Continuously variable if sampling method for digital data transm

Details Continuously variable if sampling method for digital data transm Continuously variable if sampling method for digital data transm

1995-06-07

1997-12-09

Chin, Stephen

Pulse or digital communications

Receivers

332103, H03K 900, H04L 2706, H04L 2714, H04L 2722

Patent

active

056967969

ABSTRACT:
A sampling method, denoted continuously variable IF sampling (CVIFS), implemented in digital transmission and reception components is characterized by sampling a bandpass signal which is centered at an intermediate frequency f.sub.IF that is related to both the data transmission symbol rate (R.sub.s) and sample rate (NR.sub.s) by integer ratios. Moreover, the CVIFS method is characterized in that the sample rate NR.sub.s is constrained to be four times the IF center frequency, and both the sample rate NR.sub.s and the IF center frequency are constrained to be within a range of a factor of 1.5 of their maximum values. To maintain this high sample rate as the data symbol rate is lowered, a "gear shifting" technique is utilized whereby the integer number of samples-per-symbol, N, is increased as the symbol rate decreases. Moreover, the sample rate NR.sub.s is always between 3.0 to 4.5 times the maximum data symbol rate (R.sub.smax), and the IF center frequency is always between 3/4 to 9/8 times (R.sub.smax), irrespective of the actual data rate R.sub.s.

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