Theoretical Analysis of New PN Code on Optical Wireless Code-Shift-Keying

Takamaru, Yusuke; Rai, Sachin; Habuchi, Hiromasa

doi:10.1587/transfun.e97.a.2572

Cited by 11 publications

(5 citation statements)

References 11 publications

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“…From Eqs. (1), ( 14) and (15), the correlation values Γ 1 and Γ 0 calculated at the kth user's decoder (0…”

Section: Appendix B: Cancellation Of Mui and Background Light Varying By Slot In The Proposed Schemementioning

confidence: 99%

“…Moreover, several schemes have been proposed to increase the data rate of optical CSK communication systems. The pseudo-orthogonal extended prime code set (POEPC) [15] is a combination of GMPSCs and bi-orthogonal codes [16], and the extended pseudo-orthogonal M-sequence (EPOM) [17] is a combination of MPOMs and bi-orthogonal codes. The data rates of POEPC and EPOM are higher than those of the conventional optical CSK employing a single signature code, while POEPC and EPOM pay the cost of doubling the chip rate.…”

Section: Introductionmentioning

confidence: 99%

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Optical CDMA Scheme Using Generalized Modified Prime Sequence Codes and Extended Bi-Orthogonal Codes

Ono¹,

Yamasaki²,

Miyazaki³

et al. 2021

IEICE Trans. Fundamentals

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Optical code-division multiple-access (CDMA) techniques provide multi-user data transmission services in optical wireless and fiber communication systems. Several signature codes, such as modified prime sequence codes (MPSCs), generalized MPSCs (GMPSCs) and modified pseudo-orthogonal M-sequence sets, have been proposed for synchronous optical CDMA systems. In this paper, a new scheme is proposed for synchronous optical CDMA to increase the number of users and, consequently, to increase the total data rate without increasing the chip rate. The proposed scheme employs a GMPSC and an extended bi-orthogonal code which is a unipolar code generated from a bipolar Walsh code. Comprehensive comparisons between the proposed scheme and several conventional schemes are shown. Moreover, bit error rate performance and energy efficiency of the proposed scheme are evaluated comparing with those of the conventional optical CDMA schemes under atmospheric propagation environment.

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“…From Eqs. (1), ( 14) and (15), the correlation values Γ 1 and Γ 0 calculated at the kth user's decoder (0…”

Section: Appendix B: Cancellation Of Mui and Background Light Varying By Slot In The Proposed Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical CDMA Scheme Using Generalized Modified Prime Sequence Codes and Extended Bi-Orthogonal Codes

Ono¹,

Yamasaki²,

Miyazaki³

et al. 2021

IEICE Trans. Fundamentals

View full text Add to dashboard Cite

show abstract

“…For example, when m=4 and n=2, G 2 is written as Since any group of GMPSC has the same characteristics [8], the group of GMPSC can be chosen arbitrarily.…”

Section: System Overviewmentioning

confidence: 99%

“…Thus, the BER of CSK using EPOM is comparable to that of N-CSK using POEPC (N =2) under the same data rate. The channel is assumed to be an indoor optical-wireless channel with background noise and a weak scintillation process [8], [12]. Table 2 shows the numerical conditions used to obtain the BER performances for CSK using EPOM and N-CSK using POEPC.…”

Section: Transmitter and Receivermentioning

confidence: 99%

“…As conventional optical PN codes for CSK, the optical orthogonal code (OOC) [4], the modified prime sequence code (MPSC) [5], and the generalized MPSC (GMPSC) [6] have been proposed. We proposed the pseudo-orthogonal extended prime code set (POEPC) [7], [8] and the extended pseudo-orthogonal M-sequence (EPOM) [9]. Note that POEPC and EPOM are generated by combining two kinds of optical PN codes.…”

Section: Introductionmentioning

confidence: 99%

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Improved Code-Shift Keying Systems with Functional Pseudonoise Code in Optical-Wireless Channel

Takayanagi

Habuchi

Takamaru

et al. 2016

Journal of Signal Processing

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In this paper, improved code-shift keying (CSK) systems with a functional pseudonoise (PN) code are considered for use in indoor optical-wireless channels. In CSK, increasing the number of optical PN codes improves the data rate. It is also effective for increasing the number of simultaneously transmitting optical PN codes. This method is named N-parallel CSK (N-CSK), which indicates the transmission of N codes. In order to enhance the data rate of CSK systems, optical PN code design has become one of the key areas of study. As such functional codes, in this paper we consider EPOM and POEPC, which can be generated by fusing two kinds of optical PN codes. CSK systems can implement two-stage demodulation, which demodulates every optical PN code. It is expected that two-stage demodulation will improve the bit error rate (BER) performance of CSK systems. In this paper, we combine two-stage demodulation with CSK systems: CSK using EPOM and N-CSK using POEPC. It was found that the BER of CSK systems can be improved by utilizing two-stage demodulation.

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Parallel Optical Wireless Communication System with Hierarchical Nonorthogonal Code Shift Keying

Komuro

Habuchi

2021

Lecture Notes in Electrical Engineering

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Theoretical Analysis of New PN Code on Optical Wireless Code-Shift-Keying

Cited by 11 publications

References 11 publications

Optical CDMA Scheme Using Generalized Modified Prime Sequence Codes and Extended Bi-Orthogonal Codes

Optical CDMA Scheme Using Generalized Modified Prime Sequence Codes and Extended Bi-Orthogonal Codes

Improved Code-Shift Keying Systems with Functional Pseudonoise Code in Optical-Wireless Channel

Parallel Optical Wireless Communication System with Hierarchical Nonorthogonal Code Shift Keying

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