Patent ID: 6092093
Filing Date: 2000-07-18
Classification: H04J

Abstract:
A frequency multiplexer device for combining a plurality (n) of single signals of bandwidth (B), sampled with a sampling frequency (fa/n), said frequency multiplexer device comprisingmeans for performing a Fourier transformation (FFT) of said single signals of said bandwidth (B) to obtain a plurality of complex input signals, each of said complex input signals having an imaginary portion and a real portion; anda plurality of means for generating an output signal for multiplexing from the imaginary portion and the real portion of each of said complex input signal;wherein each of said means for generating said output signal includes respective different chains (111) of serially connected delay elements (D,110) for delaying said real portion and said imaginary portion to form differently delayed imaginary signal portions and differently delayed real signal portions;means for combining (+) and weighting pairs of said differently delayed imaginary signal portions and said differently delayed real signal portions to be weighted with an identical one of a plurality of different weighting factors (.gamma.h(5), -.gamma.h(1), .gamma.h(3)) to form respective weighted combined signals for each of said different weighting factors, each of said means for combining and weighting comprising a series circuit branch including an adder (112) and a single multiplier (113) connected to said adder arranged to receive an addition result from said adder, said single multiplier (113) comprising means for weighting said addition result of said adder with said one of said weighting factors;means for quantization of said imaginary and real portions of said complex input signals;means for generating a correction signal for mean quantization errors;means for feeding said correction signal into one of said series circuit branches between said adder and said single multiplier in said series circuit branch; andmeans (114) for combining resultant signals from said multipliers to obtain said output signal of said means for generating for multiplexing.