Receiver for use in an ultra-wideband communication system
First Claim
1. Apparatus for use in an ultra-wideband (UWB) communication system in which multi-symbol packets are transmitted via a transmission channel, each transmitted packet comprising a multi-symbol data payload, the apparatus comprising:
- an analog-to-digital converter (ADC) adapted to;
receive a conditioned form of a received packet;
periodically sample said packet at a selected oversampling rate; and
provide corresponding samples, each sample comprising a selected one of;
a sign bit having a first value indicative of said sample being positive, and a second value indicative of said sample being negative;
ora single trit having a first value indicative of said sample being positive, a second value indicative of said sample being substantially zero, and a third value indicative of said sample being negative;
ora sign bit and a magnitude bit;
said sign bit having a first value indicative of said sample being positive, and a second value indicative of said sample being negative; and
said magnitude bit having a first value indicative of said sample being substantially zero, and a second value indicative of said sample being substantially non-zero; and
a digital channel estimator adapted to receive a selected set of said corresponding samples, and to develop therefrom a best estimate of a channel impulse response (CIR) of said channel as a function of said selected set of said corresponding samples, said CIR estimate comprising a set of coefficients.
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Accused Products
Abstract
In an ultra-wideband (“UWB”) receiver, a received UWB signal is periodically digitized as a series of ternary samples. The samples are continuously correlated with a predetermined preamble sequence to develop a correlation value. When the value exceeds a predetermined threshold, indicating that the preamble sequence is being received, estimates of the channel impulse response (“CIR”) are developed. When a start-of-frame delimiter (“SFD”) is detected, the best CIR estimate is provided to a channel matched filter (“CMF”) substantially to filter channel-injected noise.
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Citations
12 Claims
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1. Apparatus for use in an ultra-wideband (UWB) communication system in which multi-symbol packets are transmitted via a transmission channel, each transmitted packet comprising a multi-symbol data payload, the apparatus comprising:
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an analog-to-digital converter (ADC) adapted to; receive a conditioned form of a received packet; periodically sample said packet at a selected oversampling rate; and provide corresponding samples, each sample comprising a selected one of; a sign bit having a first value indicative of said sample being positive, and a second value indicative of said sample being negative;
ora single trit having a first value indicative of said sample being positive, a second value indicative of said sample being substantially zero, and a third value indicative of said sample being negative;
ora sign bit and a magnitude bit; said sign bit having a first value indicative of said sample being positive, and a second value indicative of said sample being negative; and said magnitude bit having a first value indicative of said sample being substantially zero, and a second value indicative of said sample being substantially non-zero; and a digital channel estimator adapted to receive a selected set of said corresponding samples, and to develop therefrom a best estimate of a channel impulse response (CIR) of said channel as a function of said selected set of said corresponding samples, said CIR estimate comprising a set of coefficients. - View Dependent Claims (2, 3, 4)
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5. A receiver for use in an ultra-wideband (UWB) communication system in which multi-symbol packets are transmitted via a transmission channel, each transmitted packet comprising a multi-symbol data payload, the receiver comprising:
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an analog-to-digital converter (ADC) adapted to; receive a conditioned form of a received packet; periodically sample said packet at a selected oversampling rate; and provide corresponding samples, each sample comprising a selected one of; a sign bit having a first value indicative of said sample being positive, and a second value indicative of said sample being negative;
ora single trit having a first value indicative of said sample being positive, a second value indicative of said sample being substantially zero, and a third value indicative of said sample being negative;
ora sign bit and a magnitude bit; said sign bit having a first value indicative of said sample being positive, and a second value indicative of said sample being negative; and said magnitude bit having a first value indicative of said sample being substantially zero, and a second value indicative of said sample being substantially non-zero; and a digital channel estimator adapted to receive a selected set of said corresponding samples and to develop therefrom a best estimate of a channel impulse response (CIR) of said channel as a function of said selected set of corresponding samples, said CIR estimate comprising a set of coefficients. - View Dependent Claims (6, 7, 8)
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9. A method for operating an ultra-wideband (UWB) communication system in which multi-symbol packets are transmitted via a transmission channel, each transmitted packet comprising a multi-symbol data payload, the method comprising the steps of:
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analog-to-digital converting each transmitted packet by; receiving a conditioned form of a received packet; periodically sampling said packet at a selected oversampling rate; and providing corresponding samples, each sample comprising a selected one of; a sign bit having a first value indicative of said sample being positive, and a second value indicative of said sample being negative;
ora single trit having a first value indicative of said sample being positive, a second value indicative of said sample being substantially zero, and a third value indicative of said sample being negative;
ora sign bit and a magnitude bit; said sign bit having a first value indicative of said sample being positive, and a second value indicative of said sample being negative; and said magnitude bit having a first value indicative of said sample being substantially zero, and a second value indicative of said sample being substantially non-zero; and digitally channel estimating a selected set of said corresponding samples, and developing therefrom a best estimate of a channel impulse response (CIR) of said channel as a function of said selected set of said corresponding samples, said CIR estimate comprising a set of coefficients. - View Dependent Claims (10, 11, 12)
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Specification