Broadcast Signal Receiver Data Pipe Multiplexing
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Solution Overview
Problem
Current digital broadcast systems face challenges in data transmission efficiency, robustness, and network flexibility, especially when handling large amounts of data and mobile reception equipment, as they struggle to provide high-definition images and multiple audio channels effectively.
Innovation Solution
The development of a broadcast signal receiver that employs Orthogonal Frequency Division Multiplexing (OFDM) demodulation, pilot signal detection, and a frame parsing module to process and multiplex data, allowing for efficient transmission and reception of multiple services through the same RF signal bandwidth, while reducing the number of carriers and using pilot signals to enhance data transmission efficiency and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If digital broadcast systems transmit large amounts of video/audio data and additional services, then service functionality is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The patent segments data into multiple data pipes, each carrying specific service components. This allows efficient multiplexing of different service types (video, audio, data services) over the same physical channel, improving both service functionality and transmission efficiency through structured data organization and parallel transmission paths.
2Quantity of substance
If the number of carriers is increased to improve data transmission capacity, then bandwidth utilization is improved, but system complexity and susceptibility to interference increase
Solution Approach 1:
The patent dynamically adjusts the number of active carriers based on service requirements and channel conditions. By using OFDM technology, it can efficiently allocate carriers in the frequency domain, activating only the necessary number of carriers for each service, thereby maintaining data transmission capacity while reducing system complexity and interference susceptibility compared to always using maximum carriers.
3Reliability
If pilot signals are added to every symbol to improve channel estimation accuracy, then reception robustness is improved, but signal overhead and transmission efficiency deteriorate
Solution Approach 1:
The patent implements different pilot signal densities for different service types and channel conditions. Critical services or services in challenging reception environments receive higher pilot density for improved robustness, while less critical services in good conditions use lower pilot density to maintain transmission efficiency. This localized quality adjustment optimizes the balance between reliability and productivity.
4Adaptability or versatility
If multiple services are multiplexed in the time domain over the same RF bandwidth, then network flexibility is improved, but service isolation and quality of service control deteriorate
Solution Approach 1:
The patent transitions from purely time-domain multiplexing to multi-dimensional multiplexing by introducing data pipes as an additional dimension. Services are organized into separate data pipes that can be independently managed, allocated, and protected. This pipe-based structure provides service isolation and QoS control while maintaining the flexibility of time-domain multiplexing, as pipes can be dynamically assigned to different time slots and frequency resources.
Data Source
AI summary
A broadcast signal receiver includes a tuner for tuning a broadcast signal, a reference signal detector for detecting pilots from the tuned broadcast signal, a de-framer for de-framing a signal frame of the broadcast signal and deriving service data based on a number of carriers of the signal frame, and a decoder for performing error correction process on the derived service data.