On improving the accuracy of Visible Light Positioning system with SLM-based PAPR reduction schemes

Huang, Yanqi; Liu, Yourong; Shi, Lina; Shi, Dayu; Zhang, Xun; Zheng, Jihong

doi:10.1109/bmsb49480.2020.9379574

Cited by 2 publications

(2 citation statements)

References 20 publications

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“…In the signalling and scrambling technique, there are partial transmit sequences (PTS) and selective mapping (SLM), in which a step rotation factor value is adjusted, and a signal with the lowest PAPR is chosen for transmission [25]. However, this is achieved at the expense of many side information bits, reducing spectral efficiency and increased computational complexity overhead [26]. The clipping technique is the most common example of a pre-distorting signal technique, in which a signal amplitude that is larger than a pre-determined value is clipped, resulting in a reduction in PAPR.…”

Section: Introductionmentioning

confidence: 99%

A complexity efficient PAPR reduction scheme for FBMC-based VLC systems

2024

Opto-Electronics Review

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Visible light communication based on a filter bank multicarrier holds enormous promise for optical wireless communication systems, due to its high-speed and unlicensed spectrum. Moreover, visible light communication techniques greatly impact communication links for small satellites like cube satellites, and pico/nano satellites, in addition to inter-satellite communications between different satellite types in different orbits. However, the transmitted visible signal via the filter bank multicarrier has a high amount of peak-toaverage power ratio, which results in severe distortion for a light emitting diode output. In this work, a scheme for enhancing the peak-to-average power ratio reduction amount is proposed. First, an algorithm based on generating two candidates signals with different peakto-average power ratio is suggested. The signal with the lowest ratio is selected and transmitted. Second, an alternate direct current-biased approach, which is referred to as the addition reversed method, is put forth to transform transmitted signal bipolar values into actual unipolar ones. The performance is assessed through a cumulative distribution function of peak-to-average power ratio, bit error rate, power spectral density, and computational complexity. The simulation results show that, compared to other schemes in literature, the proposed scheme attains a great peak-to-average power ratio reduction and improves the bit the error rate performance with minimum complexity overhead. The proposed approach achieved about 5 dB reduction amount compared to companding technique, 5.5 dB compared to discrete cosine transform precoding, and 8 dB compared to conventional direct current bias of an optical filter bank multicarrier. Thus, the proposed scheme reduces the complexity overhead by 15.7% and 55.55% over discrete cosine transform and companding techniques, respectively.

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Section: Introductionmentioning

confidence: 99%

A complexity efficient PAPR reduction scheme for FBMC-based VLC systems

2024

Opto-Electronics Review

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“…According to the central limit theorem, OFDM signals tend to be Gaussian distributed in time domain when at least 64 subcarriers are used, resulting in a high peak-to-average-power-ratio (PAPR). There are various methods to reduce the PAPR, such as selective mapping (SLM) [5] or pilot-assisted techniques [6]. However, these typically reduce the data rate of the system.…”

Section: Introductionmentioning

confidence: 99%

Spectral Properties of Clipping Noise

2021

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One serious disadvantage of any multicarrier-modulation technique such as orthogonal frequency division multiplexing (OFDM) is its high peak-to-average-power ratio (PAPR) which might lead to signal clipping in several scenarios. To maximize the transmit data rate, it is important to take this non-linear distortion into account. The most common approach is based on the Bussgang theorem, which splits the distortion in a correlated part, represented by a linear damping factor, and uncorrelated additive noise. However, there are two aspects that are not correctly considered by the Bussgang theorem. Firstly, clipping noise shows a frequency-dependent power spectrum which depends on the clipping probability. Secondly, some of the clipping noise power is located outside of the transmission bandwidth, so that it does not influence the transmission quality. In this work, the Bussgang theorem is reviewed in detail and the exact power spectral density of the uncorrelated clipping noise is approximated to determine the signal-to-noise power ratio on every subcarrier separately. Although it is shown that the frequency dependence within the transmission bandwidth is relatively small, at least 36% of the uncorrelated noise power, depending on the clipping level, lays outside of the transmission band. Monte Carlo simulations validate that a simple expression for the power spectral density allows to calculate the symbol error probability of an OFDM transmission system that suffers from clipping. Furthermore, the newly found result can be used to optimize bit allocation tables in bit loading algorithms or to calculate the channel capacity.

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On improving the accuracy of Visible Light Positioning system with SLM-based PAPR reduction schemes

Cited by 2 publications

References 20 publications

A complexity efficient PAPR reduction scheme for FBMC-based VLC systems

A complexity efficient PAPR reduction scheme for FBMC-based VLC systems

Spectral Properties of Clipping Noise

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