Particle filtering ultra-wideband pulse timing tracker with feedback control

Abstract

By combining the digital phase-locked loop technique with the particle filtering technique, the invention provides a particle filtering ultra-wideband pulse timing tracker with feedback control. Timing deviation is modeled as a random walk by combing with a digital phase-locked loop, the parameters of the random walk are determined by using the Bayesian forecasting technique, and thus, a state space model of a digital filter is built. The period of a digital clock is finally controlled by using an output signal of the digital filter, so that the timing deviation capture range is enlarged, timing precision and timing stability are increased, and loss of lock does not occur at low signal to noise ratio. In addition, because the particle filtering algorithm is adopted, the tracker can work in the colored noise environment, and the scope of application is widened.

Description

technical field [0001] The invention relates to an ultra-wideband pulse timing tracker. Background technique [0002] In recent years, ultra-wideband communication systems that use narrow pulses to transmit information have become a research hotspot in future communication systems due to their high performance and high speed. Generally, the duration of the UWB pulse is less than 1 ns. It is difficult to sample such a short-duration signal in the prior art, and the error of timing tracking will greatly reduce the performance of the system. Therefore, the narrow pulse technology also brings new problems to the design of the receiver - the acquisition and tracking of the pulse timing are difficult. [0003] In UWB timing tracking, the literature [1] (Lovelace W.M., Townsend J.K., The effects of timing jitter and tracking on the performance of the impulse radio[J], IEEE JSAC, 2002, 20(9): 1646-1651) first The early-late gate tracking technology composed of matched filters is a...

AI Technical Summary

Problems solved by technology

[0008] (2) Sensitive to observation noise and poor timing accuracy;

[0009] (3) Unstable, easy to lose lock under low S / N ratio;

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