Recursive filters for polyphase structures

Details Recursive filters for polyphase structures Recursive filters for polyphase structures

1996-12-19

1999-07-20

Chan, Jason

Multiplex communications

Generalized orthogonal or special mathematical techniques

Fourier transform

375350, 36472401, 36472417, 364726, H04J 300

Patent

active

059264551

ABSTRACT:
Polyphase channelizing transmitters convert multiple signal channels into a single stream for transmission and corresponding polyphase channelizing receivers process the received stream to recover signals corresponding to the original signal channels. The filter transfer functions for both the transmitters and receivers are designed to have non-recursive numerators and recursive denominators. Such filters can be realized using non-recursive (e.g., finite impulse response (FIR)) filters and recursive (e.g., infinite impulse response) filters on opposite sides of a Fourier transform. For a given application, polyphase structures of the present invention may require fewer coefficients to implement than conventional (e.g., FIR-based) solutions and will therefore be less complex and less expensive.

REFERENCES:
patent: 4107470 (1978-08-01), Maruta
patent: 4785447 (1988-11-01), Ichiyoshi
patent: 5757867 (1998-05-01), Caulfield et al.

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