H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 15/00 (2006.01) H04B 1/40 (2006.01)
Patent
CA 2386053
A method of communication in an environment having repetitive noise where the signal bit rate of the incoming signal is substantially an integer multiple of the half-wave frequency of the alternating current wave form, the method including the steps of in a receiver, de-modulating an incoming signal containing signal bits by taking digital samples of the incoming signal so as to demodulate the incoming signal into separate x and y channels, the x and y channels approximating respectively, a co-sine and sine wave, summing consecutive groups of the samples from the x and y channels so as to determine corresponding x and y channel points, wherein each group of the consecutive groups contains substantially the same number of the samples, within the receiver, defining at least first and second demi- bits wherein each demi-bit of the first and second demi-bits is of the same length and wherein the first and second demi-bits together, or integer multiples of the first and second demi-bits together, are the same length as one signal bit of the signal bits, using the x and y channel points within the demi-bits to calculate an average phase and an average magnitude over each the demi-bit: so as to produce a first bit channel of the y channel points when averaged over the first demi-bits, and a first channel of the x channel points when averaged over the first demi-bits, and so as to produce a second bit channel of the y channel points when averaged over the second demi-bits, and a second channel of the x channel points when averaged over the second demi-bits, determining the resulting phase and magnitudes of the first demi-bits of the first bit channel and the resulting phase and magnitudes of the second demi-bits of the second bit channel, comparing the magnitudes of the first and second bit channels and choosing the bit channel having the largest overall magnitude as the bit channel from which data is to be read, reading data from the bit channel from which data is to be read by determining phase angles in that bit channel, wherein the phase angles indicate corresponding phase-shift keyed data bits as determined by rejecting phase angles which fall into phase-shift angle fail regions interposed between ranges of acceptable phase-shift angles.
Carroll Sean C.
Hubert Michael
Offenwanger Peter J.
Rogall Donovan J.
Carroll Sean C.
Edwards Antony C.
Hubert Michael
Offenwanger Peter J.
Rogall Donovan J.
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