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Carrier detecting method for downlink signal of TD-SCDMA

A technology of TD-SCDMA and carrier detection, which is applied in transmission system, wireless communication, energy consumption reduction, etc. It can solve the problems of poor performance and achieve the effect of low algorithm complexity, good engineering application value and promotion and application prospect

Inactive Publication Date: 2008-10-22
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The traditional carrier detection method mentioned above does not perform very well when used in transmission channels with low SNR

Method used

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  • Carrier detecting method for downlink signal of TD-SCDMA
  • Carrier detecting method for downlink signal of TD-SCDMA
  • Carrier detecting method for downlink signal of TD-SCDMA

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Abstract

The invention provides a carrier wave testing method for a downgoing signal of a TD-SCDMA system. According to the characteristics that the signal power of a downgoing time slot in each signal frame is much larger than that of an up-bound time slot and a jumped frame structure of a power value is generated at the switching point between the downgoing time slot and the up-bound time slot in the TD-SCDMA system, firstly, the method performs the down conversion with different frequencies to a received high-frequency signal; secondly, the method utilizes a sliding window to intercept the down-conversion signal of different data sections to measure the power in order to count the power jumping times of the signal; finally, the method finishes the carrier wave detection of the downgoing signal according to the power jumping times. The method can guarantee the effectiveness and the precision of the carrier wave detecting method in the TD-SCDMA system and has low complexity of algorithm, thereby having good engineering application value and popularization prospect.

Description

Carrier detection method for downlink signal of TD-SCDMA system technical field The invention relates to a carrier detection method, more precisely, a method for detecting the carrier frequency point of a downlink signal of a TD-SCDMA system, and belongs to the technical field of wireless communication signal detection. Background technique In the mobile communication system, the terminal must detect the frame structure of the signal sent by the base station (refer to a frame structure specified in the TD-SCDMA standard shown in Figure 1), and this work is completed by the synchronization process. This synchronization covers frequency, codeword and broadcast channel synchronization. On the basis of good synchronous operation, the terminal can search for possible surrounding cells after power-on, log in and listen to the paging sent on the network. TD-SDMA (Time Division Synchronous Code Division Multiple Access) is one of the three mainstream standards of the third gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/34H04B17/00H04W24/08
CPCY02D30/70
Inventor 牛凯林家儒徐文波汪滢
Owner BEIJING UNIV OF POSTS & TELECOMM
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