Variable Equalizer Training for Mobile ATSC Reception
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Solution Overview
Problem
Current ATSC digital television broadcast systems face challenges in mobile reception, particularly at vehicular speeds, due to difficulties in transmitting and receiving digital television signals effectively.
Innovation Solution
A system and method for wirelessly transmitting and receiving audiovisual information using a variable amount of training information, allowing dynamic bandwidth adjustment between training and payload information, utilizing orthogonal gold codes to identify training patterns and allocate bandwidth accordingly, enabling improved mobile reception by reallocating bandwidth from training to audiovisual information as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed amount of training information is transmitted in ATSC digital television broadcast, then the system maintains compatibility with existing standards, but the bandwidth allocation cannot be dynamically adjusted to optimize mobile reception conditions
Solution Approach 1:
The patent implements dynamic bandwidth allocation by allowing the training information duration to be variable rather than fixed. The system can adjust the amount of training information transmitted based on channel conditions, receiver mobility, and equalizer training requirements. This is achieved through a framework that supports different training patterns and dynamically selects appropriate training information durations to optimize mobile reception while maintaining standard compatibility
Solution Approach 2:
The patent changes the parameter of training information duration from a fixed value to a variable parameter. By allowing the training information duration to be adjusted based on reception conditions, the system can optimize bandwidth allocation between training and payload information. This parameter change enables adaptive modulation and coding schemes that respond to varying channel conditions without requiring complete system redesign
2Reliability
If more bandwidth is allocated to training information, then mobile reception quality improves, but the bandwidth available for audiovisual payload information decreases
Solution Approach 1:
The patent implements dynamic bandwidth allocation that adjusts the split between training information and payload information based on real-time conditions. When mobile reception quality is poor, more bandwidth is allocated to training information to ensure proper equalizer training. When conditions improve, bandwidth is reallocated to payload information to maximize content delivery. This dynamic adjustment resolves the contradiction by making the allocation flexible rather than fixed
Solution Approach 2:
The patent applies partial training information transmission by sending only the necessary amount of training data required for adequate equalizer training under current conditions. Rather than always transmitting maximum training information, the system transmits the minimum necessary amount, thereby freeing up bandwidth for payload information while still achieving acceptable reception quality
3Adaptability or versatility
If traditional ATSC 8-VSB modulation is used, then backward compatibility is maintained, but mobile reception at vehicular speeds becomes difficult or impossible
Solution Approach 1:
The patent introduces dynamic equalizer training that adapts to receiver mobility conditions. The system continuously adjusts training parameters based on detected channel conditions and receiver motion, enabling stable reception at vehicular speeds. This dynamic adaptation transforms the static ATSC 8-VSB system into one that can handle mobile conditions through real-time parameter adjustment
Solution Approach 2:
The patent implements preliminary equalizer training using transmitted training information before actual payload reception begins. This preliminary action prepares the equalizer for the specific channel conditions, ensuring that when payload information arrives, the receiver is already optimized for those conditions. This pre-training mechanism is crucial for maintaining reception stability during mobile reception
Data Source
AI summary
A system and method for wirelessly transmitting audiovisual information. Training information may be stored in a memory. A plurality of packets may be generated, including the training information. The plurality of packets may also include audiovisual information. The plurality of packets may include first information identifying a first training pattern of a plurality of possible training patterns. The first training pattern may specify one or more locations of the training information in the plurality of packets. The first information may be usable by a receiver to determine the first training pattern of the plurality of possible training patterns. The plurality of packets may be transmitted in a wireless manner.