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

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 dire...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2013-04, Vol.61 (4), p.1709-1717
Main Authors: Assimakopoulos, P., Nkansah, A., Gomes, N. J., Wake, D.
Format: Article
Language:English
Subjects:
Access methods and protocols, osi model
Amplifiers
Applied sciences
Circuit properties
Diode lasers
Distortion measurement
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Error vector magnitude (EVM)
Exact sciences and technology
Modulation
orthogonal frequency division multiplexing (OFDM)
Peak to average power ratio
Radio frequency
radio-over-fiber (RoF)
Telecommunications
Telecommunications and information theory
Teleprocessing networks. Isdn
Vectors
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Summary: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-fiber link is used in experiments as an example 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.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2013.2247615