UWB communication receiver feedback loop
A novel technique and structure that maximizes the extraction of information from reference pulses for UWB-TR receivers is introduced. The scheme efficiently processes an incoming signal to suppress different types of UWB as well as non-UWB interference prior to signal detection. Such a method and system adds a feedback loop mechanism to enhance the signal-to-noise ratio of reference pulses in a conventional TR receiver. Moreover, sampling the second order statistical function such as, for example, the autocorrelation function (ACF) of the received signal and matching it to the ACF samples of the original pulses for each transmitted bit provides a more robust UWB communications method and system in the presence of channel distortions.
1 . An ultra-wideband (UWB) communication receiver, comprising:
a feedback amplifier having an input line and an output line, said input line electrically coupled to a common input line, wherein said feedback amplifier, said input line and said output line are configured as a feedback loop so as to loop at least once, one or more transmitted pulse pairs received on said common input line, wherein said transmitted pulse pairs have a predetermined encoded data and a predetermined symbol repetition rate;
at least one delay electrically coupled to said common input line and configured to reproduce a predetermined lag interval D of said one or more transmitted pulse pairs;
a signal multiplier electrically coupled to said at least one delay and said output line of said feedback loop for multiplying delayed versions having said lag interval D of said transmitted pulse pairs and one or more of said looped transmitted pulse pairs; and
an integrator configured to integrate a product signal output by said signal multiplier, wherein an integrator output is analyzed to determine an output signal that indicates said predetermined encoded data.
2 . The receiver of claim 1 , wherein a gain of said feedback loop is less than 1.
3 . The receiver of claim 1 , wherein said feedback loop averages out interfering narrowband signals and white noise by adjusting a feedback loop travel time delay to substantially match said predetermined symbol repetition rate of said received pulse pairs.
4 . The receiver of claim 1 , wherein said encoding includes a relative polarity of a received transmitted data pulse with respect to a received transmitted reference pulse.