Timed down going capturing and tracking method in CDMA system

A code division multiple access and timing adjustment technology, applied in the field of synchronization capture and tracking of receiving systems, can solve the problems of adjusting the timing estimation window, timing drift, insufficient timing tracking accuracy, etc., to ensure tracking performance, avoid timing drift, and ensure reception. The effect of machine performance

Active Publication Date: 2010-09-29
XUANPU INDUSTRY CO LTD
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AI Technical Summary

Problems solved by technology

[0003] The current timing tracking method has problems such as insufficient timing tracking accuracy, unable to adaptively adjust the position of the timing estimation window, so as to better resist the multi-path propagation environment, etc.
At the same time, it is prone to timing drift and other situations under low signal conditions

Method used

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  • Timed down going capturing and tracking method in CDMA system
  • Timed down going capturing and tracking method in CDMA system
  • Timed down going capturing and tracking method in CDMA system

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Embodiment Construction

[0024] Combine below Figure 1 to Figure 6 A specific embodiment of the present invention is described to further understand the content of the present invention.

[0025] The present invention provides a downlink synchronous acquisition and tracking system in the system under the condition of code division multiple access, which comprises the following steps:

[0026] Step 1. channel estimation, utilize training sequence to estimate the situation of the channel of receiving channel, and obtain the module p (k) of channel estimation;

[0027] Step 2. channel estimation average, using the cyclic shift method to obtain the channel estimation p (k) obtained in step 1, carry out averaging to obtain the channel estimation q (k) after the average;

[0028] Step 3. path search, carry out path search to the averaged channel estimate q(k) obtained in said step 2, and search out the information of the effective path exceeding the threshold;

[0029] Step 4. Signal quality detection, j...

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Abstract

The invention includes following steps: channel estimation, average of channel estimation, path search, signal quality detection, position detection of virtual first path, outputting timing adjustment command, and timing deviation compensation. Advantages are: (1) accurate capturing and tracking change of received timing, and adjusting timing of system accurately, and in time in order to guarantee performance of receiver; (2) under atrocious signal, the timing system can turn off timing operation in order to prevent timing drift; (3) in timing track procedure, the timing system output a compensation quantity for timing to compensate timing deviation for a slow tracking speed. Thus, the system keeps quality of received signal.

Description

technical field [0001] The present invention relates to a method for synchronous capture and tracking of a downlink receiving system of a Code Division Multiple Access (CDMA) communication system, and specifically relates to a method for capturing and tracking downlink reception synchronization of a TD-SCDMA system. Background technique [0002] In a code division multiple access system, each symbol has its precise system receiving timing. In order to ensure the performance of the system receiving, it is necessary to have an accurate receiving symbol timing. Due to the constant change of the channel and the distance between the communication terminal and the base station and the propagation environment, the receiving timing of the terminal will constantly change. Accurately obtaining the timing of the base station and tracking the change of the timing of the base station in a timely manner is to ensure that the system important factor in performance. A good timing tracking ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J13/00H04B1/7073
Inventor 王炳立李兴伟叶远谢一宁
Owner XUANPU INDUSTRY CO LTD
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