Coded GFDM with decision feedback equaliser for enhanced performance in underwater wireless optical communication

被引:2
作者
Hema, R. [1 ]
Ananthi, A. [1 ]
Diana, D. C. [1 ]
机构
[1] Easwari Engn Coll, Dept Elect & Commun Engn, 162 Bharathi Salai, Chennai 600089, Tamil Nadu, India
关键词
Generalised frequency division multiplexing (GFDM); turbulence; pointing error; forward error correction (FEC); decision feedback equaliser (DFE); SYSTEMS; PROBABILITY; MODULATION; SCHEMES;
D O I
10.24425/opelre.2024.148697
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Underwater wireless optical communication is the best alternative for many applications especially for high bandwidth data communication between underwater objects and vehicles. The implementation of coding scheme along with advanced modulation technique and equalisation methods is identified as a key research scope for enhancing the performance of the system. In this paper, the coded generalised frequency division multiplexing (GFDM) technology is employed to provide high -data rates and less out-of-band emission. The BoseChaudhuri-Hocquenghem (BCH) and Reed-Solomon (RS) coding schemes along with equalisation techniques namely normalised least mean square (NLMS)-based decision feedback equalisers (DFE), minimum mean square error (MMSE) and zero forcing (ZF) are utilized to reduce inter symbol interference (ISI). The bit error rate (BER) performance is evaluated in the presence of pointing error (PE) and turbulence using Monte Carlo channel modelling simulations. The results showed that RS coding with NLMS-DFE outperforms other techniques and achieves a BER of roughly 10 -5 with a signal-to-noise ratio levels below 20 dB. The simulation results demonstrate that RS code with 15 total symbols per code word and 3 data symbols, i.e., RS (15, 3) and BCH code with 31 total symbols in a code word and 6 data symbols, i.e., BCH (31, 6) provided the best error performance among other coding schemes employed. It is inferred that RS (15, 3) coded 2 x 2 multiple input multiple output systems with NLMS-DFE achieved a BER value of 1.1925 x 10 -5 at 11 dB which is 16 dB less than uncoded system. Thus, the coded GFDM improves overall BER performance and has the potential to provide higher reliability for internet of underwater things (IoUT) applications.
引用
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页数:14
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