Relay selection for DF-based cooperative vehicular systems

Creative Commons License

Akin A. I., İLHAN H., Ozdemir O.

EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1186/s13638-015-0251-3
  • Dergi Adı: EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: Cooperative communication, Decode and forward, Relay selection, Maximal ratio combining, Virtual noise, Maximum likelihood, Log-likelihood ratio, Cooperative maximal ratio combining, Cascaded Nakagami-m fading, USER COOPERATION, PERFORMANCE ANALYSIS, DIVERSITY ORDER, NAKAGAMI, NETWORKS, DEMODULATION, MODEL
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

In this paper, error performance analysis of decode-and-forward (DF)-based cooperative vehicular networks with relay selection is investigated. All of the links in the system are modeled as cascaded Nakagami-m distributed random variables which provide a realistic description of an intervehicular channel. We employ virtual-noise (VN)-based demodulation, maximum likelihood (ML) demodulation, cooperative maximal ratio combining (C-MRC), and log-likelihood-ratio-based transmissions in mitigating error propagation effect encountered in DF cooperative networks. In order to obtain more effective solutions and improve the system performance, we introduce hybrid anti-error propagation approaches, namely VN-MRC, VN-ML, and VN-LLR in which relay selection criterion is derived by using conditional bit error rate (BER) expressions of VN technique while data detection is performed by utilizing maximal ratio combining (MRC), ML detection, C-MRC and LLR transmission methods. The performance analyses and the numerical results for cascaded Nakagami-m channels have shown that VN-LLR approach provides significant performance improvement with respect to the other considered techniques in DF cooperative vehicular systems with relay selection.