Complex bandpass digital filter

Details Complex bandpass digital filter Complex bandpass digital filter

1989-06-01

1990-08-28

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

3647241, H04B 110

Patent

active

049531840

ABSTRACT:
An improved complex bandpass digital filter is disclosed. According to the invention, a complex bandpass digital filter having symmetric complex coefficients is implemented using a ROM look-up table. In operation, an input bit stream is latched at a desired decimation rate and the resulting latched bits are then used to address a ROM according to the following two-cycle process: First, the bits are applied in nomal order to the ROM to obtain the real (in phase) portion of the filter output. Second, the bits are bit-reversed and then applied to the same ROM to obtain the imaginary (quadrature) portion of the filter output. Thus, complex outputs are obtained as a time-multiplexed stream from one ROM, resulting in reduced ROM storage capacity requirements.

REFERENCES:
patent: 4691292 (1987-09-01), Rothweiler

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