Parallelised relaying protocol with opportunistic priority assignment for enhanced spectral efficiency in cross-relay interference

• Published in: IET communications 2019-04, Vol.13 (7), p.934-938
• Main Authors: Kim, Kwang-Yul, Kim, Junsu, Shin, Yoan
• Format: Article
• Language: English
• Subjects: cognitive radio; conventional parallelised relaying protocol; conventional relaying schemes; conventional relaying system; enhanced spectral efficiency; opportunistic priority assignment; protocols; radio networks; radiofrequency interference; relays; Research Article; simultaneous transmission; strong cross‐relay interference; two‐phase transmission protocol
• ISSN: 1751-8628; 1751-8636
• DOI: 10.1049/iet-com.2018.5043

A conventional relaying system is based on an orthogonal two-phase transmission protocol where time slots for the source (the first phase) and relays (the second phase) are exclusively allocated to avoid interference. For this reason, the conventional relaying schemes suffer from the reduction in spectral efficiency. In order to overcome this drawback, a parallelised relaying protocol with simultaneous transmission has been proposed. However, simultaneous transmission may not be a good strategy in such a strong cross-relay interference. In this study, the authors propose a parallelised relaying protocol with an opportunistic priority assignment. In the proposed scheme, they consider the cognitive radio technique as a way to improve the spectral efficiency of the conventional parallelised relaying protocol in the cross-relay interference. They evaluate the instantaneous capacity of the proposed scheme through computer simulations and conclude that their scheme can improve the spectral efficiency of the conventional relaying systems significantly.