OFDM frequency offset joint estimation method
A frequency offset and autocorrelator technology, applied in the field of communication, can solve the problems of integer multiple frequency offset, fine symbol synchronization, etc., and achieve the effect of reducing the overhead of hardware operation and delay time
Active Publication Date: 2012-07-04
浙江科睿微电子技术有限公司
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[0014] The present invention is proposed aiming at solving the problem of integer multiple frequency offset or symbol fine synchronization in the prior art. Therefore, the main purpose of the present invention is to provide a joint OFDM estimation method to solve at least one of the above problems
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[0035] The main principle of a joint OFDM frequency offset estimation method according to an embodiment of the present invention is that by performing parallel correlation on the baseband data sequence at the receiving end, the lengths are D short and D long The autocorrelation operation; detect the autocorrelation peak value of the small number of points and the autocorrelation peak value of the large number of points according to the set autocorrelation threshold threshold; calculate the initial value of the integer multiple frequency offset estimation according to the autocorrelation peak value of the small number of points, and calculate the decimal number according to the autocorrelation peak value of the large number of points The initial value of the multiple frequency offset estimation; the initial value of the integer multiple frequency offset estimation and the fractional multiple frequency offset estimation initial value are obtained through the frequency offset valu...
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The invention provides an OFDM frequency offset joint estimation method and belongs to the field of communication technology. The method comprises the steps of: setting correlation length of a samll autocorrelator and correlation length of a large autocorrelator in accordance with a received baseband data sequence; obtaining the peak value of the small autocorrelator and the peak value of the large autocorrelator by computing in accordance with the correlation length of the small autocorrelator and the correlation length of the large autocorrelator; estimating an integer multiple frequency offset initial value in accordance with the peak value of the small autocorrelator and estimating a decimal multiple frequency offset initial value in accordance with the peak value of the large autocorrelator; and obtaining a frequency offset estimation value in accordance with the integer multiple frequency offset initial value and the decimal multiple frequency offset initial value. The OFDM frequency offset joint estimation method can reduce expenditure of hardware operation and time delay brought by synchronous and respective estimation of the decimal multiple frequency offset initial value and the integer multiple frequency offset initial value by time frequency, lowers computational complexity of the synchronous algorithm of the frequency, and improves real-time performance of the frequency offset detection estimation.
Description
Technical field [0001] The present invention relates to the field of communication technology, and specifically to a decimal frequency offset and integer multiple for frequency synchronization in a broadband data packet burst transmission orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, referred to as OFDM) system. A joint estimation method for frequency offsets. Background technique [0002] OFDM technology has been widely used in current broadband wireless communication systems and digital broadcast communication systems due to its excellent multipath resistance and high spectrum utilization: such as wireless LAN standards WiFi (802.11a / g / n), WiMax (802.16d / e), LTE downlink, digital broadcasting systems DVB, CMMB, etc. all use OFDM technology. However, a major drawback of OFDM technology is that it is sensitive to frequency offset (also called frequency offset). Frequency offset will destroy the orthogonality between subcarriers, cau...
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IPC IPC(8): H04L27/26
Inventor 吴斌张振东周玉梅
Owner 浙江科睿微电子技术有限公司