Title :
Constant envelope OFDM phase modulation: spectral containment, signal space properties and performance
Author :
Thompson, Steve C. ; Ahmed, Ahsen U. ; Proakis, John G. ; Zeidler, James R.
Author_Institution :
Center for Wireless Commun., Univ. of California San Diego, La Jolla, CA, USA
Abstract :
A class of constant envelope OFDM phase modulated (OFDM-PM) signals is studied. The motivation behind OFDM-PM is to alleviate the high peak-to-average power ratio of conventional OFDM systems. Power density spectrum plots and fractional out-of-band power curves are given. For small modulation indices, the OFDM-PM signals are shown to be more spectrally contained than conventional OFDM. The signal space is studied by considering the correlation properties of the OFDM-PM signals. A performance bound on the optimum OFDM-PM receiver is compared to simulation results. Also, a sub-optimum phase demodulator receiver is analyzed and an AWGN performance approximation is compared to simulation results. It is shown that for a small modulation index and high signal-to-noise ratio, the sub-optimum receiver performs close to the optimum receiver.
Keywords :
AWGN channels; OFDM modulation; correlation theory; demodulators; military communication; phase modulation; radio receivers; spectral analysis; AWGN performance approximation; constant envelope OFDM phase modulation; correlation properties; fractional out-of-band power curves; military communication; modulation indices; optimum OFDM-PM receiver; peak-to-average power ratio; performance bound; power density spectrum plots; signal space properties; signal-to-noise ratio; spectral containment; sub-optimum phase demodulator receiver; AWGN; Baseband; Demodulation; Discrete Fourier transforms; Ink; Intermodulation distortion; OFDM modulation; Peak to average power ratio; Phase modulation; Wireless communication;
Conference_Titel :
Military Communications Conference, 2004. MILCOM 2004. 2004 IEEE
Print_ISBN :
0-7803-8847-X
DOI :
10.1109/MILCOM.2004.1495013
