Orthogonal chirp-division multiplexing for IM/DD-based short-reach systems

Ouyang, Xing; Talli, Giuseppe; Power, Mark; Townsend, Paul D.

doi:10.1364/oe.27.023620

Cited by 21 publications

(6 citation statements)

References 21 publications

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“…According to the odd symmetry property of Fresnel integration(i.e., c (v) = −c (−v) and s (v) = −s (−v) ), substitute (19) into (17):…”

Section: A Doppler Analysis Of Ocdm In Swacmentioning

confidence: 99%

“…Additionally, OCDM can achieve better performance with a similar peak-to-average power ratio and spectral efficiency compared with OFDM [17]. Up to now, OCDM is widely used in optical fiber communication [18], [19], transferometric power line sensing [20], and underwater acoustic communication [21]. In reference [21], a UAC system based on OCDM is proposed and the system performance on an under-loaded scenario is investigated which shows a promising bit error rate (BER) compared to traditional OFDM.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Doppler and Multipath on Orthogonal Chirp Division Multiplexing in Shallow Water Acoustic Channel

Bai

2022

IEEE Access

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In the scenario of underwater acoustic communication, Orthogonal Frequency Division Multiplexing (OFDM) is widely used for its high spectral efficiency and high transmission rate. However, OFDM is sensitive to Doppler shift, which will generate inter-carrier interference to degrade bit error rate performance. Orthogonal Chirp Division Multiplexing (OCDM) consists of multiplexing a number of chirp waveforms that are mutually orthogonal with each other and share the same bandwidth and time slot, achieving good robustness against multipath and Doppler shift. This study reviews the concepts of Orthogonal Chirp Division Multiplexing and combines this multicarrier communication scheme with an underwater acoustic channel. Unlike previous studies analyzing within the signal domain, this study formulates the mathematical model of OCDM in shallow water acoustic channel and illustrates the reason why OCDM can outperform OFDM in both Doppler robustness and multipath robustness, which is a necessary and solid complement for OCDM in the further development of underwater acoustic communication.

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“…According to the odd symmetry property of Fresnel integration(i.e., c (v) = −c (−v) and s (v) = −s (−v) ), substitute (19) into (17):…”

Section: A Doppler Analysis Of Ocdm In Swacmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Doppler and Multipath on Orthogonal Chirp Division Multiplexing in Shallow Water Acoustic Channel

Bai

2022

IEEE Access

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“…( 8), it can be found that the OCDM signal is complex and cannot be applied to the intensity modulation direct detection (IMDD) transmission system. DUC is performed to convert the complex baseband OCDM signal to passband so that all the spectral content is at the positive frequency while preserving all the information of the baseband signal [18]. Specifically, assuming that the continuous time domain signal after the P/S is () st , then the signal after the up-conversion can be given by: Among them up f is the frequency of the up-conversion carrier.…”

Section: (B)mentioning

confidence: 99%

Transmission of OCDM Based on Asymmetric Pair Mapping Over a Seven Core Fiber

et al. 2022

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In this paper, transmission of orthogonal chirp division multiplexing (OCDM) based on asymmetric pair mapping over a seven core fiber is proposed. High-order 32 quadrature amplitude modulation (QAM) is reduced to quadrature phaseshift keying (QPSK) and 8 QAM signal employing asymmetric pair mapping, which will not affect the rate of the system. Combined with geometric shaping (GS), the average transmission power is successfully lowered, realizing signal damage suppression. In order to verify the performance of the proposed asymmetric pair mapping scheme, a 140 Gb/s asymmetric pair mapping OCDM signal transmission over 2 km seven core fiber is experimentally demonstrated. The experimental results show that the proposed transmission scheme has the best performance when the power distribution ratio (PDR) is 4 dB. Meanwhile, compared with GS 32 QAM with QPSK+rectangle 8 QAM, GS 32 QAM with QPSK+star 8 QAM and GS 32 QAM, the proposed asymmetric pair mapping OCDM signal has improved by 1.55dB, 1.45dB, and 0.7dB, respectively. It has a wide range of applications in the future optical transmission system due to its outstanding performance in the suppression of high-order modulation signal degradation.

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“…Although both waveforms can actually achieve "full diversity" against multipath mobile channels, unlike OCDM, they are not backward compatible with OFDM-like signals as they require dedicated transmitter and receiver structures, which may limit their deployment in practice. Otherwise, it has been shown that OCDM can also be used in optical communications [1], [12], [13] and underwater acoustic communications [14], [15]. Thus, the OCDM is an interesting candidate for a wide range of future communications systems.…”

Section: Papr Reduction Techniques Based On Chirpmentioning

confidence: 99%

PAPR Reduction Techniques Based on Chirp Selection for Single and Multi-User Orthogonal Chirp Division Multiplexing System

Savaux¹

2022

Preprint

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<p>This paper deals with peak to average power (PAPR) reduction in a single and multi-user orthogonal chirp division multiplexing (OCDM) context. Two methods for PAPR reduction based on the selection of the frequency variation (up or down) of the chirps are first presented in a single user system. The first technique consists in considering two OCDM signals generated with up and down chirps, respectively, and selecting the one offering lowest PAPR. The second PAPR reduction method is based on usual clipping, and in that case the chirp selection aims to reduce the clipping noise. An adapted receiver is also presented, based on the maximum likelihood (ML) estimation of the frequency variation (up or down) of the chirp. Then, a general procedure for multi-user OCDM transmission is introduced, where a sub-band of the available bandwidth is dedicated to each user, whose frequency of the chirps varies within this sub-band. Next, the PAPR reduction techniques are generalized to this multi-user OCDM system. Moreover, a performance analysis of the first PAPR reduction method is developed, and supported by simulation results. It is also shown that the chirp selection reduces the clipping noise, and improves the bit error rate performance compared with clipping only.</p>

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Orthogonal chirp-division multiplexing for IM/DD-based short-reach systems

Cited by 21 publications

References 21 publications

Analysis of Doppler and Multipath on Orthogonal Chirp Division Multiplexing in Shallow Water Acoustic Channel

Analysis of Doppler and Multipath on Orthogonal Chirp Division Multiplexing in Shallow Water Acoustic Channel

Transmission of OCDM Based on Asymmetric Pair Mapping Over a Seven Core Fiber

PAPR Reduction Techniques Based on Chirp Selection for Single and Multi-User Orthogonal Chirp Division Multiplexing System

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