Decawave Limited

Qorvo Us, Inc.

Agere Systems Inc.

Ciaran McElroy

Michael McLaughlin

Jaroslaw Niewczas

Igor Dotlic

Sinbad Wilmot

Tony Proudfoot

Billy Verso

Marcas O'Duinn

Gavin Marrow

Dries Neirynck

Philip Curran

Alberto Molina Navarro

Brian Gaffney

Michael Joseph Mary Mccullagh

A phasor-based signal detector includes a signal processor to detect symbols in a received signal in the presence of an offset between the carrier frequency and an oscillator frequency of the signal processor. The signal processor calculates a phasor that indicates a phase difference between a first sample in a first symbol group and a second sample in a second symbol group. The first and second samples each include a real part and an imaginary part corresponding to a same sample position within the first and second symbol groups. Calculating the phasor includes a complex multiplication of one of the samples and a conjugate of the other one of the samples. A phase difference indicated by a phasor meeting a criteria may be used to estimate a carrier frequency offset (CFO). If the CFO is within a supported range, the signal processor may coherently accumulate symbols.

Phasor-based signal detector

In an ultra-wideband ('UWB') communication system, methods are disclosed for transmitting packets in multiple portions, each having a different pulse repetition frequency (“PRF”). Methods are also disclosed for transmitting packets discontinuously.

Ultra-wideband communication system

A method for use in a wireless communication system comprising a transmitter and a receiver, the method comprising receiving, in the receiver, data comprising a plurality of channel-distorted synchronization codes and plurality of channel-distorted cipher codes, generating a receiver cipher sequence, the receiver cipher sequence comprising a plurality of receiver cipher codes, analyzing the received data to identify correlations between the plurality of channel-distorted cipher codes in the received data and the plurality of receiver cipher codes, accumulating the identified correlations as accumulator data in an accumulator, identifying one or more peaks in the accumulator data, identifying a first correlation peak in the accumulator data that meets one or more criteria and using the first correlation peak to identify the first path of a data packet from the transmitter.

Secure ultra wide band ranging

A method for use in a wireless communication system comprising a transmitter and a receiver, the method comprising receiving, in the receiver, data comprising a plurality of channel-distorted synchronization codes and plurality of channel-distorted cipher codes, generating a receiver cipher sequence at the receiver, the receiver cipher sequence comprising a plurality of receiver cipher codes, analysing the received data to identify correlations between the plurality of channel-distorted cipher codes in the received data and the plurality of receiver cipher codes, accumulating the identified correlations as accumulator data in an accumulator, identifying one or more peaks in the accumulator data, identifying a first correlation peak in the accumulator data that meets one or more criteria and using the first correlation peak to identify the first path of a data packet from the transmitter.

In an ultra-wideband ('UWB') communication system, methods are disclosed for transmitting packets in multiple portions, each having a different pulse repetition frequency ('PRF'). Methods are also disclosed for transmitting packets dis-continuously.

In an ultra-wideband ('UWB') receiver, a received UWB signal is periodically digitized as a series of ternary samples. During a carrier acquisition mode of operation, 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 (&#x201c;SFD&#x201d;) is detected, the best CIR estimate is provided to a channel matched filter (&#x201c;CMF&#x201d;). During a data recovery mode of operation, the CMF filters channel-injected noise from the sample stream. Both carrier phase errors and data timing errors are continuously detected and corrected during both the carrier acquisition and data recovery modes of operation. The phase of the carrier can be determined by accumulating the correlator output before it is rotated by the carrier correction. By comparing the carrier phases of two receivers separated by a known distance, d, the angle of incidence, &#x3b8;, of the signal can be determined.

Measuring angle of incidence in an ultrawideband communication system

In an ultra-wideband ('UWB') communication system comprising a pair of UWB transceivers, methods for securely performing channel sounding. In a first GCP Sync method, a pre-determined set of Golay Complementary Pairs is added to an 802.15.4a frame. In a second CLASS method, a cyphered low auto-correlation sum set is added to frame. In a third LCSSS method, a low cross-correlation sidelobe sum set is added to the frame. In general, these methods are adapted to transmit a pseudo-randomly generated codeset which may have inherent sidelobe distortions, and then, in the receiver, to compensate for this, and any channel-induced, distortion by selectively modifing the cross-correlation codeset.

Secure channel sounding

In an ultra-wideband ('UWB') receiver, a received UWB signal is periodically digitized as a series of ternary samples. During a carrier acquisition mode, 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 (&#x201c;SFD&#x201d;) is detected, the best CIR estimate is provided to a channel matched filter (&#x201c;CMF&#x201d;). During a data recovery mode, the CMF filters channel-injected noise from the sample stream. Both carrier phase errors and data timing errors are continuously detected and corrected during both the carrier acquisition and data recovery modes of operation.

Timing recovery for use in an ultra-wideband communication system

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 (&#x201c;SFD&#x201d;) is detected, the best CIR estimate is provided to a channel matched filter (&#x201c;CMF&#x201d;) substantially to filter channel-injected noise.

Receiver for use in an ultra-wideband communication system

A FIR filter in a Gigabit transceiver in which data words are represented in three bits: SIGN representing word sign, SHIFT representing requirement for a shift operation, and ZERO indicating whether the word is zero. An AND gate ANDs an input coefficient and the ZERO bit, an XOR gate XORs the SIGN bit and the output of the AND gate, and a multiplier left-shifts the coefficient using the SHIFT bit and the output of the XOR gate. The circuit has a very low gate count.

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Dublin, Ireland

Ciaran McElroy