Method for integral multiplying frequency deviation correction of receiving terminal of WiMAX system base station
A base station, frequency domain technology, applied in multi-frequency code systems and other directions, can solve the problems of system design difficulty, reduced correlation of transmitted signals, and high algorithm complexity, so as to improve practicability and feasibility, reduce computational complexity, and save money. The effect of storage space
Active Publication Date: 2009-06-10
武汉烽合智达信息技术有限责任公司
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Among the various existing integer multiple frequency offset estimation algorithms, the range of frequency offset estimation for most algorithms is too narrow, generally within several integer multiples of the subcarrier spacing. See Yun Hee Kim, Iickho Song , Seokho Yoon, and So Ryoung Park "An Efficient Frequency Offset Estimator for OFDM Systems and Its PerformanceCharacteristics", the algorithm designed by it can estimate the frequency offset of integer multiples in the entire bandwidth, but the complexity of the algorithm is too high, It is difficult to design the system; at the same time, the algorithm uses the received signal to correlate with the known transmitted signal. Since the received signal has been affected by various noises and deviations, its correlation with the transmitted signal has been greatly reduced. , has a certain influence on the accuracy of the design
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[0019] It is assumed that the coarse synchronization of frames and symbols and the estimation and correction of fractional frequency offsets have been performed before the base station performs FFT transformation on the received signal, and the short preamble frequency domain sequence after FFT transformation only has integer multiples of subcarrier frequency deviations , that is to say, a cyclic offset occurs to the 256 samples of the received short preamble frequency domain sequence. The purpose of the integer multiple frequency offset estimation algorithm is to obtain the offset value of the sequence sample value in the frequency domain, and then perform integer multiple frequency offset correction.
[0020] According to the provisions of the IEEE 802.16-2004 protocol, we know the value of the short preamble frequency domain sequence sent by the SS from the previous analysis. By analyzing the frequency domain sequence of 256 samples, we find that the value of the sequence is...
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This invention relates to the frequency deviation estimation of integer times to the base station receiving end of a WiMAX system and a calibration method including the following steps: determining number of a sample value based on same accessed values of the received 256 sample values of the short front pilot domain sequence after FFT and computing the middle variables of the elements corresponding to said sample number, shifting in circulation two values of the 256 domain sequence values to select the corresponding elements to compute the middle variables according to said number, repeating said step to get other variables, comparing the values to find out the subscript value j of a middle variable corresponding to the maximum value and shift (j-1)x2 values to the received frequency domain sequence.
Description
technical field [0001] The invention relates to a carrier synchronization optimization method for a base station receiving end 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 the air interface between the base station BS (Base Station) and the s...
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IPC IPC(8): H04L27/26
Inventor 吴永东王讴
Owner 武汉烽合智达信息技术有限责任公司