Journal
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Volume 70, Issue 7, Pages 6343-6354Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2021.3083066
Keywords
4-ary imbalanced-phase-amplitude modulation; coherent detection; optimal constellation; power line communication (PLC); quadrature phase-shift keying (QPSK); receive diversity; symbol error probability (SEP)
Categories
Funding
- Science and Engineering Research Board (SERB), Government of India, through its Start-up Research Grant (SRG) [SRG/2019/001234]
- Science and Engineering Research Board, a Statutory Body of the Department of Science and Technology, Government of India
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This study examines a receive diversity power line communication system affected by correlated multipath channel fading and additive Nakagami-m background noise. It introduces an optimal receiver utilizing 4-ary imbalanced-phase-amplitude modulation for data transmission, as well as numerically computes the optimal constellation and investigates its optimality in relation to noise parameters and multipath channel gains.
A receive diversity power line communication (PLC) system subject to correlated multipath channel fading and corrupted by additive Nakagami-m background noise is considered. The optimal receiver employing a 4-ary imbalanced-phase-amplitude modulation (I-PAM) scheme for data transmission is obtained, using which closed form expressions for the symbol error probability (SEP) in the union bound sense and the SEP in the asymptotic sense at high signal-to-noise ratio (SNR) are derived. The diversity order of the system is found to be independent of the shape parameter of the additive noise. Furthermore, the optimal 4-ary I-PAM constellation minimizing the SEP at lower SNR values is computed numerically. The optimal 4-ary I-PAM constellation is found to be elliptical in shape as opposed to the traditional circular QPSK constellation generally employed in wireless communication systems. The effects of the correlation among the multipath channel gains and the shape parameter of the noise on the optimality of the considered constellation are also presented via numerical studies.
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