Method and receiver for receiving an ultra wide band signal

Abstract

Areceiver (103) for receiving an Ultra Wide Band (UWB) signal comprises a receiver front end (105) coupled to symbol point correlators (107). The symbol point correlators (107) comprise a first plurality of correlators which generates correlated signal values around a first symbol decision point of a first symbol by correlating the received UWB signal with a local replica. The first plurality of correlators are time offset with respect to each other to generate first time offset correlated signal values. The time offsets are typically significantly less than the timing jitter of transmit and receive oscillators. The symbol point correlators (107) are coupled to a joint estimator (109) which determines a symbol value of the first symbol in response to the first time offset correlated signal values by joint detection of the symbol value and a time offset of the UWB signal. The invention may effectively reduce time jitter noise to a value determined by the relative time offset between the correlators.

Description

technical field [0001] The present invention relates to a method and receiver for receiving ultra-wideband (UWB) signals, more particularly but not exclusively, to a method for receiving pulse position modulation (PPM) UWB signals or pulse amplitude modulation (PAM) UWB signals method and receiver. Background technique [0002] In recent years, wireless data communication in home and business environments has become increasingly commonplace. A new wireless transmission technology called ultra-wideband (UWB) transmission has been proposed. UWB signals are generated by sending information in very short data pulses of typical 10-1000 picosecond duration, resulting in bandwidths of transmitted signals of several gigahertz. High data rates can be obtained through UWB signals, and because the bandwidth is very large, the spectral power density is relatively low. Consequently, the interference and susceptibility to narrowband interference from other signals in the frequency rang...

AI Technical Summary

Problems solved by technology

Although this time synchronization can compensate for some time jitter of the received signal or the local oscillator, the requirement for an accurate clock requires a very low synchronization bandwidth which cannot track most of the time jitter

Moreover, timing error detectors, such as lead-lag correlators, are in practice unable to produce sufficiently accurate timing error estimates for the extremely short-duration data pulses of UWB signals, so that only coarse compensation of time jitter is practical

Consequently, the design of current UWB communication systems is limited or complicated by oscillator accuracy and timing jitter, resulting in reduced performance and / or costly, complex and / or large numbers of oscillators and such communication units

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