Method for implementing carrier frequency offset correction base on large-point FFT
A technology of carrier frequency offset and implementation method, which is applied in the field of signal processing, can solve the problems of consuming large hardware resources, etc., and achieve the effect of improving frequency resolution, improving operation efficiency, and increasing operation complexity
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[0030] figure 1 It is a flow chart of an implementation method for correcting carrier frequency offset based on large-point FFT.
[0031] In this example, if figure 1 Shown, the present invention a kind of realization method based on the FFT correction carrier frequency offset of large number of points, comprises the following steps:
[0032] S1. Perform quadrature mixing conversion on the received carrier signal
[0033] Taking the 16QAM signal as an example, let the received signal be f 0 is the frequency of r(n); without considering the influence of timing synchronization, inter-symbol interference and noise, r(n) is mixed with the quadrature local oscillator signal generated by the local voltage-controlled oscillator NCO, and then processed by low After the high-frequency components are filtered out by the pass filter, it is converted into two channels of I and Q, respectively:
[0034] I(n)=Acos[2πΔfnT s +θ 0 ]
[0035] Q(n)=Asin[2πΔfnT s +θ 0 ]
[0036] Among...
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[0066] In this embodiment, taking the 256QAM signal as an example, the carrier frequency deviation of the demodulated baseband signal received is Δf=40MHz, and the sampling rate is F s = 100MHz, the symbol rate is R s =5MSps, the number of FFT points is N=1M.
[0067] Synthesize the I and Q signals after quadrature mixing into a complex signal and do two matrix FFT analysis to obtain the spectrum characteristics.
[0068] Among them, the two matrix FFT steps are as follows:
[0069] 1) Arrange the sampled 1M points in row order to obtain a 1k×1k sampling point matrix, and then read them out in column order. This is mainly to operate on the RAM IP core, using two 512kRAMs to store 1M points. Write in row order and read out in column order.
[0070] 2) For the 1k×1k sampling point matrix, perform FFT of 1k points on each column of data read out to obtain a result matrix of 1M points, and store them in column order, and then read the result matrix of 1M points in row order o...
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