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Method and apparatus for initial synchronization in time division duplex synchronous code division multiplex access system

A technology of synchronous code division multiple access and initial synchronization, which is applied in the transmission system, communication between multiple stations, electrical components, etc., can solve problems such as poor detection performance and performance loss, and achieve shortened initial synchronization time and low Achieving the effect of complexity

Active Publication Date: 2009-11-04
XUANPU INDUSTRY CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the above method only uses power information and does not use other information (such as phase information in the received signal), so its performance has a large loss compared with the optimal "maximum likelihood" detection algorithm
Especially when the signal-to-interference-noise ratio (SINR) is less than zero, that is, when the signal power is lower than the noise and interference power, its detection performance is not good

Method used

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  • Method and apparatus for initial synchronization in time division duplex synchronous code division multiplex access system
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  • Method and apparatus for initial synchronization in time division duplex synchronous code division multiplex access system

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Embodiment Construction

[0079] based on the following Figure 4 ~ Figure 9 , to illustrate the preferred embodiment of the present invention.

[0080] Such as Figure 4 As shown, the present invention provides a method for initial synchronization in a time division duplex synchronous code division multiple access system, comprising the following steps:

[0081] Step 1. The input digital signal sampling is firstly matched and filtered through the receiving filter, and the out-of-band noise and interference are filtered out.

[0082] The receive filter generally works in the "oversampling" mode, that is, the data rates of the input, output data streams, and internal data streams are all multiples of the chip rate. Assuming that Q times oversampling is adopted, the output of the receiving filter can be expressed as: {d 1 , d 2 ,...,d Q×i+1 , d Q×i+2 ,...,d Q×(i+1) ,...}, where the Q samples corresponding to the i-th chip are {d Q×i+1 , d Q×i+2 ,...,d Q×(i+1)}. Generally, the value of the over...

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Abstract

A path searching method of TD-SCDMA system includes steps of power calculation, power combination, feature value calculation, feature value combination and comparison. The path searching device of TD-SCDMA consists of power calculator, power combiner, feature value calculator, feature value combiner and comparator. The said method and said device can quickly search out position of DwPTS so as to shorten initial synchronization time of TD-SCDMA system effectively.

Description

technical field [0001] The present invention relates to a wireless communication system, in particular to a time division duplex synchronous code division multiple access (Time Division Synchronous Code-Division Multiple Access, referred to as TD-SCDMA) mobile communication system, applied to the initial cell Search (Initial Cell Search) synchronization method and device. Background technique [0002] In 1946, Bell Laboratories in the United States proposed to divide the service area of ​​mobile phones into several cells, and set up a base station in each cell to form a new concept of cellular (Cellular) mobile communication in a cellular system. The development of cellular mobile communication systems Experienced a process from analog network to digital network, from frequency division multiple access (FDMA) to time division multiple access (TDMA) and code division multiple access (CDMA). [0003] The most critical in the third generation mobile communication system is Rad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707H04B7/26H04B1/7073
Inventor 谢一宁刘栋冉晓龙
Owner XUANPU INDUSTRY CO LTD