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Method for estimating and compensating sampling clock offset and receiving device

A sampling clock and offset estimation technology, applied in the field of communication, can solve the problems of inability to synchronize, unable to synchronize quickly, and system performance deterioration.

Active Publication Date: 2010-09-22
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

In addition, when there is a large sampling clock deviation in the system, this method cannot be synchronized quickly, and it takes a long time to compensate the sampling clock deviation to the allowable range of the system, even when there are some large deviations, Failed to sync, system performance severely degraded

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  • Method for estimating and compensating sampling clock offset and receiving device
  • Method for estimating and compensating sampling clock offset and receiving device
  • Method for estimating and compensating sampling clock offset and receiving device

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Embodiment Construction

[0043] In the following description, many technical details are proposed in order to enable readers to better understand the application. However, those skilled in the art can understand that without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.

[0044] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings.

[0045] The first embodiment of the present invention relates to a method for sampling clock offset estimation and compensation. This embodiment is applied in the China Mobile Multimedia Broadcasting (CMMB) system. In this embodiment, signal reception is divided into two phases: an acquisition phase and a tracking phase. When the system starts to ...

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Abstract

The invention relates to the field of communication, in particular to a method for estimating and compensating a sampling clock offset and a receiving device. In the invention, a sampling clock offset is estimated and comprehended by two steps. In the first step, the sampling clock offset is sampled according to two synchronous symbols in a time slot and compensated in the next time slot according to an estimating result; and in the second step, the sampling clock offset of every two adjacent data symbols in the time slot is finely estimated by utilizing the continuous pilot frequency symmetry of the data symbols and the sampling clock offset of the currently received data symbols is compensated according to a current estimating result after the sampling clock offset of every two adjacent data symbols is estimated every time. By the invention, the adjusting speed is greatly improved, and the system can rapidly enter a stable state.

Description

technical field [0001] The invention relates to the communication field, in particular to a sampling clock offset compensation technology in the communication field. Background technique [0002] In a China Mobile Multimedia Broadcasting ("CMMB" for short) system, the sampling clock accuracy of an Analog Digital Converter ("ADC" for short) has a great impact on system performance. When the sampling clock offset is very small, within 5ppm, the performance is less affected, but the existing terminals are facing the pressure of production costs, and the cost of high-precision crystal oscillators is correspondingly high. For low-precision crystal oscillators, it is often difficult to meet 5ppm accuracy requirement. [0003] At present, for low-precision crystal oscillators, the estimation and compensation of the sampling clock offset are mainly used to meet the system requirements. Specifically, the frame structure of the CMMB system is as follows: figure 1 As shown, the phys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 刘文明
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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