanced owing to the interference signals, and the proposed method enlarges the radio coverage area of the source node. To understand the enhancement mechanism, we introduce a toy model of the propagation channel and discuss the role of the interference signals. We find that the interference signals allow the subthreshold signals into the detectable region in the signal space. Moreover, the mutual information is maximized at the optimal power of the interference signals. In addition, a detailed discussion of the channel capacity shows that there exists an optimal <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">a priori</italic> probability of symbol transmission.
Year
DOI
Venue
2019
10.1109/TVT.2019.2934502
IEEE Transactions on Vehicular Technology
Keywords
Field
DocType
Interference,Phase shift keying,Mutual information,Fading channels,Channel capacity,Wireless communication
Multipath propagation,Wireless,Computer science,Communication channel,Electronic engineering,Interference (wave propagation),Subthreshold conduction,Mutual information,Channel capacity,Phase-shift keying
Journal
Volume
Issue
ISSN
68
11
0018-9545
Citations 
PageRank 
References 
0
0.34
0
Authors
5
Name
Order
Citations
PageRank
Hiroya Tanaka15118.12
Shintaro Hiraoka200.68
Shintaro Arai39514.09
takaya yamazato423945.32
Yukihiro Tadokoro5148.14