Ultra-wideband communications system
First Claim
1. An ultra-wideband (UWB) radio communication system comprising:
- a transmitter for generating pairs of pulses separated by a time interval, D, wherein transmitted data is encoded by a relative polarity of two pulses of a pair of pulses; and
a receiver having a pulse-pair correlation, the pulse-pair correlation including a delay for delaying a received signal by a time interval, D, a signal multiplier for multiplying delayed and undelayed versions of the received signal, and a finite impulse response integrator for integrating a product signal output by the signal multiplier.
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Abstract
An ultra-wideband (UWB) communications system combines the techniques of a transmitted reference (TR) and a multiple access scheme called delay hopping (DH). Combining these two techniques using UWB signaling results in a penalty in signal-to-noise ratio (SNR) over conventional pulse position modulation (PPM) techniques but avoids the synchronization difficulties associated with conventional approaches. The signaling pulse waveforms are designed to insure that their power spectral densities, after any frequency translation to the center of an operating band, are essentially spectrally disjoint with frequencies that must be protected. This TR technique is combined with the DH multiple access technique to create a UWB communications scheme that has a greater multiple access capacity than does the UWB TR technique by itself.
173 Citations
34 Claims
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1. An ultra-wideband (UWB) radio communication system comprising:
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a transmitter for generating pairs of pulses separated by a time interval, D, wherein transmitted data is encoded by a relative polarity of two pulses of a pair of pulses; and
a receiver having a pulse-pair correlation, the pulse-pair correlation including a delay for delaying a received signal by a time interval, D, a signal multiplier for multiplying delayed and undelayed versions of the received signal, and a finite impulse response integrator for integrating a product signal output by the signal multiplier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of ultra-wideband (UWB) radio communication comprising the steps of:
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generating pairs of pulses separated by a time interval, D;
encoding data by a relative polarity of two pulses of a pair of pulses;
transmitting data encoded as pairs of pulses;
receiving encoded data; and
correlating the received encoded data by the steps of complex conjugate multiplying the received encoded data by the received encoded data delayed by the time interval, D, and integrating a signal produced by the complex conjugate multiplication. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification