Method of and apparatus for computation of unbiased power delay profile

Abstract

A method of determining a noise-corrected power delay profile includes determining a power delay profile and calculating a noise-corrected power delay profile. The step of calculating the noise-corrected power delay profile includes using a biased noise-floor power estimate, the power delay profile, and a noise-scaling factor.

Description

technical field [0001] The present invention relates to digital radio communication systems in which the delays of multipath components of a time-varying fading channel are to be estimated. The digital wireless communication system may include, for example, a system using Code Division Multiple Access (CDMA) RAKE receivers. In particular, the invention relates to improving the robustness of detection of new multipath components in a radio propagation channel and tracking of known paths by reliably indicating a suitable location for a path searcher window. Background technique [0002] In wireless communication, a physical channel is formed between a transmitter and a receiver through a radio link. In most cases, the antenna of the transmitter is not strictly aimed at the receiver. Besides the possible direct path, there are often many other propagation paths between the sender and receiver. These other propagation paths typically result from reflections from objects near ...

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However, this approach severely underestimates σ g 2

Since the noise floor is not fully removed, significant residual offset effects remain

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