Phase-encoded data signal demodulator

Details Phase-encoded data signal demodulator Phase-encoded data signal demodulator

H - Electricity

04

L

325/72, 340/72

H04L 1/00 (2006.01) H04L 25/06 (2006.01) H04L 25/49 (2006.01) H04L 7/033 (2006.01)

Patent

CA 1157120

-25- ABSTRACT A demodulator is described for demodulating phase- encoded data signals transmitted on a noisy communication channel, such as, for example, radio communication chan- nels of a radio communication system. The demodulator includes a digital phase-locked loop for phase-locking to the mid-bit transitions of the phase-encoded data signal, which, in the preferred embodiment is encoded according to the well known Manchester coding format, and further includes demodulating circuitry for sampling the phase- encoded data signal a predetermined number of times, weighting the samples according to predetermined weight- ing factors, totalizing the weighted samples for each bit interval and comparing the totalized samples to a prede- termined threshold value for ascertaining the logical state of each bit of the phase-encoded data signal. For example, if the magnitude of the totalized samples is greater than or equal to the threshold value, a logical one state may be provided for the decoded data signal, and, if the magnitude of the totalized samples is less than the threshold value, a logical zero state may be provided for the decoded data signal. In preferred embodiments of the present invention, the weighting factors assigned to each sample may be either binary weighted or sine weighted, although any suitable weight- ing factors may be utilized depending on the characteris- tics of the phase-encoded data signal. The phase-encoded -26- data signal demodulator embodying the present invention is particularly well adapted for demodulating high speed, phase-encoded data signals transmitted over radio channels to mobile and portable stations of a radio communication system.

368037

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