Polyphase filter with stack shift capability

Details Polyphase filter with stack shift capability Polyphase filter with stack shift capability

2006-08-22

2006-08-22

Patel, Jay K. (Department: 2634)

Pulse or digital communications

Testing

C375S340000, C455S203000, C455S303000, C370S310000

Reexamination Certificate

active

07095781

ABSTRACT:
A discrete Fourier transform (DFT) filter bank with stack shift capability, configured, for example, as an analyzer, but equally applicable to a synthesizer, and implemented as a polyphase filter. The DFT filter bank includes a complex modulator for multiplying the input signals x0(m), x1(m) . . . xM−1(m) by a complex modulator e−2πko(m). In order to keep the coefficients for the polyphase filter real, the coefficients are modulated by a DFT twiddle factor e−2πkoρ/M. The use of the DFT twiddle factor enables the hardware to be reduced significantly. For example, for an 8 phase203tap filter, only 8 selectable negators are required as opposed to211for known DFT filter banks.

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