Abstract
This paper considers an asynchronous direct-sequence code division multiple access (DS-CDMA) communication system over an AWGN channel. We are interested in estimating the propagation delay from the different users to the receiver. The Cramér-Rao bound for such an estimator is derived and compared with the measured variance of three algorithms.
The performance of the classical correlation-based estimator is demonstrated to be quite good in a noise-limited scenario. However, in a near-far situation, i.e., when the multiple access interference becomes dominant, the performance of the classical method is severely degraded.
We therefore propose two new algorithms which are shown to be near-far resistant.
This work was supported in part by the Swedish National Board for Industrial and Technical Development and by Motorola Inc., Plantation, FL.
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© 1994 Springer-Verlag Berlin Heidelberg
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Ström, E.G., Parkvall, S., Ottersten, B.E. (1994). Near-far resistant propagation delay estimators for asynchronous direct-sequence code division multiple access systems. In: Günther, C.G. (eds) Mobile Communications Advanced Systems and Components. IZS 1994. Lecture Notes in Computer Science, vol 783. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-57856-0_24
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DOI: https://doi.org/10.1007/3-540-57856-0_24
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