Spectrally encoded, multicarrier PSK communication in a multipath channel

• Main Authors: Gaona, C.M., Mills, R.F., Temple, M.A., Hale, T.B.
• Format: Conference Proceeding
• Language: English
• Subjects: Computer languages; Fading; Frequency domain analysis; Frequency shift keying; Interference; Multipath channels; Performance analysis; Phase shift keying; Rayleigh channels; Signal analysis
• ISSN: 2155-7195; 2155-7209
• DOI: 10.1109/DASC.2005.1563305

This research examines the performance of a spectrally encoded, multicarrier, phase shift keying communications system in a frequency-selective, slowly-fading (FSSF) Rayleigh multipath channel. The literature discusses several frequency domain techniques including spectral encoding that have been used for interference avoidance and multiple access techniques. This research applies spectral encoding to mitigate the effects of multipath fading. Analysis and Matlab/spl reg/ simulations compare the performance of spectrally encoded and unencoded signals through a multipath fading channel using an L-diversity RAKE receiver. Encoded signals take on the spectral shape of the fading channel transfer function magnitude spectrum. Unencoded signals have a flat magnitude spectrum. Research results indicate for diversities (L) ranging between 2 and 50, spectrally encoded signals need 1.0 to 2.75dB less transmitted normalized bit energy to noise power spectral density ratios (E/sub b//N/sub o/) to achieve the same probability of bit error (P/sub b/) as unencoded signals.