Frequency deviation estimating method of receiver based on DTTB (Digital Television Terrestrial Broadcasting) standard
A technology of frequency offset estimation and coarse frequency offset estimation, which is applied to the shaping network, multi-frequency code system, and baseband system components in the transmitter/receiver. Problems such as partial precision estimation, to achieve good system requirements, high precision, and meet the effect of system requirements
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[0096] Assume that the TDS-OFDM signal data received by the receiving end is r(t), and the frame header mode of the data is the frame header mode 1 specified in the standard. Use a sampling frequency of f for the data s The ADC (analog-to-digital converter) samples it, and the sampling period is The sampled data can be expressed as
[0097] r(n)=r(nT s ) n=1 2...
[0098] If there is a frequency offset f at the receiving end o , then the frequency offset will cause a certain phase offset at each sampling point in is the initial phase of the first sample point, and the phases of each sample point are in a linear relationship. The specific method of this embodiment is described as follows:
[0099] 1. First, perform rough frequency offset estimation:
[0100] 11) Perform autocorrelation processing on the received data r(n). After the first symbol position of the received data, take 165 symbols, multiply and accumulate the 165 symbols delayed by 255 symbols; after th...
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