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Different base station signal first path time delay difference estimation method and apparatus in WCDMA system and its installation

A technology of delay difference and first path, which is applied in the direction of transmission system, selection device, code division multiplexing system, etc., can solve the problem that multipath signals no longer have waveform similarity, and achieve the effect of improving accuracy

Inactive Publication Date: 2004-12-22
HUAWEI TECH CO LTD
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Problems solved by technology

[0014] However, the disadvantage of this method is that the input signal is required to have waveform similarity. In practice, the signals transmitted by different base stations pass through different channels, resulting in multipath delay. Such multipath signals no longer have waveform similarity.

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  • Different base station signal first path time delay difference estimation method and apparatus in WCDMA system and its installation
  • Different base station signal first path time delay difference estimation method and apparatus in WCDMA system and its installation
  • Different base station signal first path time delay difference estimation method and apparatus in WCDMA system and its installation

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Embodiment Construction

[0027] figure 1 Shown is the execution process of a first path delay difference estimation method in the prior art. The search window signal is obtained through matched filtering and non-coherent accumulation, and the multipath signal is obtained through multipath decision, and then the first path delay is estimated , Directly subtract the first path delay of different base stations to obtain the first path delay difference.

[0028] Reference figure 2 In the illustrated implementation of the method of the present invention, firstly, matched filtering and non-coherent accumulation are performed on the base station signal received by the mobile station to obtain a search window, and then the first path judgment is performed on the search window to obtain the approximate time delay of the first path;

[0029] Then perform the first path interception on the search window signal to obtain the first path interception signal;

[0030] Cross-correlation of the first path intercepted s...

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Abstract

This invention discloses a method and its device for estimating different base station signal initial path time delay difference, first to get a search window signal by matched filtering and non-coherent accumulation, then through multipath judgement to get a rough place of the initial path and interrupt the initial path signal from the search window then again to detect cross-correlation and peak value of the initial path interruptive signal got by different base stations to get an initial path time delay difference between different base station signals, which effectively increases the accuracy of initial path time delay difference, so as to increase estimation accuracy to mobile station positions.

Description

Technical field [0001] The invention relates to a method and device for estimating the first path delay difference of signals of different base stations in WCDMA (Wideband Code Division Multiple Access Mobile Communication System). Background technique [0002] In the WCDMA system, if the OTDOA (Observed Time Difference Of Arrival) positioning method is used to locate the mobile station, it is necessary to first estimate the distance difference between different base stations and mobile stations, and the distance difference between different base stations and mobile stations It can be estimated by the difference in signal propagation delay. In the terrestrial wireless communication environment, due to the reflection, scattering, and diffraction of radio waves from buildings and the ground, the signal transmitted by the transmitter may propagate to the receiver through different paths, resulting in the so-called multiplication at the receiving end.径signal. Among them, the first pa...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707H04B7/26H04Q7/30
Inventor 吴疆郭房富叶环球
Owner HUAWEI TECH CO LTD