Optimal and suboptimal decoding for SIM-BPSK over Gamma-Gamma FSO links with an erroneous relay

Author

Bansal, Ankur ; Sharma, Prabhat K. ; Bhatnagar, Manav R.

Author_Institution

Div. of ECE, NSIT, New Delhi, India

fYear

2015

fDate

Feb. 27 2015-March 1 2015

Firstpage

1

Lastpage

6

Abstract

In this paper, we analyze a free space optical (FSO) cooperative communication system utilizing the Gamma-Gamma fading optical links and a single decode-and-forward (DF) erroneous relay. We adopt the subcarrier intensity modulation (SIM) technique for transmission of the binary phase shift keying (BPSK) modulated data over an optical link. For the considered DF-FSO cooperative system, we derive a maximum-likelihood (ML) decoder and a sub-optimal piecewise linear (PL) decoder in the destination of the system. The proposed PL decoder performs very close to the ML decoder with a significant reduction in the decoding complexity. Both the ML and the PL decoders incorporate the possibility of erroneous transmission by the DF relay and require the average statistics of the source-relay link for decoding the data of the source in the destination. Moreover, we also derive the closed-form expression for the average bit error rate (BER) of the proposed PL decoder.

Keywords

cooperative communication; decode and forward communication; error statistics; intensity modulation; maximum likelihood decoding; optical communication; optical modulation; phase shift keying; relay networks (telecommunication); BER; DF-FSO cooperative system; FSO cooperative communication system; Gamma-Gamma FSO links; PL decoder; SIM technique; SIM-BPSK; binary phase shift keying; bit error rate; decoding complexity; free space optical cooperative communication system; maximum-likelihood decoder; single decode-and-forward erroneous relay; source-relay link average statistics; sub-optimal piecewise linear decoder; subcarrier intensity modulation technique; suboptimal decoding; Binary phase shift keying; Bit error rate; Cooperative communication; Cooperative systems; Maximum likelihood decoding; Relays;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications (NCC), 2015 Twenty First National Conference on

Conference_Location

Mumbai

Type

conf

DOI

10.1109/NCC.2015.7084903

Filename

7084903