Decawave Limited

Imec

Dries Neirynck

Michael McLaughlin

Ciaran McElroy

Jaroslaw Niewczas

Igor Dotlic

Mladen Berekovic

Marcas O'Duinn

Li Huang

Olivier Rousseaux

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

The invention relates to methods for synchronizing a device to a signal containing a train of pulses representing a programmable number of repetitions of a predetermined code. Pulse position and code phase are searched for. In a first aspect, a programmable number of samples is taken per pulse frame in function of the available number of repetitions of said predetermined code. In a second aspect, the method comprises a signal detection stage from which, after performing a confirmation stage, information can be kept for a subsequent stage. In a third aspect, only a limited number of rotated versions of the predetermined code are checked, using a presumed code phase which is kept from a preceding stage.

Methods for fast and low-power UWB IR baseband receiver synchronization

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Dublin, Ireland

Dries Neirynck