An asynchronous two-way relay system with full delay diversity in time-varying multipath environments
Author
Salim, A.
Duman, Tolga M.
Date
2015-02Source Title
2015 International Conference on Computing, Networking and Communications, ICNC 2015
Publisher
IEEE
Pages
900 - 904
Language
English
Type
Conference PaperItem Usage Stats
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102
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Abstract
We consider design of asynchronous OFDM-based diamond two-way-relay (DTWR) systems in time-varying frequency-selective (doubly-selective) fading channels such as underwater acoustic (UWA) channels. In a DTWR channel, two users exchange their messages with the help of two relays. Most of the existing work on asynchronous DTWR systems assume only small relative propagation delays between the received signals at each node. However, in practical systems, significant delays may take place. Our proposed system is able to tolerate the delay even if it exceeds the length of the OFDM block which is almost inevitable in UWA channels. We provide analytical and numerical results to verify the advantages of the proposed scheme in mitigating large delays in different fading conditions.
Keywords
Fading channelsOrthogonal frequency division multiplexing
Underwater acoustics
Asynchronous OFDM
Fading conditions
Multi-path environments
Numerical results
Practical systems
Propagation delays
Time-varying frequency
Two-way relay systems
Frequency selective fading