Multi-pulse multi-delay (MPMD) multiple access modulation for UWB
First Claim
1. An ultra-wideband (UWB) receiver, capable of correlating and multi-sampling received pulses, comprising:
- a primary delay to reproduce a lag interval Dn of a transmitted pulse pair; and
one or more secondary delays to produce one or more non-zero lag intervals dnk, wherein a plurality of second order statistical values of each of said received pulses produced at said primary and at said one or more secondary delays are matched to a plurality of second order statistical values of a predetermined reference pulse to determine an output signal indicative of encoded information.
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Abstract
A new modulation scheme in UWB communications is introduced. This modulation technique utilizes multiple orthogonal transmitted-reference pulses for UWB channelization. The proposed UWB receiver samples the second order statistical function at both zero- and non-zero lags and matches the samples to stored second order statistical functions, thus sampling and matching the shape of second order statistical functions rather than just the shape of the received pulses. Sampling of non-zero second order statistical function lags is a significant new approach. Since UWB pulses experience channel distortion due to noise, fading and multipath, their shape can be quite different at the receiver, making the pulse detection difficult. However, second order statistical functions preserve their shape despite channel distortion. Therefore, 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 in the presence of channel distortions.
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Citations
46 Claims
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1. An ultra-wideband (UWB) receiver, capable of correlating and multi-sampling received pulses, comprising:
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a primary delay to reproduce a lag interval Dn of a transmitted pulse pair; and
one or more secondary delays to produce one or more non-zero lag intervals dnk, wherein a plurality of second order statistical values of each of said received pulses produced at said primary and at said one or more secondary delays are matched to a plurality of second order statistical values of a predetermined reference pulse to determine an output signal indicative of encoded information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An ultra-wideband (UWB) receiver, capable of correlating and multi-sampling received chirp pulses, comprising:
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a primary delay to reproduce a lag interval Dn of a transmitted chirp pulse pair, one or more secondary delays to produce one or more non-zero lag intervals dnk of said received pulses, a plurality of pulse multipliers and pulse integrators designed to generate a plurality of autocorrelation functions of said received pulses at said primary delay and at said one or more secondary delays, a bank of filters to match a plurality of stored sampled autocorrelation functions of one or more transmitted chirp pulses with said generated autocorrelation functions at said primary and said one or more secondary delays of said received chirp pulses; and
a hard decision block designed to produce one or more output bits based on said matched sampled autocorrelation functions and said generated autocorrelation functions of said received pulses indicative of encoded information of said transmitted pulses. - View Dependent Claims (14, 15, 16, 17)
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18. An ultra-wideband (UWB) system, comprising:
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a transmitter capable of generating one or more encoded pulses separated by one or more predetermined lag intervals Dn; and
a receiver, capable of correlating and multi-sampling received pulses by including a primary delay to reproduce said lag interval Dn and further including one or more secondary delays to produce one or more non-zero lag intervals dnk, wherein a plurality of second order statistical values of each of said received pulses produced at said primary and at said one or more secondary delays are matched to a plurality of second order statistical values of a predetermined reference pulse to determine an output signal indicative of encoded information. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An ultra-wideband (UWB) system, comprising:
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a transmitter capable of generating one or more chirp pulses separated by one or more predetermined lag intervals Dn, wherein said pulses are capable of being encoded by a relative polarity, a receiver, further comprising, a primary delay for delaying a received pulse by said transmitter to reproduce said lag interval Dn, one or more secondary delays to produce one or more non-zero lag intervals dnk of said received pulses, a plurality of pulse multipliers and pulse integrators designed to generate a plurality of autocorrelation functions of said received pulses at said primary delay and at said one or more secondary delays, a bank of filters to match a plurality of stored sampled autocorrelation functions of said transmitted pulses with said generated autocorrelation functions at said primary and said one or more secondary delays of said received pulses; and
a hard decision block designed to produce one or more output bits based on said matched sampled autocorrelation functions and said generated autocorrelation functions of said received pulses indicative of encoded information of said transmitted pulses.
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31. An ultra-wideband (UWB) method, comprising:
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estimating a plurality of values of a received signal'"'"'s second order statistics; and
matching said values to a transmitted signal'"'"'s sampled second order statistical values. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39)
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40. An ultra-wideband (UWB) method, comprising:
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transmitting one or more chirp pulses separated by one or more predetermined lag intervals Dn, wherein said pulses are capable of being encoded by a relative polarity, receiving said pulses, wherein a primary delay for a received pulse by said transmitter reproduces said lag interval Dn, and wherein one or more secondary delays produces one or more non-zero lag intervals dnk of said received pulses, multiplying and integrating said primary and secondary delayed pulses with a predetermined received reference pulse to generate a plurality of autocorrelation functions of said received pulses, matching a plurality of stored sampled autocorrelation functions of said transmitted pulses with said generated autocorrelation functions; and
outputting bit information based on said matched pre-sampled autocorrelation functions and said generated autocorrelation functions indicative of encoded information of said transmitted pulses. - View Dependent Claims (41, 42, 43, 44, 45, 46)
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Specification