Broadcast Signal PLP Interleaving for Robust Multi-Service Transmission
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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 error-free reception, especially with mobile or indoor reception equipment.
Innovation Solution
The method involves formatting input streams into Physical Layer Pipes (PLPs), encoding, time interleaving, and waveform modulation for transmission, and the reverse process for reception, using techniques like cell interleaving, bit interleaving, and constellation mapping to manage data transmission efficiently and flexibly across the same RF signal bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If digital broadcast signals transmit large amounts of video/audio data and additional services, then service quality and functionality are improved, but data transmission efficiency and network robustness deteriorate
Solution Approach 1:
The patent segments broadcast data into multiple PLPs (Physical Layer Pipes) with different priorities and service types. Each PLP can be independently transmitted and received, allowing efficient resource allocation. The segmentation enables the system to handle large amounts of data by dividing it into manageable units that can be transmitted through the same RF bandwidth simultaneously, thus improving transmission efficiency while maintaining service quality.
2Adaptability or versatility
If multiple broadcast services are multiplexed in time domain through the same RF signal bandwidth, then network flexibility and bandwidth utilization are improved, but system complexity and signal processing requirements increase
Solution Approach 1:
The patent divides the broadcast system into multiple PLPs that can be independently configured and transmitted. Each PLP represents a separate service stream that can be multiplexed in the time domain within the same RF bandwidth. This segmentation approach enables flexible service multiplication while managing complexity through standardized processing blocks for each PLP.
Solution Approach 2:
The patent creates a universal PLP structure that can carry different types of broadcast services (video, audio, data) through the same transmission framework. The same RF signal bandwidth and processing architecture serve multiple service types simultaneously, achieving multi-functionality without proportionally increasing system complexity.
3Reliability
If time interleaving and cell permutation techniques are applied to improve robustness against signal degradation, then reception reliability is improved, but processing time and computational complexity increase
Solution Approach 1:
The patent applies time interleaving and cell permutation techniques during the transmission preparation phase rather than during reception. By pre-arranging the data sequence and distributing it across different time slots and PLPs before transmission, the system builds robustness against signal degradation in advance. This preliminary action reduces the processing burden and time required during actual reception, as the receiver simply needs to deinterleave and reassemble the pre-processed data.
Data Source
AI summary
The present invention provides a method of transmitting broadcast signals. The method includes, formatting, by an input formatting block, input streams into plural PLPs (Physical Layer Pipes); encoding, by an encoder, data in the plural PLPs; time interleaving, by a time interleaver, the encoded data in the plural PLPs, wherein the time interleaving includes: cell interleaving, by a cell interleaver, the encoded data by permuting cells in a FEC (Forward Error Correction) block in the plural PLPs; frame mapping, by a framer, the time interleaved data onto at least one signal frame; and waveform modulating, by a waveform block, the mapped data in the at least one signal frame and transmitting, by the waveform block, broadcast signals having the modulated data.