Receiver for use in an ultra-wideband communication system
AssigneeDecaWave, Ltd.
InventorsMichael McLaughlin, Ciarân McElroy, Sinbad Wilmot, Brian Gaffney, Mici McCullagh
Life of this patent
Estimating the term…
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.
Claims24
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 synchronization header (SHR), 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 over-sample 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;
- or
- a 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;
- or
- a 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 estimator adapted to receive the samples comprising at least a portion of said SHR, and to develop therefrom a best estimate of a channel impulse response (CIR) of said channel.
An estimator 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 synchronization header (SHR), the estimator comprising:
- an analog-to-digital converter (ADC) adapted to:
- receive a conditioned form of a received packet;
- periodically sample said packet at a selected over-sample rate;
- and
- provide corresponding samples;
- a digital correlator adapted to:
- receive selected samples of each symbol of the SHR;
- periodically select at a selected up-sample rate a set of the selected samples;
- and
- develop from each of said sample sets a partial finite impulse response (FIR) of said channel to each symbol;
- a digital accumulator adapted to:
- receive each partial FIR developed by the correlator;
- accumulate the partial FIRs for at least a selected subset of all symbols comprising the SHR;
- and
- develop from the accumulated partial FIRs for said selected subset of said symbols a best estimate of a channel impulse response (CIR) comprising an impulse response of said channel.
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 synchronization header (SHR) and a multi-symbol data payload, the SHR comprising a preamble and a start-of-frame delimiter (SFD), the receiver comprising:
- an analog UWB front-end adapted to receive a transmitted packet and to provide a conditioned form of the received packet;
- an analog-to-digital converter (ADC) adapted to:
- receive the conditioned packet;
- periodically sample said packet at a selected over-sample rate;
- and
- provide corresponding samples;
- a digital polyphase correlator, each phase of which is adapted to:
- receive selected samples of each symbol of the SHR;
- periodically select at a selected up-sample rate a set of the selected samples;
- and
- develop from each of said sample sets a partial finite impulse response (FIR) of said channel to each symbol;
- a digital polyphase accumulator, each phase of which is adapted to:
- receive each partial FIR developed by a selected phase of the correlator;
- and
- accumulate the partial FIRs for at least a selected subset of all symbols comprising the SHR;
- and
- develop from the accumulated partial FIRs for said selected subset of said symbols a best estimate of a channel impulse response (CIR) of said channel.
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 synchronization header (SHR) and a multi-symbol data payload, the SHR comprising a preamble and a start-of-frame delimiter (SFD), the receiver comprising:
- an analog UWB front-end adapted to receive a transmitted packet and to provide a conditioned form of the received packet;
- an analog-to-digital converter (ADC) adapted to:
- receive the conditioned packet;
- periodically sample said packet at a selected over-sample rate;
- and
- provide corresponding samples;
- a digital correlator adapted to:
- receive selected samples of each symbol of the SHR;
- periodically select at a selected up-sample rate a set of the selected samples;
- and
- develop from each of said sample sets a partial finite impulse response (FIR) to each symbol;
- a digital accumulator adapted to:
- receive each partial FIR developed by the correlator;
- and
- accumulate the partial FIRs for all symbols comprising the SHR;
- and
- a digital windowing block adapted to:
- receive the accumulated partial FIRs for selected subsets of said symbols;
- and
- develop from the accumulated partial FIRs for all of said subsets a best estimate of a channel impulse response (CIR) of said channel;
- and
- a digital channel matched filter (CMF) adapted to:
- receive a selected portion of said best CIR estimate;
- receive selected samples of each symbol of said data payload;
- filter said received samples with the time reversed conjugate of said received selected portion of said best estimate of the CIR;
- and
- provide, for each symbol of said data payload, a filtered symbol by selectively combining the filtered samples of said symbol.
Dependencies are inferred from the claim text.