Uplink synchronization tracking method and device in TD-SCDMA system

Abstract

The present invention provides an uplink synchronous tracking method and a device in TD-SCDMA systems. The method can include steps below: I. Computing threshold values for effective diameter confirmation; II. Selecting effective diameters according to the threshold value; III. Interpolating threshold value to peak value phase position of the selected effective diameter to improve precision of the peak value phase position; IV. Computing energy matrix center of gravity for the effective diameter after being interpolated with the threshold value; V. Judging variation of synchronous sequence relation according to a relation between a position of the calculated energy matrix center of matrix and a target position arranged in outer synchronous control parameters and creating synchronous deviation commands. Therefore, the method and the device make uplink synchronous tracking more reliable, thus ensuring performance of receiving sets.

Description

technical field [0001] The present invention relates to the field of mobile communication, more specifically, to an uplink synchronization tracking method and device in a TD-SCDMA system. Background technique [0002] TD-SCDMA is a synchronous CDMA system, and the uplink signals sent by each user in the same time slot in the cell arrive at the base station at the same time. In this way, each code channel using the orthogonal spreading code can be completely orthogonal during despreading, without causing multiple access interference with each other, significantly reducing the interference between users in the cell, increasing the coverage of the cell, and improving the system capacity , which optimizes the link budget. At the initial stage of establishing a formal wireless link between the user terminal and the base station, uplink synchronization is established through a random access process. [0003] After the synchronization is established, since the position of each us...

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Problems solved by technology

[0006] In order to solve the disadvantages in the prior art that only use the information of the strongest path to judge whether the "synchronous timing relationship" has changed, it is easy to misjudgment, thus making the performance of the receiver unsatisfactory, the present invention provides an uplink in the TD-SCDMA system Synchronous tracking method and device, it calculates the energy moment for all effective multipaths, uses the energy moment to obtain the relative relationship between the center of gravity position of the energy moment and the target position set in the outer loop synchronization control parameters to determine whether the "synchronization timing relationship" is changed judge

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