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Power Efficiency in Broadband Wireless Communications
book

Power Efficiency in Broadband Wireless Communications

by Pooria Varahram, Somayeh Mohammady, Borhanuddin Mohd Ali, Nasri Sulaiman
August 2014
Intermediate to advanced content levelIntermediate to advanced
340 pages
8h 49m
English
CRC Press
Content preview from Power Efficiency in Broadband Wireless Communications
59
4
pEak-to-avEragE
poWEr ratio
4.1 Introduction
As explained in Chapter 2, the orthogonal frequency division
multiplexing (OFDM) signal is created by the sum of several sinusoidal
signals. is process is performed by the inverse fast Fourier transform
(IFFT) in the OFDM transmitter.
e basic equations of the FFT and the IFFT can be given by
,0,..., 1
1
1
2/
Xk xnekN
n
N
jknN
() ()
==
=
−π
(4.1)
()
1
() ,0,..., 1
1
1
2/
xn
N
XkenN
n
N
jknN
==
=
−π
(4.2)
where N is the transform size or the number of sample points in the
data frame and
j 1=−
. X(k) is the frequency output of the FFT at
kth point where k = 0, 1, …, N – 1, and x(n) is the time sample at nth
point with ...
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Publisher Resources

ISBN: 9781466595484