Patent ID: 6246729
Filing Date: 2001-06-12
Classification: H04L

Abstract:
A method for decoding a phase encoded data signal, the method comprising the steps of:a) windowing the data signal to reduce sidelobes in a frequency spectrum of the data signal so as to mitigate interference with other signals;b) transforming the windowed data signal into real and imaginary frequency components thereof;c) converting the real and imaginary frequency components of the data signal into phase and magnitude information with respect thereto;d) summing a plurality of frequencies which substantially comprise noise to provide a magnitude of a noise floor;e) comparing the magnitude of the data signal to the magnitude of the noise floor so as to provide a signal-to-noise ratio;f) comparing the signal-to-noise ratio to a threshold value and facilitating further processing of the signal when the signal-to-noise ratio exceeds the threshold value;g) identifying a maximum magnitude of the data signal;h) calculating a phase correction and adding the phase correction to the data signal;i) differentially demodulating the data signal;j) multiplying the demodulated data signal with a correlation sequence to form a product signal; andk) hard limiting the product signal and converting the product signal to a binary number.