Abstract
Complex digital filter techniques are briefly discussed. Three designs of a special class of complex filters called orthogonal filters are presented: the orthogonal direct form, minimum norm, and optimal state-space filters. The direct-form structure has previously been used in the design of transmultiplexers, whereas the minimum-norm and optimal state-space structures are new. The noise and stability performance of each structure are discussed and compared.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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