Adaptive corrector operating in frequency domain
Abstract
An interferenceimmune corrector for a signal converter with automatic regulation of adaptation speed is described which operates in the frequency domain with fast convergence and high signaltonoise ratio. It contains an analogtodigital converter, a demodulator, and a filter array with equidistant spacing of center frequencies, three multipliers and two summators, as well as a reference signal generator, a frequency divider, a counter, and a noise meter. Filtering is done by a npoint Fourier transformation or bunching with a memory at the filter input followed by inverse Fourier transformation or debunching, respectively. The algorithm of corrector operation in the frequency domain can be constructed heuristically by an analog to the complex algorithm of minimizing the meansquare error in the time domain. Each weight factor can be processed independently and only once per Fourier transformation cycle, which ensures fast convergence without preliminary phase correction even with large distortions in the communication channel.
 Publication:

USSR Rept Electron Elec Eng JPRS UEE
 Pub Date:
 November 1984
 Bibcode:
 1984RpEEE.......19R
 Keywords:

 Adaptive Filters;
 Bunching;
 Channels (Data Transmission);
 Communication;
 Fourier Transformation;
 Signal To Noise Ratios;
 Analog To Digital Converters;
 Convergence;
 Correction;
 Data Transmission;
 Electronics and Electrical Engineering