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A downlink synchronization method and device for time division multi-address system

A technology of time division multiple access and synchronous code, which is applied in the direction of time division multiplexing system, code division multiplexing system, communication between multiple stations, etc. It can solve the problem that the accuracy needs to be further improved and the amount of calculation is large and other problems, to achieve the effect of simple algorithm implementation, small amount of calculation, and improved recognition accuracy

Inactive Publication Date: 2008-02-20
UTSTARCOM TELECOM CO LTD
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AI Technical Summary

Problems solved by technology

This method can reduce the misjudgment rate of relevant calculation judgments to a certain extent, but the amount of calculation is large, and the accuracy needs to be further improved.

Method used

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  • A downlink synchronization method and device for time division multi-address system
  • A downlink synchronization method and device for time division multi-address system
  • A downlink synchronization method and device for time division multi-address system

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Embodiment Construction

[0028] The following all take the TD-SCDMA system as an example to describe the embodiment of the present invention, but this does not mean that the present invention is limited to this kind of communication system, on the contrary, the present invention can also be extended to other using pilot frequency slot or pilot frequency Code-synchronized time division multiple access systems, for example including but not limited to Winmax system and the like.

[0029] Specific embodiments of the present invention are described below with the aid of the drawings.

[0030] Figure 1 is a schematic diagram of a typical TD-SCDMA frame structure. As shown in Figure 1, a radio frame has a time interval of 10 milliseconds and consists of 2 subframes, each of which contains 6400 chips. A downlink pilot time slot is set in each subframe, which consists of a guard interval of 32 chips and a downlink synchronization code of 64 chips, and has a guard interval of 96 chips with time slot 1. The d...

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Abstract

The utility model relates to a downlink synchronization method for a time division multiple access system (TDMA system). According to the utility model, the downlink synchronization method comprises the following steps: receiving and processing data, calculating all chip power sum of the received data and carrying out relevant calculations of downlink synchronization codes to the received data, carrying out normalization processing to the chip power sum and relevant calculation results, judging the downlink synchronization codes, completing the other processes of downlink synchronization in cells. Compared with the prior art, the utility model has the advantages of simple process, less added calculated amount, capability of anti-interference from uplink power and other timeslot power, and higher accuracy of identification to downlink synchronization codes.

Description

technical field [0001] The invention relates to mobile communication technology, in particular to a downlink synchronization method and device for a time division multiple access system. Background technique [0002] Typical TDMA systems include Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems and Worldwide Interoperability for Microwave Access (Wimax) systems. Among them, the TD-SCDMA system has the advantages of asymmetric uplink and downlink, high spectrum utilization, and low transmission power. It is very suitable for applications with a large number of asymmetric data services and can provide high system capacity. [0003] In the TD-SCDMA system, when a user terminal accesses the network or a user uses a frequency scanner for testing, an initial cell search is required. Referring to the 3GPP TS 25.224 protocol, the initial cell search is divided into steps such as downlink synchronization (that is, downlink pilot time slot DwPTS search), calc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04J3/06H04J13/02
Inventor 许井泉邓单朱近康邱玲陈明
Owner UTSTARCOM TELECOM CO LTD
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