Spatially Modulated Bidirectional Cognitive Cross Network Design With Physical-Layer Coding

In this paper, a bidirectional cognitive cross network using spatial modulation (SM) along with physical-layer network coding (PLNC) is proposed. In our model, a primary user pair located far from each other, exchanges information in the lack of a direct link so that a relay is required for a reliab...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2018-07, Vol.67 (7), p.6185-6192
Main Authors: Ustunbas, Seda, Aygolu, Umit, Basar, Ertugrul
Format: Article
Language:English
Subjects:
Codes
Coding
Cognitive radio
Computer simulation
Eavesdropping
Interference
Modulation
Network design
physical-layer network coding
Power management
Receiving antennas
Relay
Relays
Resource management
spatial modulation
Transmitting antennas
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Summary:In this paper, a bidirectional cognitive cross network using spatial modulation (SM) along with physical-layer network coding (PLNC) is proposed. In our model, a primary user pair located far from each other, exchanges information in the lack of a direct link so that a relay is required for a reliable communication. A secondary user pair shares their relay with the primary user in return for access to the licensed spectrum. Both users exploit SM while the relay also applies PLNC. It is assumed that each user pair can eavesdrop the signal of the other user pair to use these signals as side information and cancel them from the PLNC mapped signal broadcasted by the relay. Optimum power allocation, in which two scenarios are considered, is proposed for sources and the relay. In Scenario 1, the optimization is performed by minimizing the bit error probability (BEP) of the primary user due to its priority in the licensed band. Scenario 2, which minimizes BEP of both users, provides the optimum results for the whole system. A theoretical BEP analysis is performed and the results are supported via computer simulation results, which are in perfect match with theoretical findings.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2018.2815818