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

Assimakopoulos, Philippos, Nkansah, Anthony, Gomes, Nathan J., Wake, David (2013) Statistical Distribution of EVM Measurements for Direct-Modulation Radio-Over-Fiber Links Transporting OFDM Signals. IEEE Transactions on Microwave Theory and Techniques, 61 (4). pp. 1709-1717. ISSN 0018-9480. (doi:10.1109/TMTT.2013.2247615) (KAR id:35559)

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http://dx.doi.org/10.1109/TMTT.2013.2247615

Abstract

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.

Item Type: Article
DOI/Identification number: 10.1109/TMTT.2013.2247615
Uncontrolled keywords: Error vector magnitude (EVM); orthogonal frequency division multiplexing (OFDM); radio-over-fiber RoF
Subjects: T Technology
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: Tina Thompson
Date Deposited: 21 Oct 2013 13:08 UTC
Last Modified: 16 Feb 2021 12:47 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/35559 (The current URI for this page, for reference purposes)
Assimakopoulos, Philippos: https://orcid.org/0000-0002-2550-1317
Gomes, Nathan J.: https://orcid.org/0000-0003-3763-3699
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