Combined time synchronization method for receiving end of WiMAX system base station
A timing synchronization and receiving end technology, applied in the field of communication, can solve the problems of the orthogonality of sub-carriers and system performance.
Active Publication Date: 2009-12-30
武汉烽合智达信息技术有限责任公司
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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
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[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: Where x(t) is the waveform of the SS transmitter after D / A conversion, f c For the transmit 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 , For 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:
[0034] ...
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The present invention relates to a method of combined timing synchronization of frame timing fine synchronization and sample timing synchronization used for a receiving terminal of a base station of a Worldwide Interoperability for Microwave Access (WiMAX) system, which comprises steps: an initial point of an OFDM symbol is determined; conjugate multiplication can be performed between a short leading frequency domain sequence after the Fast Fourier Transform (FFT) and a known short leading frequency domain sequence, and then an amplitude sequence alpha <k> can be obtained by taking amplitude; by performing subtraction between front and rear sequence values of alpha <k>, * which is figured out by averaging all the subtracted sequences can be multiplied by-256 / 2 pi, and the frame timing synchronization and the sample timing synchronization can be controlled according to the integral part and the fractional part of an obtained result. By using the method of the present invention, influences brought by phase excursion of carrier frequencies, corrected carrier frequencies, residual errors of sampling frequencies, random noise, etc. to the frame timing synchronization and the sample timing synchronization can be reduced effectively; at the time of improving the precision of the synchronous timing, speed of finishing synchronous timing of the WiMAX system can be accelerated, and system time delay caused by the synchronous timing can be shortened. 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 / 2pi; 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...
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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