Analysis of Mean-Time to Lose Lock in a First- Order Digital DLL for NRZ and BOC Signals in the Presence of a Single-Tone Interferer

A. Robert Golshan, Stephan N. Lu, Ted H. Dang

Abstract:	"Loss of lock phenomenon in first-order code tracking loops has recently been analyzed for NRZ and BOC signals in [1] for analog, and in [2] for digital code tracking loops operating in the presence of broadband or additive white Gaussian noise. In this paper, the analysis of [2] is extended to the case of a single-tone interferer with random phase located at a fixed frequency offset relative to the signal of interest. It is shown that the output of the delay discriminator is well-approximated by a Gaussian random variable, in which case a closed-form pdf expression is obtainable. Mean-time to lose lock for NRZ(l) and BOC(ql,l) signals is then evaluated as a function of signal-to-interference ratio (SIR), loop bandwidth, early-late spacing, and tone frequency offset."
Published in:	Proceedings of the 61st Annual Meeting of The Institute of Navigation (2005) June 27 - 29, 2005 Royal Sonesta Hotel Cambridge, MA
Pages:	1163 - 1170
Cite this article:	Golshan, A. Robert, Lu, Stephan N., Dang, Ted H., "Analysis of Mean-Time to Lose Lock in a First- Order Digital DLL for NRZ and BOC Signals in the Presence of a Single-Tone Interferer," Proceedings of the 61st Annual Meeting of The Institute of Navigation (2005), Cambridge, MA, June 2005, pp. 1163-1170.
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