Adaptive OFDM system for communications over the indoor wireless optical channel

González, O.; Pérez‐Jiménez, Rafael; Rodriguez, Stephen; Rabadán, José; Ayala, Alejandro

doi:10.1049/ip-opt:20050081

Cited by 55 publications

(44 citation statements)

References 14 publications

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“…In optical transmission with Intensity Modulation/Direct Detection (IM/DD), a DC bias is usually added to the signal to ensure that the signals are all positive [10]. Finally, the OFDM signal is passed through a parallel-to-serial converter (P/S) to generate a discrete-time OFDM symbol s(n) of duration GT NT T s , where N B f / is the frequency spacing between the subcarriers within the bandwidth B, prior to being applied to the optical source.…”

Section: Optical Ofdmmentioning

confidence: 99%

“…In [8] an adaptive decision equalizer is used to combat ISI. OFDM has been used in mainly RF based wireless communication schemes offering high data rates capability as well as high bandwidth efficiency and effectively dealing with the multipath induced ISI [9] and has been proposed in optical wireless communications by researchers [10]. In OFDM a large number of closely-spaced orthogonal subcarriers, each modulated at a low symbol rate, is employed to offer overall data rates similar to conventional single-carrier modulation schemes within the same channel bandwidth [9].…”

Section: Introductionmentioning

confidence: 99%

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Orthogonal frequency division multiplexing for indoor optical wireless communications using visible light LEDs

Hashemi

Ghassemlooy

et al. 2008

2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing

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Section: Optical Ofdmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Orthogonal frequency division multiplexing for indoor optical wireless communications using visible light LEDs

Hashemi

Ghassemlooy

et al. 2008

2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing

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“…OFDM is used extensively in broadband wired and wireless communication systems because it is an effective solution to intersymbol interference (ISI) caused by a dispersive channel. Very recently, a number of papers have described the use of OFDM in a range of optical systems including optical wireless, multimode fiber and single mode fiber [1][2][3]. OFDM is the modified version of frequency division multiplexing in which the transmitted data is divided like small data of packets and then transmitted in parallel.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of RoF PON System based on Orthogonal Frequency Division Multiplexing Technique

Pehraj¹,

Divya²

2014

IJCA

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The requirement of high bandwidth, high flexibility, high mobility and high data rate at lower cost can be met with a real convergence of radio over fiber (RoF) and orthogonal frequency division multiplexing (OFDM) techniques. This paper compares the results of OFDM as a modulation for radio over fiber in passive optical network (PON) for 288km single mode fiber with that of dispersion compensator fiber. The four optical network units (ONUs) are connected by using 1:4 ratio passive optical splitter. A laser source of 1550 nm, bit rate of 10 Gbits/sec is used to simulate the system.

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“…(1) DC-biased optical OFDM (DCO-OFDM)-adding a DC bias to the original signal [6,7,11]; (2) Asymmetrically clipped optical OFDM (ACO-OFDM)-only mapping the data to the odd subcarriers and clipping the negative parts without information loss [8]; (3) Flip-OFDM-transmitting positive and negative parts in two consecutive unipolar symbols [10].…”

Section: Introductionmentioning

confidence: 99%

EVM and achievable data rate analysis of clipped OFDM signals in visible light communication

Baxley

Zhou

2012

J Wireless Com Network

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Orthogonal frequency division multiplexing (OFDM) has been considered for visible light communication (VLC); thanks to its ability to boost data rates as well as its robustness against frequency-selective fading channels. A major disadvantage of OFDM is the large dynamic range of its time-domain waveforms, making OFDM vulnerable to nonlinearity of light emitting diodes. DC-biased optical OFDM (DCO-OFDM) and asymmetrically clipped optical OFDM (ACO-OFDM) are two popular OFDM techniques developed for the VLC. In this article, we will analyze the performance of the DCO-OFDM and ACO-OFDM signals in terms of error vector magnitude (EVM), signal-to-distortion ratio (SDR), and achievable data rates under both average optical power and dynamic optical power constraints. EVM is a commonly used metric to characterize distortions. We will describe an approach to numerically calculate the EVM for DCO-OFDM and ACO-OFDM. We will derive the optimum biasing ratio in the sense of minimizing EVM for DCO-OFDM. In addition, we will formulate the EVM minimization problem as a convex linear optimization problem and obtain an EVM lower bound against which to compare the DCO-OFDM and ACO-OFDM techniques. We will prove that the ACO-OFDM can achieve the lower bound. Average optical power and dynamic optical power are two main constraints in VLC. We will derive the achievable data rates under these two constraints for both additive white Gaussian noise channel and frequency-selective channel. We will compare the performance of DCO-OFDM and ACO-OFDM under different power constraint scenarios.

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Adaptive OFDM system for communications over the indoor wireless optical channel

Cited by 55 publications

References 14 publications

Orthogonal frequency division multiplexing for indoor optical wireless communications using visible light LEDs

Orthogonal frequency division multiplexing for indoor optical wireless communications using visible light LEDs

Performance Analysis of RoF PON System based on Orthogonal Frequency Division Multiplexing Technique

EVM and achievable data rate analysis of clipped OFDM signals in visible light communication

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