A Novel ST-DFT based M-ary FSK Demodulation MethodFrequency Sequence Estimationfor LEO Satellite Communications

Attapol WANNASARNMAYTHA  Shinsuke HARA  Norihiko MORINAGA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E80-B   No.1   pp.33-39
Publication Date: 1997/01/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Advances in Satellite Communications toward Multimedia Era)
Category: Modem and Coding
Keyword: 
ST-DFT,  frequency offset,  LEO,  instantaneous energy spectrum,  frequency sequence estimation,  

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Summary: 
This paper proposes a novel M-ary FSK demodulation scheme using the Short Time Discrete Fourier Transform (ST-DFT) analysis named Frequency Sequence Estimation (FSE) for low earth orbit (LEO) satellite-based personal multimedia communications. The FSE is a kind of the Viterbi algorithm, searching for the maximum likely frequency path using the instantaneous ST-DFT output as a metric. It is based on the fact that the discrete time-frequency representation of the received signal can be interpreted as a trellis diagram. The proposed method has the excellent transmission performance and spectral efficiency, as well as its own hardware simplicity and frequency offset insensitivity.