Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1993-01-19
1994-11-22
Chin, Stephen
Pulse or digital communications
Spread spectrum
Direct sequence
375 14, 36472416, H04B 110
Patent
active
053675401
ABSTRACT:
A transversal filter has a transfer function for which a zero point occurs outside a unit circle on z plane and thus the output waveform has a ringing characteristic having a change from negative to positive around a precursor and before a main cursor and is associated and integrated with another transversal filter, thereby forming a waveform shaping decimation filter or a pulse shaping high-pass filter. The waveform decimation filter can eliminate a high frequency noise, changes a high frequency input data to a low frequency output data, and performs a waveform shaping operation. Therefore it cannot require a pulse shaping filter separated from the decimation filter. The pulse shaping high-pass filter includes a pulse shaping filter whose number of the taps is decreased and performs high-pass filter function. A pulse shaping filter whose number of the taps is decreased can be used separately from the high-pass filter.
REFERENCES:
patent: 5124705 (1992-06-01), Voorman
patent: 5126961 (1992-06-01), Garverick
Ma et al. "Polyphase IIR Decimation Filter Design for Oversampled A/D Converters at Approximately Linear Phase". IEEE Trans. on Circuits & Systems vol. 39 No. 8 Aug. 1992.
Park, "Multistage Decimation Filter Design Technique for High-Resolution Sigma-Delta A/D Converters" IEEE Trans. on Instrumentation & Measurement vol. 40 No. 6 Dec. 1992.
"Review and Analytical Comparison of Recursive and Nonrecursive Equalization Techniques for PAM Transmission Systems", Nicholas J. Lynch-Aird, IEEE, vol. 9, No. 6, Aug. 1991.
Awata Yutaka
Itokawa Hiroaki
Kakuishi Mitsuo
Koizumi Nobukazu
Kurosaki Yuko
Chin Stephen
Fujitsu Limited
Webster Bryan
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