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Combined time synchronization method for receiving end of WiMAX system base station

A technology of timing synchronization and receiving end, which is applied in the field of communication and can solve problems affecting system performance and subcarrier orthogonality

Active Publication Date: 2006-07-26
武汉烽合智达信息技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once out of synchronization, the orthogonality between subcarriers will be affected, which seriously affects system performance
Therefore, the pros and cons of the synchronization algorithm will lead to the performance of the entire system

Method used

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  • Combined time synchronization method for receiving end of WiMAX system base station
  • Combined time synchronization method for receiving end of WiMAX system base station
  • Combined time synchronization method for receiving end of WiMAX system base station

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Embodiment Construction

[0024] The present invention proposes a joint synchronization method for frame, symbol timing and sampling timing at the receiving end of a WiMAX system base station, the basic principles of which are as follows:

[0025] Let the expression of the signal sent by SS be: X(t)e j(2πfct+) Where x(t) is the waveform of the SS transmitter after D / A conversion, f c is the sending carrier frequency,  is the carrier phase.

[0026] After passing through the transmission channel, the signals at each point at the receiving end of the base station can be expressed as:

[0027]

[0028]

[0029] in, Estimate frequency and phase estimates for the carrier. Δf c , Δ is the carrier frequency deviation and phase deviation, η(t) is the channel noise.

[0030] The data stream obtained after sampling is {r n},

[0031]

[0032] in, is the estimated value of the sampling interval,

[0033] Perform Fourier FFT transform, and {r n} into (1-2) for simplification, we get:

...

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Abstract

This invention relates to simultaneous method to receive locking simultaneous timing collection used in microwave to take global WiMAX system station receive end, which comprises the following steps: determining OFDM character initial point; timing the FFT changed front radio frequency zone sequence with known short radio zone sequence to get range angle sequence ok; through ok front and back sequence values; then taking even sequence by minus to get beta; then beta times -256 / 2ªð; controlling frame simultaneous and sample timing according to the results integral and partials.

Description

technical field [0001] The invention relates to a joint timing synchronization optimization method for frame and symbol fine synchronization and sampling timing synchronization of a base station of a WiMAX (Worldwide Interoperability for Microwave Access) system in the communication field. Background technique [0002] In recent years, when global mobile operators, equipment manufacturers, mobile phone manufacturers, and government departments of various countries have invested considerable funds and energy in the construction and operation of the third-generation mobile communication network (3G), the computer industry has launched A new broadband wireless access technology, named WiMAX. WiMAX is the abbreviation of Worldwide Interoperability for Microwave Access, generally translated into "microwave access global interoperability". [0003] WiMAX technology is based on IEEE's 802.16 series of standards. In the 802.16 series of standards, the technical requirements for th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 吴永东郭华志
Owner 武汉烽合智达信息技术有限责任公司