Pulse shaping filter for received digital transmissions using ph

Details Pulse shaping filter for received digital transmissions using ph Pulse shaping filter for received digital transmissions using ph

1992-12-31

1997-08-12

Tse, Young T.

Pulse or digital communications

Transmitters

Antinoise or distortion

375371, 327156, 327284, H04L 2503

Patent

active

056573537

ABSTRACT:
A pulse shaping filter for shaping pulses received at a specified data rate is disclosed. The filter has a desired impulse response associated with a plurality of sampled values. The filter includes a sampling circuit responsive to the input pulses, such that each pulse is sampled at a desired sampling rate. A delay circuit provides a plurality of delayed versions of the sampled pulse, wherein said sampled pulse propogate through said delay circuit at a unit delay time substantially equal to the period of the desired sampling rate. A plurality of resistors are coupled to the delay circuit, each resistor providing a weighing coefficient by which the delayed versions of the sampled pulses are multiplied to provide a plurality of weighed delayed pulses. A summing circuit is adapted to add all said weighed delayed pulses to provide shaped pulses. The resistors are selected such that each sum of said weighed delayed pulses as the pulses are propogated through the delay circuit is substantially equal to a corresponding sampled value of said impulse response.

REFERENCES:
patent: 4646327 (1987-02-01), Kojima et al.
patent: 4737969 (1988-04-01), Steel et al.
patent: 4757519 (1988-07-01), Collison et al.
patent: 5068874 (1991-11-01), Leitch
patent: 5253272 (1993-10-01), Jaeger et al.
patent: 5299230 (1994-03-01), Jaeger et al.
J. Cooper, "Sine Squared Shaping of Sync and Drive Pulses," IEEE Trans. on Broadcasting, vol. 36 No. 2, pp. 162-169, Jun. 1990.

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