Bootstrap Processor Channel Transfer Function Update
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Solution Overview
Problem
There is a need for an efficient and cost-effective technique to detect the bootstrap signal in OFDM-based radio communications systems, particularly in television systems like ATSC 3.0, where the bootstrap signal is robust but expensive in terms of physical resources due to its design for robustness and universality.
Innovation Solution
A receiver is designed with a radio frequency demodulation circuit and a bootstrap processor that detects and decodes the bootstrap OFDM symbols by generating an estimate of the channel transfer function, updating it for each symbol, and correlating with a signature sequence to accurately recover signalling data, thereby improving detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bootstrap signal is designed to be robust and universally detectable, then detection reliability is improved, but resource consumption increases
Solution Approach 1:
The patent applies preliminary action by performing channel transfer function estimation and updating before detecting signalling data in subsequent bootstrap OFDM symbols. The first bootstrap OFDM symbol is used to generate an initial channel transfer function estimate, which is then updated for each subsequent symbol before detection. This preliminary processing enables more efficient detection of signalling data encoded through cyclic shifts, reducing the resources needed while maintaining robust detection capability.
2Quantity of substance
If the bootstrap signal carries minimum information only, then resource efficiency is improved, but information completeness deteriorates
Solution Approach 1:
The patent applies parameter changes by utilizing cyclic shift parameters of the signature sequence to encode signalling data. Instead of transmitting additional bootstrap OFDM symbols, the system varies the cyclic shift parameter to convey information about payload data detection parameters. This approach maintains resource efficiency while information completeness is achieved through the updated channel transfer function that enables accurate detection of these parameter-encoded signals.
3Measurement precision
If channel transfer function is updated for each bootstrap OFDM symbol, then detection accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent applies feedback by using the detected signalling data from each bootstrap OFDM symbol to update the channel transfer function estimate for subsequent symbols. The process forms a feedback loop where detection results inform future estimation, improving accuracy iteratively. This feedback mechanism achieves high detection accuracy while managing processing complexity through the structured update procedure that leverages previous detection outcomes.
Data Source
AI summary
A receiver for detecting and recovering payload data from a received signal, the receiver comprising a radio frequency demodulation circuit configured to detect the received signal, the received signal carrying the payload data as Orthogonal Frequency Division Multiplexed, OFDM, symbols in one or more of a plurality of time divided frames, each frame including a preamble including a plurality of bootstrap OFDM symbols. One or more of the bootstrap OFDM symbols of the preamble carry signalling data represented as a relative cyclic shift of a signature sequence carried by the bootstrap OFDM symbols, the signalling data providing an indication of parameters for detecting and recovering the payload data carried by the one or more frames. The receiver comprises a detector circuit configured to detect and to convert a useful part of the one or more of the bootstrap OFDM symbols into the frequency domain and a bootstrap processor. The bootstrap processor is configured to generate, using the signature sequence, an estimate of a channel transfer function from a first bootstrap OFDM symbol, and to decode the signalling information carried by one or more other bootstrap OFDM symbols using the estimate of the channel transfer function and the signature sequence. A demodulator circuit is configured to recover the signalling data from the one or more bootstrap OFDM symbols using the estimate of the channel transfer function. The bootstrap processor is configured to generate, for each of the one or more other bootstrap OFDM symbols, an updated version of the channel transfer function, to equalize each of the one or more other bootstrap OFDM symbols using the updated version of the channel transfer function for each of the one or more other bootstrap OFDM symbols, and to detect the signalling data carried by the one or more other bootstrap OFDM symbols by correlating the equalized one or more other bootstrap OFDM symbols with a reproduced version of the signature sequence. Embodiments of the present technique provide an improvement in detecting and recovering signalling data carried by the bootstrap signals by updating the channel transfer function for each bootstrap OFDM symbols.