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Frequency deviation estimation method and apparatus in mobile communication system

A mobile communication and frequency offset estimation technology, which is applied in the field of frequency offset estimation based on training sequences, can solve the problems of not being able to use frequency fine-tuning, reducing the accuracy of estimated frequency offset, etc.

Active Publication Date: 2005-12-21
RDA CHONGQING MICROELECTRONICS TECH CO LTD
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Problems solved by technology

Both of these points reduce the accuracy of the method for estimating the frequency offset, so it can only be used for the coarse frequency adjustment stage, not for the fine frequency adjustment

Method used

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  • Frequency deviation estimation method and apparatus in mobile communication system
  • Frequency deviation estimation method and apparatus in mobile communication system
  • Frequency deviation estimation method and apparatus in mobile communication system

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Embodiment Construction

[0054] The method and device of the present invention will be described in detail below through examples. The specific implementation steps in the TD-SCDMA system are as follows:

[0055] 1. Receive data

[0056] Receive the midamble data r of a certain time slot, and the length of r is 144chip.

[0057] 2. Estimate the original channel impulse response affected by frequency offset

[0058] Take out the continuous 128chip data r' in r, and calculate the original channel impulse response h affected by the frequency offset according to the following formula freq

[0059] h freq = ifft ( fft ( r ′ ) fft ( m ) ) ...

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Abstract

The invention includes steps: receiving a training sequence (midamble) data r in a time slot; carrying out channel estimation so as to obtain impulse response hfreq of channel influenced by frequency deviation; detecting component of midamble data transmitted; estimating impulse response h of channel not influenced by frequency deviation; estimating received midamble data r' not influenced by frequency deviation; carrying out estimation of frequency deviation through maximum likelihood method, and outputting estimated frequency deviation. Being adapted to system composed of multiple sub codes such as system of training sequence of TD - SCDMA, the invention possesses favorable antimultipath performance, simple and easy of implementation.

Description

technical field [0001] The invention belongs to the field of mobile communication, and in particular relates to a training sequence-based frequency offset estimation method and device for a TD-SCDMA system in a mobile communication system with good anti-multipath performance and high estimation accuracy. Background technique [0002] In mobile communication, there is often a large frequency deviation between the mobile device and the base station crystal oscillator when it is turned on. The mobile device must perform frequency compensation, and adjust the frequency deviation to an acceptable small range through a certain frequency adjustment process. Due to the frequency drift of the crystal oscillator, the mobile device must also perform frequency tracking to keep the frequency deviation within a small range. In the TD-SCDMA system, if the mobile device wants to demodulate the data correctly, it needs to make the frequency deviation less than 0.01ppm, that is, 200Hz. [0...

Claims

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Application Information

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IPC IPC(8): H04L27/00
Inventor 陈星袁圆
Owner RDA CHONGQING MICROELECTRONICS TECH CO LTD
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