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Uplink synchronous tracking device and method

A synchronous tracking and synchronous control technology, applied in the field of communication, can solve problems such as high complexity, high cost, and difficulty, and achieve the effects of easy integration, reduced scale and complexity, and simple external interface

Inactive Publication Date: 2008-03-12
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The current uplink synchronization tracking technology used in TD-SCDMA system has the characteristics of channel estimation and joint detection algorithm by using intermediate codes to solve the interference caused by upli

Method used

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  • Uplink synchronous tracking device and method
  • Uplink synchronous tracking device and method

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Example

[0031] The first embodiment

[0032] Fig. 1 is a schematic diagram of the hardware device of the uplink synchronization tracking device according to this embodiment.

[0033]As shown in Figure 1, the uplink synchronization tracking device of the present invention includes: a double interpolation and power averaging unit 100, which is used to perform double linear interpolation on the effective channel impulse response of each user equipment, and calculate the value of each point. The power is averaged according to the antenna; the rough measurement unit 102, connected to the above-mentioned double interpolation and power averaging unit, is used to obtain the power threshold on the coarse side of the delay, and find the starting point and ending point that exceed the above threshold , And the peak point; the quadruple interpolation and fine measurement unit 104, connected to the rough measurement unit 102, is used to perform four times within the vicinity of the start point, end po...

Example

[0088] Second embodiment

[0089] Figure 2 is a schematic flow chart of the uplink synchronization tracking method according to this embodiment;

[0090] As shown in FIG. 2, the uplink synchronization tracking method of the present invention includes the following steps: First step S200, read the channel impulse response sequence corresponding to the first midamble of the user equipment in the time slot, and perform double interpolation , And average the power of the interpolated channel estimation value according to the number of antennas; the second step S202, according to the calculated noise threshold, filter out the noise, and obtain the start point, end point, and peak point of twice the sampling accuracy; In the third step S204, according to the above-mentioned starting point, ending point, and peak point of the rough measurement obtained in the above-mentioned second step S202, four-fold interpolation is performed in their vicinity to obtain the four-fold interpolation sta...

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Abstract

The present invention discloses an uplink synchronous tracking device, which comprises a duple interpolation and mean power unit to conduct duple linear interpolation for effective channel impact responses and calculate mean power of each point according to antenna, a loose measuring unit to acquire power threshold value in light of loose time delay measuring and find out a starting point, an end point and a peak value point exceeding the threshold value as above, a quadruple interpolation and fine measuring unit to fulfill quadruple interpolation nearby the starting point, the end point and the peak value point provided by the loose measuring unit to get each point after the quadruple interpolation, a synchronous control command creating unit to create synchronous control commands for the starting point, the end point and the peak value point provided by the quadruple interpolation and fine measuring unit after fine measuring, a synchronous command mapping and filling unit to map aforesaid synchronous control commands into corresponding downlink time slots and a master control unit to transfer and control links of all units above and process interface parameters.

Description

technical field [0001] The present invention relates to the field of communication, and more particularly relates to an uplink synchronization tracking device and method, which is especially suitable for TD-SCDMA (Time Division Synchronous Code Division Multiple Access) mobile communication system. Background technique [0002] Compared with other third-generation mobile communication technologies, TD-SCDMA (Time Division Synchronous Code Division Multiple Access) technology has an uplink synchronization technology as one of its technical characteristics. Uplink synchronization in TD-SCDMA requires that uplink signals from different user terminals at different distances can reach the base station synchronously. Since the mobile communication system works in an actual environment with severe interference, multipath propagation and Doppler effect, it is almost impossible to achieve ideal synchronization. However, synchronizing the arrival times of the main paths of each uplin...

Claims

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Application Information

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IPC IPC(8): H04B7/26H04B7/005H04B1/707H04L27/26H04J11/00H04B1/7073
CPCY02D30/70
Inventor 叶辉
Owner ZTE CORP
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