Variable Training Patterns for Mobile TV Reception Bandwidth Allocation
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Solution Overview
Problem
Current ATSC digital television broadcast systems face challenges in providing reliable mobile reception, especially at vehicular speeds, due to difficulties in transmitting and receiving digital television signals effectively.
Innovation Solution
A wireless communication system that dynamically adjusts the bandwidth allocation for training information and audiovisual information using variable training patterns, allowing for reallocation of bandwidth based on reception conditions and technological advancements, enabling improved mobile reception by optimizing the use of training information in packetized data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed amount of training information is allocated in the ATSC standard, then the system maintains simplicity and ease of implementation, but the system cannot adapt to varying reception conditions and technological advancements, resulting in suboptimal mobile reception performance
Solution Approach 1:
The patent implements dynamic training information allocation by introducing multiple training patterns (first through sixth patterns) that can be selectively activated based on reception conditions. The system transitions from a static training information structure to a dynamic one where the amount and distribution of training information varies according to mobile reception needs, equalizer performance, and channel conditions, thereby resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The patent changes the parameter of training information quantity from a fixed value to a variable parameter. By defining different training patterns with varying amounts of training information (e.g., first pattern with more training info, sixth pattern with less), the system can adjust this parameter dynamically to optimize mobile reception while managing complexity through structured pattern selection.
2Reliability
If more training information is transmitted to improve mobile reception, then reception reliability improves, but bandwidth available for audiovisual information decreases
Solution Approach 1:
The patent creates a dynamic bandwidth allocation system where training information bandwidth is not fixed but adjusts based on reception conditions. During periods of poor mobile reception, more bandwidth is allocated to training information to improve equalizer performance. During periods of good reception, bandwidth is reduced and reallocated to audiovisual content, thus resolving the contradiction between reliability and quantity of transmitted information.
Solution Approach 2:
The patent applies partial action by transmitting only the necessary amount of training information required for adequate equalizer performance rather than continuously transmitting maximum training information. This allows the system to achieve sufficient reception reliability while minimizing bandwidth consumption, with the ability to increase training information only when needed based on reception conditions.
3Measurement precision
If training information is continuously transmitted at maximum level, then equalizer performance is optimized, but bandwidth efficiency decreases and audiovisual information transmission is reduced
Solution Approach 1:
The patent implements periodic training information transmission through structured training patterns that are activated based on periodic assessment of reception conditions. Rather than continuous maximum-level training information transmission, the system uses periodic updates with varying intensities (different training patterns) to maintain equalizer performance while optimizing bandwidth efficiency for audiovisual content transmission.
Solution Approach 2:
The patent uses partial action by providing just enough training information to achieve adequate equalizer performance rather than excessive continuous training. The six training patterns allow selective application of partial training information (e.g., sixth pattern with minimal training info for good conditions, first pattern with more training info for poor conditions), thereby maintaining measurement precision while improving productivity.
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.