DVB-T/H Receiver Phase Error Correction Using Channel State Information
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Solution Overview
Problem
In DVB-T/H receivers, conventional phase error correction methods are inefficient due to the need for separate delay buffers and phase accumulators, which increase memory requirements and complexity, especially in 8K mode operations, and do not effectively utilize channel state information for phase error estimation.
Innovation Solution
A phase error correction method that uses channel state information to rotate signals, eliminating the need for separate delay buffers and phase accumulators, and incorporates a phase corrector that estimates and corrects phase errors directly from FFT output signals, reducing memory requirements and simplifying the processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional CPE removal arrangement using delay buffer and phase accumulator is used, then phase error correction can be performed, but memory requirements and device complexity increase significantly
Solution Approach 1:
The patent extracts and eliminates the delay buffer component from the conventional CPE removal arrangement. Instead of storing entire OFDM symbols in a delay buffer, the invention directly uses the FFT output signals to estimate phase error, thereby removing the memory-intensive delay buffer while maintaining phase correction capability
Solution Approach 2:
The patent makes the channel estimation and equalization element perform dual functions: it both estimates channel state information and simultaneously estimates phase error for CPE correction. This multi-functionality eliminates the need for separate dedicated phase error estimation components, reducing overall device complexity
2Reliability
If conventional CPE removal arrangement with separate delay buffer and phase accumulator is used, then phase error correction can be performed, but processing complexity increases
Solution Approach 1:
The patent merges the phase error estimation function into the existing channel estimation and equalization element. By combining these functions, the invention eliminates separate processing stages for delay buffering and phase accumulation, simplifying the overall processing architecture while maintaining correction effectiveness
Solution Approach 2:
The patent performs phase error estimation directly from the FFT output signals before subsequent processing stages. This preliminary action allows phase information to be extracted and corrected early in the signal processing chain, eliminating the need for complex subsequent processing that would be required if phase correction were performed later
3Reliability
If conventional phase error correction method is used, then CPE can be removed, but channel state information is not effectively utilized
Solution Approach 1:
The patent uses channel state information estimated by the channel estimation and equalization element as feedback for phase error estimation. The CSI provides valuable information about the transmission channel conditions that is fed back into the phase correction process, improving the accuracy of CPE removal by accounting for channel-induced phase variations
Data Source
AI summary
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.