Generalized polyphase channelization system

Details Generalized polyphase channelization system Generalized polyphase channelization system

2008-07-22

2008-07-22

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

Reexamination Certificate

active

10864201

ABSTRACT:
A computation efficient polyphase channelization system enables one of many user FDMA signals to be channelized through multiple FFT response frequency bands forming an aggregate frequency band where K-point FFT channels are greater than the decimation factor M to produce FFT overlapped responses that have a smooth aggregate response without disjointed band gaps for reduced distortion using a clockwise commutator having M channels feeding M filter blocks, each of which having β polyphase filters, and having a ring switch to provide smooth filter responses that then drive β K-point FFTs to provide a β set of K vector FFT responses that are then combined in a post processing system for producing K channelized outputs.

REFERENCES:
patent: 5550872 (1996-08-01), Liberti et al.
patent: 6522243 (2003-02-01), Saulnier et al.
patent: 6735221 (2004-05-01), Cherubini
patent: 2004/0127223 (2004-07-01), Li et al.

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