OFDM Broadcast Reception Using Virtual FEC Time Deinterleaving
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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 transmission of multiple services through the same RF signal bandwidth and improving QoS, robustness, and transmission efficiency using MIMO systems.
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 multiple services increase
Solution Approach 1:
The patent segments broadcast services into multiple logical channels, each carrying different service data. This segmentation allows multiple services to be transmitted simultaneously through the same RF bandwidth by dividing the data stream into separate logical paths, thereby improving transmission efficiency while maintaining manageable system complexity through structured organization.
Solution Approach 2:
The patent implements a universal transmission framework that can handle multiple types of broadcast services (e.g., audio, video, data services) through the same RF signal bandwidth. The system uses a unified modulation and multiplexing approach that accommodates different service types, achieving multi-functionality without requiring separate transmission paths for each service.
2Reliability
If virtual FEC blocks are inserted into TI blocks, then robustness of broadcast signal transmission is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent applies forward error correction (FEC) encoding in advance to the broadcast signal data before transmission. By pre-inserting virtual FEC blocks into the time interleaving (TI) blocks, the system prepares error correction capability beforehand, ensuring robustness against transmission errors without requiring complex real-time processing during reception.
Solution Approach 2:
The patent introduces virtual FEC blocks as intermediary elements within the time interleaving structure. These virtual blocks act as mediators that provide error correction functionality without directly complicating the core transmission system. The FEC mechanism serves as an intermediate layer that protects the actual service data while maintaining a relatively simple overall system architecture.
3Adaptability or versatility
If time deinterleaving with variable FEC blocks is used, then adaptability to different service characteristics is improved, but difficulty of detecting and measuring system parameters increases
Solution Approach 1:
The patent implements dynamic time deinterleaving where the number of FEC blocks in each TI block can vary according to service characteristics. This dynamic structure allows the system to adapt to different service requirements (e.g., different error tolerance levels for different service types) by adjusting the FEC block configuration, thereby improving versatility while maintaining manageable parameter detection through standardized adjustment rules.
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.