Method and system for estimating residual fractional frequency offset
A technology of frequency offset estimation and residual frequency offset, which is applied in multi-frequency code systems, baseband system components, shaping networks in transmitters/receivers, etc., can solve problems such as inability to correctly estimate residual frequency offsets, and achieve reduction Effects that affect, increase processing, and improve correctness and system stability
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Embodiment 1
[0048] The method for estimating residual fractional multiple frequency offset of the present invention includes the steps of residual frequency offset calculation, Doppler estimation and accumulation. The residual frequency offset calculation is in [f r -f d , f r +f d ] range, obtain the residual frequency offset estimates of the maximum and minimum boundaries, where f r is the residual fractional frequency offset, f d is the maximum Doppler frequency shift, and eliminates the distortion point and phase overflow point caused by the dynamic multipath channel by setting the frequency deviation threshold. Because once the estimated value of the residual frequency offset in the calculation of the residual frequency offset is obtained, if there is no greater Doppler frequency shift, the statistical boundary will not be updated, so the locked frequency offset will not change. Therefore, when the maximum Doppler shift becomes small, the estimator will fail in the subsequent pr...
Embodiment 2
[0063] Such as Figure 5 As shown, the system for estimating the residual fractional frequency offset of the present invention includes a frequency offset calculation unit, a Doppler estimation unit and an accumulation unit, which are respectively used for the residual frequency offset calculation, Doppler estimation and accumulation in Embodiment 1 operation. Where Dpilot and Dpilot_delay are analyzed scattered pilot data of adjacent odd (or even) OFDM symbols, and symbol_num is OFDM symbols. In the frequency offset calculation unit, there is a threshold decision device that receives the input of the scattered pilot modulus and the scattered pilot phase. The received discrete pilot data Dpilot and Dpilot_delay of adjacent odd (or even) OFDM symbols are first calculated by the Cordic (coordinate rotation digital calculation) module to calculate the modulus and phase angle, and store the obtained modulus and phase angle in in RAM. The modulus is used to eliminate the distort...
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