Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1996-10-17
1998-11-17
Chin, Stephen
Pulse or digital communications
Receivers
Interference or noise reduction
375348, H04B 710, H04L 102
Patent
active
058387420
ABSTRACT:
Diversity path signals, each comprising time division multiplexed symbols in a time slot including known symbols, are combined with respective weights to reduce co-channel interference. Initial weights are determined, using a window on the known symbols, to optimize signal to interference plus noise ratio. These weights are used to determine symbols adjacent to the window, and the window is changed to include determined symbols and the weights redetermined. This process is repeated with the window being moved progressively, preferably with successive positions overlapping, throughout the time slot. The initially known symbols can comprise synchronization symbols and/or CDVCC (coded digital verification color code) symbols. Desirably, both can be used with respective windows being moved in opposite directions through symbols between them to provide two results for each such symbol, the better one of which is selected in dependence upon a monitoring of possibly averaged errors for the symbols.
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"Evaluation of Diversity Schemes in TDMA Digital Mobile Radio", R.D'Avella et al., Communications: Connecting the Future, San Diego Dec.2-5, 1990,Institute of Electrical and Electronics Engineers, vol. 1 of 3, Dec. 2, 1990,pp.490-494.
Chin Stephen
Ghayour Mohammad
Haley R. John
Northern Telecom Limited
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