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Modelling and equalization of rapidly fading channels
Author(s) -
Tsatsanis Michail K.,
Giannakis Georgios B.
Publication year - 1996
Publication title -
international journal of adaptive control and signal processing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.73
H-Index - 66
eISSN - 1099-1115
pISSN - 0890-6327
DOI - 10.1002/(sici)1099-1115(199603)10:2/3<159::aid-acs346>3.0.co;2-m
Subject(s) - fading , multipath propagation , channel (broadcasting) , cyclostationary process , computer science , fading distribution , equalization (audio) , exponential function , algorithm , exploit , electronic engineering , mathematics , control theory (sociology) , telecommunications , engineering , rayleigh fading , artificial intelligence , mathematical analysis , computer security , control (management)
Basis expansion ideas are employed in order to equalize frequency‐selective, rapidly fading channels. For certain multipath fading channels (e.g. the mobile radio channel), the time variations of the coefficients can be modelled as a combination of a small number of complex exponentials, under the assumption of linearly changing path delays. Based on this observation, novel adaptive and decision feedback algorithms are derived which exploit such an explicit modelling of the channel's variations. The problem of estimating the frequencies of the exponentials is also addressed using second‐ and higher‐order cyclic statistics. By integrating ideas from cyclostationary signal analysis, both batch and recursive methods are developed. Finally, some illustrative simulations are presented.