Soft-Decision Decoding of Permutation-Based Optical Codes for a Multiple Access System

Shimaponda-Nawa, Mulundumina; Kolade, Oluwafemi; Ding, Wenbo; Jayakody, Dushantha Nalin K.; Cheng, Ling

doi:10.1109/lcomm.2021.3090858

Cited by 3 publications

(6 citation statements)

References 16 publications

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“…A further 439 reduction in the complexity of the system is implemented 440 by the use of an SD decoder. This decoder can be a better 441 alternative to the hard-decision (HD) decoder whose compu-442 tational complexity increases exponentially with an increase 443 in the code length and cardinality, as shown in [55]. It is noted 444 that the implementation of the PC-TDHS scheme reduces the 445 spectral efficiency of the system.…”

Section: ) In Detectionmentioning

confidence: 99%

“…When PCs are used, the low-complexity SD Hungarian-Murty (HM) decoder [55], [57], [58], can be used. In this type of decoder, the Hungarian algorithm solves an assignment problem, where the objective is to assign a number of resources to an equal number of activities [59].…”

Section: ) Permutation Codes and Soft-decision Decodingmentioning

confidence: 99%

“…Thus, when the Hungarian algorithm is applied to a permutation coded communication system, the aim will be to find the optimal solution of the cost of the likely transmitted permutation codeword. The mathematical model of an assignment problem [55], [58], [59], can be expressed as: subject to the constraints M g=1 c gl = M l=1 c gl = 1, (g, l = 519 1, 2, . .…”

Section: ) Permutation Codes and Soft-decision Decodingmentioning

confidence: 99%

“…The codewords in 543 turn determine the specific time-slot to carry the modulated 544 symbols, similar to the PC-TDHS scheme. the SD decoder based on the Hungarian and Murty's algorithms as presented in [55], whose decoding process differs at the receiver, the minimum Hamming distance between 577 codeword of different users and the cyclic properties of the 578 combined permutation codewords, are cardinal.…”

Section: Multiple Access For Pc-tdhs Based Hpv System 534mentioning

confidence: 99%

“…As such, PCs are used to attain a systematic pattern of timeslot activation. We note from literature that PCs can be used in an MA system to identify different users [50], [55], hence the TDHS scheme with PCs is extended to an MA HPV system.…”

mentioning

confidence: 99%

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Impulse Noise Mitigation by Time-Diversity Hermitian Symmetry in Hybrid Powerline and Visible Light Communication Systems

Shimaponda-Nawa

Kolade

et al. 2022

IEEE Access

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Hybrid powerline and visible light communication (HPV) systems offer a cost-effective method of providing high-speed communication in indoor and outdoor environments, for the realisation of internet of things (IoT). However, in the HPV system the powerline communication (PLC) channel is inherently susceptible to impulse noise (IN) due to electrical appliances randomly connected to the powerline. This adversely affects the HPV system's bit error rate (BER) performance. In this paper, a time-diversity Hermitian symmetry (TDHS) scheme, which mitigates the effects of IN in a PLC channel is proposed. The scheme employs the Hermitian symmetry structure to recover information symbols likely to have been affected by the IN. By using the TDHS scheme, the probability of the effect of IN on data symbols through a PLC channel, is drastically reduced by 75%. By simulations, the effectiveness of the TDHS scheme is demonstrated via the enhanced BER performance of the system. The TDHS scheme is then implemented over a permutation coded HPV system using the amplify-and-forward protocol at the PLC-VLC integration unit and the Hungarian-Murty (HM) soft-decision decoder at the destination. The combination of the TDHS scheme and the HM decoder in a coded system provides further BER performance enhancement, exceeding 10 dB gain in signal-to-noise ratio (SNR) at a BER of 10 −4 . INDEX TERMSHermitian symmetry, hybrid powerline and visible light communication, impulse noise, time-diversity. I. INTRODUCTION 17 Smart homes, smart cities, smart mines, wearables and con-18 nected cars are just but a few areas where the internet of 19 things (IoT) has developed and will continue to grow [1], [2], 20 [3]. This growth demands increasingly wide coverage areas, 21 high capacities and data rates to maintain reliable and ubiq-22 uitous connectivity of several smart devices and machines, 23 157 that simultaneously exploiting the advantages of the clip-158 ping and blanking schemes by combining them yields better 159 results, compared to using the two schemes independently. 160 While, in [43], pre-processing the signal at the transmitter 161 was proposed and shown to enhance the performance of 162 the blanking/clipping-based techniques for IN mitigation in 163 powerline channels. In [45], simple iterative impulsive noise 164 suppression algorithms that exploit the noise structure in 165 the time and frequency domain, were shown to improve the 166 performance of the OFDM receiver. Further, in [44], the 167 performance of the PLC system was enhanced by preceding 168 the iterative algorithms discussed in [45] with a clipping and 169 nulling technique. Noting the inherent issue of high peak-170 to-average power ratio (PAPR) of the transmitted signal in 171 OFDM-based systems, various studies have proposed and 172 used some variations of the OFDM techniques in PLC. For 173 example, vector OFDM (VOFDM) has been reported to 174 exhibit lower PAPR than conventional OFDM [46], [47], con-550 only slightly compared to the description in Section III-B1.551The di...

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Section: ) In Detectionmentioning

confidence: 99%

Section: ) Permutation Codes and Soft-decision Decodingmentioning

confidence: 99%

Section: ) Permutation Codes and Soft-decision Decodingmentioning

confidence: 99%

Section: Multiple Access For Pc-tdhs Based Hpv System 534mentioning

confidence: 99%

mentioning

confidence: 99%

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Impulse Noise Mitigation by Time-Diversity Hermitian Symmetry in Hybrid Powerline and Visible Light Communication Systems

Shimaponda-Nawa

Kolade

et al. 2022

IEEE Access

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Generalized Permutation Coded OFDM-MFSK in Hybrid Powerline and Visible Light Communication

2022

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Channel impairments from the powerline communication (PLC) and visible light communication (VLC) technologies, are one of the causes of performance degradation in a hybrid PLC and VLC (HPV) system. In this paper, we focus on one of the inherent noise types in PLC channels, impulse noise (IN), which is characterised by short bursts of rapidly modified amplitudes caused by random switching of electrical devices onto the power network. Recently, a permutation coded orthogonal frequency division multiplexing (OFDM) with M -ary frequency shift keying (M FSK) scheme, in short, PC OFDM-M FSK, was proposed for IN mitigation in PLC systems. It is conceived that the robustness of this scheme against IN in standalone PLC systems will enhance the error performance of the HPV system. Furthermore, since one of the disadvantages of the PC OFDM-M FSK scheme compared to that using only the classical OFDM scheme, is degraded data rate, we propose a generalised PC OFDM-M FSK scheme to improve the degraded data rate. It is shown in this paper that the use of OFDM-M FSK improves the performance of an HPV system compared to that using only the classical OFDM modulation scheme, by a signal-to-noise (SNR) ratio gain of 6 dB at a bit error rate (BER) of 10 −4 . Furthermore, the use of the soft-decision Hungarian-Murty (HM) decoder enhances the error performance, showing an SNR gain of about 3 dB and reduces the decoding complexity of the PC OFDM-M FSK HPV system. Moreover, the generalisation of the PC OFDM-M FSK HPV system, does not increase the decoding complexity when the SD HM decoder is used.INDEX TERMS Frequency shift keying (FSK), generalised permutation coding, orthogonal frequency division multiplexing (OFDM), powerline communication (PLC), visible light communication (VLC).

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A Subcarrier Permutation Scheme for Noise Mitigation and Multi-Access in Powerline Channels

Kolade

Abu‐Mahfouz

Cheng

2021

2021 IEEE International Symposium on Power Line Communications and Its Applications (ISPLC)

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Soft-Decision Decoding of Permutation-Based Optical Codes for a Multiple Access System

Cited by 3 publications

References 16 publications

Impulse Noise Mitigation by Time-Diversity Hermitian Symmetry in Hybrid Powerline and Visible Light Communication Systems

Impulse Noise Mitigation by Time-Diversity Hermitian Symmetry in Hybrid Powerline and Visible Light Communication Systems

Generalized Permutation Coded OFDM-MFSK in Hybrid Powerline and Visible Light Communication

A Subcarrier Permutation Scheme for Noise Mitigation and Multi-Access in Powerline Channels

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