Method for assessing integer frequency offset of TD-LTE system

A technique for estimating frequency offset by fractional multiples, applied in transmission systems, multi-frequency code systems, electrical components, etc., can solve problems such as performance degradation, inability to correctly estimate integer multiple frequency offsets, poor performance, etc.

Active Publication Date: 2012-09-26
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the performance of this algorithm is severely degraded when the timing deviation is large.
The existence of timing deviation causes the phase rotation of the frequency domain data, which reduces the correlation of the training sequence, the peak misjudgment occurs, and the integer multiple frequency deviation cannot be correctly estimated.
Some literature proposes to use the differential cor

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  • Method for assessing integer frequency offset of TD-LTE system
  • Method for assessing integer frequency offset of TD-LTE system
  • Method for assessing integer frequency offset of TD-LTE system

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Embodiment Construction

[0024] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] The present invention proposes a method for LTE system to estimate integer multiple frequency offset by detecting frequency-domain signal power, using differential autocorrelation between front and rear PSS in a wireless frame to estimate the position of coarse timing synchronization, and the algorithm is not affected by frequency offset influence, which is better than the conventional cross-correlation algorithm; the ML algorithm based on CP is used to estimate the timing fine synchronization position and fractional frequency offset near the timing coarse synchronization position, so that the subsequent FFT demodulation window falls into the CP to ensure a complete OFDM symbols; within the demodulation window, the baseband signal after fractional frequency offset correction is transformed into the frequency domain by FFT, and in view of ...

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Abstract

The invention discloses a method for assessing an integer frequency offset of a TD-LTE (Long Term Evolution) system. According to the invention, the method comprises the following steps: assessing a timing fine synchropoint and a decimal frequency offset near a coarse synchronous position; performing decimal frequency offset compensation to time-domain signal; confirming an FFT (Fast Fourier Transform) initial window according to the timing fine synchropoint; filtering subcarrier outside a center band frequency of the frequency-domain signal by a filter after switching to the frequency domain; retaining the PSS frequency domain signal; and accessing the integer frequency offset according to the position where the maximal subcarrier data energy is positioned. The method provided by the invention can be effectively resistant to larger timing error, and has the advantages of more accurate calculating and lower calculation complexity.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a method for estimating integer frequency offset in the third generation mobile communication long-term evolution system (hereinafter referred to as TD-LTE). Background technique [0002] In order to meet the challenges of emerging broadband access technologies such as WiMAX (Worldwide Interoperability for Microwave Access, WiMAX) and meet the needs of new services, 3GPP (3 rd Generation Partnership Project) launched the Long Term Evolution (LTE, Long Term Evolution) of air technology in March 2005, aiming to increase the data transmission rate, reduce the system delay, and increase the system capacity. [0003] The core technology of the LTE standard downlink is OFDM (Orthogonal Frequency Division Multiplexing) technology, which has the advantages of high spectral efficiency, high peak rate, and good resistance to inter-channel interference, frequency selec...

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Application Information

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IPC IPC(8): H04L27/26H04B1/7077
Inventor 陈发堂滕旺李小文王丹王华华刘宇
Owner CHONGQING UNIV OF POSTS & TELECOMM
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