Arrangement for combatting intersymbol interference and noise

Details Arrangement for combatting intersymbol interference and noise Arrangement for combatting intersymbol interference and noise

H - Electricity

04

L

340/72

H04L 25/03 (2006.01)

Patent

CA 1320997

PHN 12.013 20.6.1987 ABSTRACT: Arrangement for combatting intersymbol interference and noise. An arrangement for combating intersymbol interference and noise introduced into a data signal transmitted at a symbol rate 1/T by a transmission channel having a memory span LT corresponding to a number of L consecutive data symbols, comprises a receive filter (RF), a first decision circuit (ID) for forming preliminary symbol decisions in response to the transmitted data signal, a second decision circuit (FD) for forming final symbol decisions, means (FFS and FBS) for compensating pre- and post-cursive inter- symbol interference, and a combining circuit (AD) for for- ming the input signal for the second decision circuit (FD). By selecting in these compensating means the memory span MT of the feedforward section (FFS), and possibly also the memory span NT of the feedback section (FBS), to be smaller than the memory span LT of the transmission channel, a simplification of the implementation of the arrangement is achieved, whereas the attainable transmis- sion quality does not appreciably differ from the transmission quality attainable with MT=NT=LT, (Fig.2).

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