US10615833B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10615833-B2 |
| Application number | US-201716340162-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 23, 2017 |
| Priority date | Nov 24, 2016 |
| Publication date | Apr 7, 2020 |
| Grant date | Apr 7, 2020 |
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A method for correcting RDS demodulation in a vehicle radio system including a digital core with an RDS demodulation block, a numerically controlled oscillator, a digital mixer that mixes the input signals with the output of the numerically controlled oscillator, a low-pass filter for recovering baseband RDS signals including a sequence of symbols, and a phase-estimating block configured to estimate a phase deviation of the baseband signal. The method including a first correction acting, depending on the estimation of the phase deviation of the baseband signal, on a phase equalizer, downstream of the low-pass filter, in order to cancel out the phase deviation, and optionally a second correction forming a feedback loop and acting on the numerically controlled oscillator depending on the drift in the phase deviations of the baseband signal.
Opening claim text (preview).
The invention claimed is: 1. A method for correcting RDS demodulation in a vehicle radio system, the method comprising: receiving, by an input for digital signals of a radio data system (RDS) demodulation block, RDS signals; mixing, by a complex digital mixer, the RDS signals with a complex value output by a numerically controlled oscillator to produce mixed RDS signals; filtering, by a low-pass filter, the mixed RDS signals to recover baseband demodulated RDS signals; estimating, by a phase-estimating block, a phase deviation of the baseband demodulated RDS signals based on a plurality of time delayed symbols in the baseband demodulated RDS signals; correcting, by an error loop filter, the complex value output by the numerically controlled oscillator depending on the estimation of the phase deviation of the baseband demodulated RDS signals; and decoding, by a decoding block, the baseband demodulated RDS signals. 2. The method as claimed in claim 1 , wherein the phase-estimating block performs a calculation of the phase deviation on N last received symbols, N being an integer comprised between 4 and 16. 3. The method as claimed in claim 2 , wherein the calculation of the phase deviation between a frequency of the numerically controlled oscillator and a frequency of an emitter is estimated using the following formula: θ ^ = 1 2 arg ( ∑ k = 0 N - 1 ( S ( k ) ) 2 ) = 1 2 arctan ( ∑ k = 0 N - 1 ( S ( k ) ) 2 ) . 4. The method as claimed in claim 2 , wherein a conjugate e −j{circumflex over (θ)} of the estimated phase deviation is calculated, which is injected into a phase equalizer, where it cancels out the phase deviation of the symbol transmitted to the decoding block, the conjugate e −j{circumflex over (θ)} of the phase deviation estimated being calculated using the following formula: e - j θ ^ = conj ( ∑ k = 0 N - 1 ( S ( k ) ) 2 ∑ k = 0 N - 1 ( ( Sk ) ) 2 ) . 5. The method as claimed in claim 1 , wherein the method comprises a second correction forming a feedback loop and acting on the numerically controlled oscillator depending on a drift in the phase deviations of the baseband signal, in order to reset a frequency of the numerically controlled oscillator to as close as possib
specially adapted for use in vehicles (H04B1/3827 takes precedence) · CPC title
Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop · CPC title
Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving · CPC title
for in-vehicle communication · CPC title
Digital filtering (H04B1/0035 takes precedence; digital filters per se H03H17/00) · CPC title
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