1 research outputs found
Optimum Performance and Spectral Characterization of CE-OFDM Signals
Orthogonal frequency division multiplexing
(OFDM) modulations are very popular in wireless
communications due to their flexibility and good
performance over severely time-dispersive channels.
However, OFDM signals have large peak-to-average power
ratio (PAPR), which leads to amplification problems.
Constant envelope OFDM (CE-OFDM) techniques use an
OFDM signal to modulate the phase of a given carrier,
allowing a 0 dB PAPR, with all inherent advantages.
However, the phase modulator is a nonlinear device
that can lead to performance degradation. In this paper,
we take advantage of the Gaussian characteristics of
OFDM signals to characterize analytically CE-OFDM
signals, both in terms of power spectral density (PSD)
and optimum asymptotic performance