Computation of the continuous-time PAR of an OFDM signal with BPSK subcarriers

A procedure for computing the continuous-time peak-to-average power ratio (PAR) of an orthogonal frequency-division multiplexing (OFDM) signal, with binary phase-shift keying (BPSK) subcarriers, is developed. It is shown that the instantaneous envelope power function (EPF) can be transformed into a...

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Bibliographic Details
Published in:IEEE communications letters 2001-05, Vol.5 (5), p.185-187
Main Author: Tellambura, C.
Format: Article
Language:English
Subjects:
Applied sciences
Binary phase shift keying
Chebyshev approximation
Computation
Derivatives
Digital TV
Exact sciences and technology
Frequency division multiplexing
Information, signal and communications theory
Mathematical analysis
Mathematical models
Multiplexing
OFDM
Orthogonal Frequency Division Multiplexing
Oversampling
Peak to average power ratio
Phase shift keying
Polynomials
Roots
Sampling methods
Signal and communications theory
Subcarriers
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
TV broadcasting
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Summary:A procedure for computing the continuous-time peak-to-average power ratio (PAR) of an orthogonal frequency-division multiplexing (OFDM) signal, with binary phase-shift keying (BPSK) subcarriers, is developed. It is shown that the instantaneous envelope power function (EPF) can be transformed into a linear sum of Chebyshev polynomials. Consequently, the roots of the derivative of EPF can be obtained by solving a polynomial. Using the procedure to evaluate the difference between the continuous-time and discrete-time PAR, it is shown that an oversampling factor of four is accurate.
ISSN:1089-7798
1558-2558
DOI:10.1109/4234.922754