12RB waveform frequency estimation is inaccurate

[ChenCao2016]

symbol 0 data EVM: 4.5460775414204635%
symbol 1 data EVM: 3.5868168312898754%
symbol 2 data EVM: 1.9538764695602073%
symbol 3 data EVM: 0.19057517606488736%
symbol 4 data EVM: 1.727200892141332%
symbol 5 data EVM: 2.9323939803059638%
symbol 6 data EVM: 4.494065448554236%
symbol 7 data EVM: 4.8343168365048745%
symbol 8 data EVM: 5.357635390772133%
symbol 9 data EVM: 5.252260692667249%
symbol 10 data EVM: 5.979180886906116%
symbol 11 data EVM: 4.034757894496924%
symbol 12 data EVM: 3.915473999143628%
symbol 13 data EVM: 3.710913390806086%

[ChenCao2016]

Because the signal is sparse, the frequency estimation using only CP is not accurate. (unless you have very long capture)
Explore using data symbol in frequency domain to further estimate frequency error.