A finite impulse response filter for waveform shaping of digital orthogonal amplitude modulation symbols

摘要

1. The technical field to which the invention described in the claims belongs;The present invention relates to a finite impulse response filter.;2. Technical challenges to be solved by the invention;The present invention is to provide a finite impulse response filter that reduces the critical path by replacing the multiplier with a multiplexer, operating the input end of the waveform shaping finite impulse response filter at the same input speed as the symbol encoder, and changing the position of the delay element.;3. The point of the solution of the invention;According to the present invention, each value obtained by multiplying a filter tap coefficient outputted according to symbol data by a symbol value is cyclically output in accordance with a count signal, so that the input operation speed is made equal to the output speed during one symbol period without insertion of zero Finite impulse response means; And sequentially outputting the output values of the first finite impulse response means and sequentially outputting a value obtained by multiplying a filter tap coefficient output according to symbol data inputted from outside and a symbol value by a symbol value, And at least one second finite impulse response means for reducing the critical path by adding one value to the output.;4. Important Uses of the Invention;The present invention is used for waveform shaping of symbols.