Decimal carrier synchronization algorithm based on cyclic prefix
A cyclic prefix and carrier synchronization technology, applied in the direction of multi-frequency code system, etc., can solve the problems of insufficient accuracy of carrier synchronization technology and the inability to meet the development needs of modulation order, so as to improve technical efficiency and accuracy, and highlight the substantive Features, algorithm, precise and concise effect
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[0028] The carrier frequency offset is generated because the oscillation frequencies of the transmitting end and the receiving end do not match, which is represented as an accumulated phase in the time domain and as an overall offset of the subcarrier in the frequency domain. Since the OFDM system needs to ensure the orthogonality of its sub-carriers, it is very sensitive to frequency offset and has relatively high requirements for carrier synchronization. In the present invention, we divide the received signal into the carrier frequency offset part and the remaining part, therefore, suppose the kth time-domain sampling point of a certain OFDM received after complete synchronization is: r(k) =s(k)exp(j2πΔfkT s )+n(k)=s(k)exp(j2πΔfkT / N)+n(k), and some transformations can be obtained: r(k)=s(k)exp(j2πk(f I + f F ) / N)+n(k), analyzing from the digital domain, since k is an integer, so f I It has no effect on the time domain of the signal, and then it can be concluded that r(k)=...
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