Method for correcting waveform data in digital signal modulation

Details Method for correcting waveform data in digital signal modulation Method for correcting waveform data in digital signal modulation

1990-07-23

1991-12-17

Olms, Douglas W.

Pulse or digital communications

Repeaters

Testing

375 34, 375 58, 375 99, H04B 1404

Patent

active

050739018

ABSTRACT:
A method for correcting quantized waveform data which are formed by quantizing a baseband waveform, so optimized as to make a sum of errors included in a single bit internal of input digital data smaller than one quantization step, and are output as the baseband waveform which is to be accumulated or integrated in the requirement of the system (such as frequency-to-phase conversion). Since an accumulated sum of the quantized waveform data has some deriation from the real baseband waveform when those quantized waveform data are accumulated so as to generate phase information from frequency information, the quantized waveform data have to be corrected previously. For the purpose of reducing the accumulated error, this method involves the steps of defining states corresponding to input data patterns, establishing simultaneous equations corresponding to state transition routes respectively, solving the equations, and deciding correcting values for the quantized data.

REFERENCES:
patent: 4736387 (1988-04-01), Tzou
patent: 4922508 (1990-05-01), Moriya

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