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US 8,559,490 B2Granted
Apparatus and method for removing common phase error in a DVB-T/H receiver
AssigneeThomson Licensing
InventorsPeng Liu, Jilin Zou, Li Zou
Life of this patent
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Abstract
A receiver is a Digital Video Broadcasting-Terrestrial/Handheld (DVB-T/H) receiver. The DVB-T/H receiver comprises a phase error corrector and a channel estimation and equalization element. The phase error corrector rotates a signal in accordance with an estimate of a phase error, e.g., CPE, which is determined as a function of channel state information (CSI) provided by the channel estimation and equalization element.
Claims16
A method for use in a receiver, the method comprising:
- receiving a signal, the signal representing an orthogonal frequency division multiplexed OFDM signal;
- and
- performing phase error correction on the signal as a function of channel state information (CSI) for providing a phase corrected signal, wherein the performing phase error correction step comprises:
- modifying pre-shifted continual pilots (CPs) as a function of the CSI to provide a pre-shifted CP-CSI sequence;
- cross-correlating fast fourier transform (FFT) output data representative of the signal with the pre-shifted CP-CSI sequence to provide cross-correlation results;
- determining a phase error from the cross-correlation results;
- and
- correcting a phase of the signal in accordance with the determined phase error.
5 more elements
An apparatus comprising;
- a processor operative on a first signal that is representative of a fast fourier transform (FFT) of a received orthogonal frequency division multiplexed (OFDM) signal for estimating a phase error as a function of channel state information (CSI) and for providing a phase corrected signal in accordance with the estimated phase error;
- and
- a memory for storing locations of pre-shifted continual pilots (CPs) in the first signal;
- wherein the processor (a) forms modified CPs corresponding to the stored locations in accordance with the CSI and (b) cross correlates the modified CPs with the first signal for estimating the phase error.
1 more element
An apparatus comprising:
- a fast fourier transform (FFT) for providing an FFT output signal comprising a number of samples;
- a spectrum shifter for reordering the samples in the FFT output signal to provide a spectrum shifted signal;
- and
- a phase corrector responsive to channel state information (CSI) for estimating a phase error from the FFT output signal and for correcting a phase of the spectrum shifted signal in accordance with the estimated phase error, wherein the phase corrector comprises:
- a memory for storing locations of pre-shifted continual pilots (CPs) in the FFT output signal;
- a memory for storing modified pre-shifted CPs, wherein the modified pre-shifted CPs are derived from the pre-shifted CPs and CSI;
- and
- a cross correlator for use in estimating the phase error, wherein the cross correlator cross correlates the modified pre-shifted CPs with the FFT output signal.
5 more elements
Dependencies are inferred from the claim text.