Abstract
AbstractThis paper describes a new automatic equalizer for digital subscriber loops. The new equalizer is composed of a √f equalizer and a BT equalizer. The √f equalizer is a new type of linear equalizer which is based on the approximate theory of exponential orthogonal functions. The BT equalizer is a decision‐feedback equalizer. Subscriber loops can be closely approximated to RC‐dis‐tributed constant circuits. Since the new √f equalizer is composed of a linear combination of RC low‐pass circuits, the required hardware is small in scale. By adjusting the multiplication weights for both the √f equalizer and the BT equalizer, the equalizing characteristics can be controlled continuously. Moreover, since the multiplication weights of the √f equalizer are performed digitally by C‐2C ladder circuits and the main part of the BT equalizer is composed of digital circuits, the equalizing characteristics can be controlled by a digital controller and neither analog multiplication circuits nor analog delay circuits are required. As a result of our trial manufacture and performance tests that were conducted in a 320 Kb/s time‐division burstmode transmission system, it has been verified that this automatic equalizer has sufficient equalizing capabilities.
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More From: Electronics and Communications in Japan (Part I: Communications)
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