Nonlinear effects in optical-wireless OFDM signal transmission

Berceli,; Csornyei,; Klein,; Banky,

doi:10.1109/mwp.2002.1158904

Cited by 6 publications

(6 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…SpeciÞcally for RoF implementations, the effects of the nonlinearity of a Mach-Zehnder external modulator [15], [16] and that of a directly modulated laser diode using a simple polynomial model and making use of the output autocorrelation function [17] have been investigated, while in [18], a comparison between a clipping function and such an RoF link with a laser diode at low bias was carried out.…”

Section: Introductionmentioning

confidence: 99%

Statistical Distribution of EVM Measurements for Direct-Modulation Radio-Over-Fiber Links Transporting OFDM Signals

Assimakopoulos

Nkansah

Gomes

et al. 2013

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

The effect of distortion on the error vector magnitude (EVM) performance of orthogonal frequency-division multiplexing (OFDM) signals with different numbers of subcarriers and the connection to the peak-to-average power ratio (PAPR) of such signals is investigated. A low-cost and low-complexity directly modulated radio-over-Þb e rl i n ki su s e di ne x p e r i m e n t sa sa ne xample of a link limited by distortion. Statistical distributions of the EVM over a large number of transmitted OFDM frames are gained from experimental measurements and analyses of idealized processes. The measurement results show that as the number of subcarriers is reduced, the distribution means are more affected by extreme values. This effect results in mean EVMs for signals with different numbers of subcarriers that are not dependent in the expected way on the statistical PAPR of the transmitted OFDM signals. Instead, it is shown that in regions of moderate distortion, the median of the EVM is more closely related to the statistical PAPR and to the required back-off for signals with different numbers of subcarriers. Index Terms-Error vector magnitude (EVM), orthogonal frequency division multiplexing (OFDM), radio-over-Þber (RoF).Philippos Assimakopoulos received the B.Eng. degree in electronic engineering from the University of Bath, Bath, U.K., in 2003, and the M.Sc. degree in broadband and mobile communication networks and Ph.D. degree in electronic engineering from the University of Kent, Canterbury, U. K., in 2007 and 2012, respectively. He is currently with the Broadband and Wireless Communications Group, University of Kent. His research interests include low-cost microwave RoF networks for indoor and outdoor applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Statistical Distribution of EVM Measurements for Direct-Modulation Radio-Over-Fiber Links Transporting OFDM Signals

Assimakopoulos

Nkansah

Gomes

et al. 2013

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

show abstract

“…In case of these new millimeter-wave systems significant effort is done to reduce the effects of multi-path fading and to have low-cost and small base stations matched to the demands made by the big number of mobile cells and high frequency applications [2]. To meet these requirements one of the best solutions could be the combination of OFDM digital modulation and the sub-carrier multiplexed optical transmission [3].…”

Section: Introductionmentioning

confidence: 99%

“…The ROF concept means to transport information over optical fiber by modulating the light with the radio signal. In such a system architecture feeding the mobile network by the signal of a mode-locked microchip laser, there is no need for a millimeter-wave local oscillator in the base-stations [2]. The mode-locking method generates all the carrier signals necessary for the fiber-optic transmission of millimeter-wave signals and for the millimeter-wave transmission of modulating information signal.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

PHY-DLL dialogue: cross-layer design for optical-wireless OFDM downlink transmission

Wang

2005

Network Architectures, Management, and Applications III

View full text Add to dashboard Cite

The use of radio over fiber to provide radio access has a number of advantages including the ability to deploy small, low-cost remote antenna units and ease of upgrade. And due to the great potential for increasing the capacity and quality of service, the combination of Orthogonal Frequency Division Multiplexing (OFDM) modulation and the sub-carrier multiplexed optical transmission is one of the best solutions for the future millimeter-wave mobile communication. And this makes the optimum utility of valuable radio resources essential. This paper devises a cross-layer adaptive algorithm for optical-wireless OFDM system, which takes into consideration not only transmission power limitation in the physical layer, but also traffic scheduling and user fairness at the data-link layer. According to proportional fairness principle and water-pouring theorem, we put forward the complete description of this cross-Layer adaptive downlink transmission 6-step algorithm. Simulation results show that the proposed cross-layer algorithm outperforms the mere physical layer adaptive algorithm markedly. The novel scheme is able to improve performance of the packet success rate per time chip and average packet delay, support added active users.

show abstract

“…Although a number of different spectral bands are possible, of particular interest is the 5.8GHz band as trails have already started in the UK to use this band for fixed wireless access services. The use of radio-over fibre techniques have been previously analysed mathematically [1,2]. Here we present an experimental analysis of the transport of OFDM signals of the kind used in 802.11a systems.…”

Section: Introductionmentioning

confidence: 99%