Receiver for use in an ultra-wideband communication system

摘要

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.

主权项

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 preamble, the apparatus comprising:
a preamble detector adapted to develop:
a first CIR estimate over a sliding window comprising a first predetermined number of a first set of most-recently-received preamble symbols; anda second CIR estimate over a sliding window comprising a second predetermined number of a second set of most-recently-received preamble symbols, the second set being consecutive to the first set; and a CIR estimate store adapted selectively to store a CIR estimate; and a correlator adapted to:
store the first CIR estimate in the CIR estimate store;compute the scalar product of the second CIR estimate with the conjugate of the stored first CIR estimate; andif the resultant scalar product determines that the second CIR estimate insufficiently resembles the stored first CIR estimate, store the second CIR estimate in the CIR estimate store;otherwise, provide a preamble detect signal.