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    Analysis of Improved µ-Law Companding Technique for OFDM Systems

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    ali_et_al_2017.pdf (766.4Kb)
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    Publication date
    2017-08-21
    Author
    Ali, N.
    Almahainy, R.
    Al-Shabili, A.
    Almoosa, N.
    Abd-Alhameed, Raed A.
    Keyword
    Orthogonal frequency division multiplexing; OFDM; Companding; PAPR reduction; Field Programmable Gate Array; FPGA
    Rights
    © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
    Peer-Reviewed
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    Abstract
    High Peak-to-Average-Power Ratio (PAPR) of transmitted signals is a common problem in broadband telecommunication systems using an orthogonal frequency division multiplexing (OFDM) modulation scheme, as it increases transmitter power consumption. In consumer applications where it impacts mobile terminal battery life and infrastructure running costs, this is a major factor in customer satisfaction. Companding techniques have been recently used to alleviate this high PAPR. In this paper, a companding scheme with an offset, amidst two nonlinear companding levels, is proposed to achieve better PAPR reduction while maintaining an acceptable bit error rate (BER) level, resulting in electronic products of higher power efficiency. Study cases have included the effect of companding on the OFDM signal with and without an offset. A novel closed-form approximation for the BER of the proposed companding scheme is also presented, and its accuracy is compared against simulation results. A method for choosing best companding parameters is presented based on contour plots. Practical emulation of a real time OFDM-based system has been implemented and evaluated using a Field Programmable Gate Array (FPGA).
    URI
    http://hdl.handle.net/10454/13100
    Version
    Accepted Manuscript
    Citation
    Ali N, Almahainy R, Al-Shabili A et al (2017) Analysis of improved μ-law companding technique for OFDM systems. IEEE Transactions on Consumer Electronics. 63(2): 126-134.
    Link to publisher’s version
    https://doi.org/10.1109/TCE.2017.014753
    Type
    Article
    Collections
    Engineering and Informatics Publications

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