Method for determining first path precisively in CDMA mobile communiation system

Abstract

The invention relates to an accurate first-path judgment method in a CDMA mobile communication system. Including a, calculating the noise threshold in the first path judgment; b, performing sidelobe suppression processing, judging whether there is a point exceeding the noise threshold in the multipath power delay profile, if so, outputting the candidate first path after sidelobe suppression processing path to the head path ambiguity determination and correction module, otherwise set the head path does not exist flag, and exit the entire head path judgment process; c, judge whether it is the head path ambiguity, if so, continue the correction process of the head path ambiguity, and get the correction and exit the entire first path judgment process; otherwise, output the candidate first path input in step b to the quadratic curve interpolation module; d, complete the calculation of the final first path position, and output the final first path position. The invention can automatically identify and eliminate side lobes, can automatically determine whether the first path is blurred, and can accurately correct the first path when the first path is blurred.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to an accurate first-path judgment method for mobile station positioning in a CDMA mobile communication system. technical background [0002] The first-path judgment is the prerequisite for realizing the positioning of the mobile station based on the cellular mobile communication system, and the accuracy of the first-path judgment directly determines the positioning accuracy of the mobile station. For example: OTDOA-IPDL (Observation Time Difference-Downlink Idle Period) positioning method based on WCDMA (Wideband Code Division Multiple Access) system requires UE (mobile station) or base station to perform some wireless signal measurements. These measurements include: UE side SFN-SFN OTDOA (Observation Time Difference) Type 2 measurement, UE Rx-Tx (Mobile Station Receive-Transmit Time Difference) Type 2 measurement, and RTT (Round Trip Time) measurement on the base station side. ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to propose a precise first-path judgment method in a CDMA mobile communication system. By adopting sidelobe suppression strategy, first-path fuzzy judgment and correction strategy, and quadratic curve interpolation strategy, it can overcome the inability of common first-path judgment method. The three major problems are sidelobe, blurred head path, and limited head path resolution.

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