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    On Performance of Hexagonal, Cross, and Rectangular QAM for Multi-Relay Systems

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    Type
    Article
    Authors
    Singya, Praveen K.
    Kumar, Nagendra
    Bhatia, Vimal
    Alouini, Mohamed-Slim cc
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering
    Electrical Engineering Program
    Date
    2019
    Permanent link to this record
    http://hdl.handle.net/10754/655901
    
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    Abstract
    Error performance is considered as one of the most important performance measures, and deriving the closed-form expressions for efficient modulation techniques over generalized fading channels is important for future cellular systems. In this paper, the performance of a dual-hop amplify-and-forward multi-relay system with best relay selection is analyzed over independent and non-identically distributed (i.n.i.d.) Nakagami-m fading links with both integer and non-integer fading parameters. The impact of practical constraints of imperfect channel state information (CSI) and non-linear power amplifier (NLPA) at each of the relays are considered. Closed-form expressions for the outage probability are derived for both integer and non-integer fading parameters, and asymptotic analysis on the outage probability is performed to obtain the diversity order of the considered multi-relay system. Based on the cumulative distribution function approach, average symbol error rate (ASER) expressions for general order hexagonal QAM, general order rectangular QAM, and 32-cross QAM schemes are also derived. The comparative analysis of ASER for various QAM schemes with different constellations is also illustrated. Furthermore, the impact of the number of relays, fading parameter, channel estimation error, and non-linear distortion on the system performance is also highlighted. Finally, the derived analytical results are validated through Monte-Carlo simulations.
    Citation
    Singya, P. K., Kumar, N., Bhatia, V., & Alouini, M.-S. (2019). On Performance of Hexagonal, Cross, and Rectangular QAM for Multi-Relay Systems. IEEE Access, 7, 60602–60616. doi:10.1109/access.2019.2915375
    Sponsors
    This work is partially supported by the Ministry of Electronics and Information Technology Research and Development Work, Government of India, through the Visvesvaraya Ph.D. Scheme being implemented by Digital India Corporation.
    Publisher
    Institute of Electrical and Electronics Engineers (IEEE)
    Journal
    IEEE Access
    DOI
    10.1109/ACCESS.2019.2915375
    Additional Links
    https://ieeexplore.ieee.org/document/8707956/
    https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8707956
    ae974a485f413a2113503eed53cd6c53
    10.1109/ACCESS.2019.2915375
    Scopus Count
    Collections
    Articles; Electrical Engineering Program; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

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