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Determination of the position of a pulse peak

A technology of peak position and pulse, applied in the field of cellular communication system, can solve problems such as large average error, achieve the effect of accurate estimation and improve accuracy

Inactive Publication Date: 2008-10-08
HMD GLOBAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after such a general compensation, there is still a large average error

Method used

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  • Determination of the position of a pulse peak
  • Determination of the position of a pulse peak
  • Determination of the position of a pulse peak

Examples

Experimental program
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Embodiment Construction

[0028] figure 1 is a flowchart illustrating a first embodiment of a method according to the present invention, which may be implemented in an exemplary CDMA system. A CDMA system includes a plurality of base stations of a cellular communication network and mobile stations that can communicate with these base stations over an air interface. This method is used at the mobile station to estimate the delay of signals received from some base stations in order to determine the current location of the mobile station.

[0029] figure 1 In the method shown, it is assumed that the pulse waveform of the impulse response after the received CDMA signal passes through the matched filter is triangular, so a triangular model is adopted. figure 2 Shown is a triangular model. Since the peak coverage in a CDMA system is 2 chips, triangle 21 is isosceles and its length is 2 chips.

[0030] figure 1 In the first step of the method shown, the mobile station samples the impulse response at a s...

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Abstract

The invention relates to a method for determining the position x>p< of a peak of a pulse in a signal received at a receiver. In order to improve the accuracy of this determination, the method comprises taking samples of said received signal, determining at least three samples, at least one of which has a signal strength exceeding a threshold value, and determining the position x>p< of the pulse peak based on an interpolation of at least two of the determined samples, which at least two samples are selected based on the signal strengths of the at least three determined samples, and which interpolation includes an evaluation of the signal strength of the at least two samples. The invention relates equally to a device and to a cellular communication system comprising means for realizing this method.

Description

technical field [0001] The invention relates to a method for determining the position of pulse peaks in a signal received by a receiver. The invention also relates to a device implementing the method and a cellular communication system. Background technique [0002] The pulse peak position of the received signal can be used, for example, to determine the delay of the signal as it propagates from the transmitting unit to the receiver. [0003] For example, the positioning service can evaluate the signal delay in the receiver in order to determine the current position of the receiver. In the case of line-of-sight transmission, the delay of the signal depends directly on the distance between the receiver and the respective transmitting unit. [0004] This type of positioning service can be exclusively provided by a satellite positioning system based on CDMA (Code Division Multiple Access) or a terrestrial cellular positioning system based on CDMA. In CDMA-based systems, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S1/04G01S1/00G01S5/00G01S5/02G01S19/24G01S19/30H04B1/707
CPCG01S5/0027G01S19/30H04B1/70755G01S19/24G01S5/0221H04B1/70757
Inventor 覃·正笛
Owner HMD GLOBAL