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A Novel ST-DFT based M-ary FSK Demodulation MethodFrequency Sequence Estimationfor LEO Satellite Communications
Attapol WANNASARNMAYTHA Shinsuke HARA Norihiko MORINAGA
IEICE TRANSACTIONS on Communications
Publication Date: 1997/01/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Advances in Satellite Communications toward Multimedia Era)
Category: Modem and Coding
ST-DFT, frequency offset, LEO, instantaneous energy spectrum, frequency sequence estimation,
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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.