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The impacts of absorption, scattering and the misalignment caused by spatial spreading in the sea, which are modeled by the beam spread function (BSF), as well as the oceanic turbulence on the underwater optical links are all included to describe the practical channel characteristics. In this work, a cooperative optical Internet of Underwater Things (IoUT) system with hybrid decode-amplify-forward (HDAF) strategy is first proposed and investigated over the aggregated underwater wireless optical communication (UWOC) channel. Signal-to-Noise Ratio (SNR) curves, amount of SNR increase to increase transmission rate and/or decrease error/outage probability, etc. Further, our study sheds light on different channel parameters and their usefulness in TRT analysis, such as, error/outage probability vs. This work also investigates the relation between DMT and TRT of MIMO in broad class of fading distributions.

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The analysis is carried out by characterizing the joint pdf of the eigenvalues of Gram matrix in high SNR regime. This paper proposes TRT analysis of MIMO channels under broad class of fading distributions that includes, different identical fading distributions, correlation between channels, non-identical fading distributions, and non-zero channel means. However, Throughput-Reliability Tradeoff (TRT) has the notable advantage of revealing the interplay among transmission rate, signal-to-noise ratio and outage/error probability parameters. The Diversity-Multiplexing Tradeoff (DMT) had been proven to be a powerful evaluation and comparison tool for the existing and new technologies. MIMO wireless communication systems have extensively been employed due to their ability to transfer data efficiently even at higher data rates and are often being used to increase either the multiplexing gain and/or the diversity gain with a tradeoff. Finally, Monte Carlo simulations are performed to validate the theoretical results. Moreover, marginal performance improvement in outage probability is observed at the low signal-to-noise ratio (SNR) regime of the SR-RD correlated channel scenario compared to the uncorrelated channel scenario. In addition, SEP performance degradation is observed in the case of other correlated channel scenarios compared to uncorrelated channel scenario.

In a nutshell, the numerical results reveal that the SRRD correlated channel scenario outperforms the uncorrelated channel scenario in terms of SEP.

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Further, we provide the asymptotic expressions for SEP and outage probability by removing the infinite series terms to investigate the diversity order. In addition, we perform the exact outage probability analysis for the same scenario. In this paper, we derive the exact end-to-end symbol error probability (SEP) for M-ary phase-shift keying (MPSK) signaling using paired error approach and differential binary phase-shift keying (DBPSK) signaling over correlated, non-identical, slow, and flat Nakagami-m fading channels by assuming the correlation between SD-RD, SR-SD, and SR-RD fading channels. We consider a cooperative diversity system with a source (S), a decode and forward (DF) relay (R), and a selection combining (SC) enabled destination (D). Cooperative diversity system improves the communication reliability and throughput in a multipath fading environment with the help of relay nodes.

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