Long-term frequency stability requirements and optimal design of a code tracking delay-lock loop

A. L. Welti*, B. Z. Bobrovsky

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

Abstract

The classical theory of Kramers on the mean exit time of a Brownian particle in a potential well is applied to calculate the mean time to loss of lock in a code-tracking delay lock loop (DLL), yielding rather simple expressions and insight into the mechanism of loss of lock. The influence of the long-term frequency instability of the code clock and the channel noise on the code tracker is analyzed. Explicit expressions for the required long-term stability are presented. Performance analysis and optimal loop design are applied to an indoor cordless telephone in the 900-MHz band using code-division multiple-access (CDMA) direct-sequence spread spectrum.

Original languageEnglish
Pages551-555
Number of pages5
StatePublished - 1988
Externally publishedYes

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