Broadcast Signal Time Deinterleaving With Virtual FEC Blocks
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Solution Overview
Problem
Current digital broadcast systems face challenges in data transmission efficiency, robustness, and network flexibility, particularly in handling large amounts of data and ensuring reliable mobile reception.
Innovation Solution
The method involves receiving broadcast signals using an OFDM scheme, parsing signal frames, and employing time deinterleaving with virtual FEC blocks to process data according to service characteristics, enabling efficient transmission and reception of multiple services through the same RF signal bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple broadcast services are transmitted through the same RF signal bandwidth, then transmission flexibility and data transmission efficiency are improved, but system complexity and difficulty of managing service-specific parameters increase
Solution Approach 1:
The patent segments broadcast services into multiple logical channels, each carrying service-specific data streams. This segmentation allows independent management of different services (e.g., video, audio, data services) within the same RF bandwidth, resolving the contradiction by organizing complexity through structured division while maintaining efficient spectral utilization.
Solution Approach 2:
The patent implements dynamic resource allocation where transmission parameters (modulation schemes, coding rates, bandwidth allocation) are adaptively adjusted for each logical channel based on service requirements and channel conditions. This dynamic approach enables flexible management of multiple services with varying QoS demands without requiring static, overly complex system design.
2Reliability
If virtual FEC blocks are inserted into TI blocks with variable numbers of FEC blocks, then robustness of broadcast signal transmission is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent applies preliminary Forward Error Correction (FEC) encoding to data blocks before time interleaving and transmission. By pre-encoding data with virtual FEC blocks, the system prepares error correction capability in advance, ensuring robustness against channel impairments without requiring complex real-time processing during reception. The preliminary action simplifies the receiver complexity while maintaining high reliability.
3Reliability
If time deinterleving is applied to service data in each physical path, then data transmission reliability is improved, but transmission delay and processing time increase
Solution Approach 1:
The patent applies time deinterleving selectively to critical service data paths where reliability requirements are highest, rather than uniformly to all data streams. This partial application approach achieves sufficient error protection for essential services while minimizing unnecessary processing delays for less critical data, thereby balancing reliability improvement with time loss reduction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances data transmission efficiency, improves robustness, and allows for flexible broadcast signal transmission and reception, including mobile and indoor environments, by controlling Quality of Service (QoS) for each service component.
Implementation Method 1
demodulating the received broadcast signals by an OFDM (Orthogonal Frequency Division Multiplex) scheme
Data Source
AI summary
A method and an apparatus for receiving broadcast signals thereof are disclosed. The apparatus for receiving broadcast signals, the apparatus comprises a receiver to receive the broadcast signals, a demodulator to demodulate the received broadcast signals by an OFDM (Orthogonal Frequency Division Multiplex) scheme, a frame parser to parse a signal frame from the demodulated broadcast signals, wherein the signal frame includes service data corresponding to each of a plurality of physical paths, a time deinterleaver to time deinterleave service data in each physical path by a TI (Time Interleaving) block, wherein the time deinterleaver further performs inserting at least one virtual FEC block into at least one TI block of the service data, wherein each TI block includes a variable number of FEC blocks of the service data, wherein a number of the at least one virtual FEC block is defined based on a maximum number of FEC blocks of a TI block and a decoder to decode the time deinterleaved service data.