Broadcast Signal Framing With PLPs and Pilots for Mobile Reception
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Solution Overview
Problem
Current digital broadcast signal transmission technologies face challenges in data transmission efficiency, robustness, and network flexibility, especially for mobile reception and indoor environments, due to the large amounts of video/audio data and additional services required in digital broadcasts.
Innovation Solution
A broadcast signal transmitter that processes input data through an input formatting module, Bit Interleaved and Coded Modulation (BICM) module, framing module, pilot insertion, and Inverse Fast Fourier Transform (IFFT) module for OFDM-modulation, allowing for error correction and flexible transmission of digital broadcast signals using Physical Layer Pipes (PLPs) with Scattered Pilots and Subframe Boundary Symbols, optimizing data carriers and null carriers based on service characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If digital broadcast signals transmit large amounts of video/audio data and additional services, then service functionality is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The broadcast signal is divided into multiple Physical Layer Pipes (PLPs), each capable of carrying different types of data (video, audio, additional services). This segmentation allows efficient resource allocation and transmission optimization for different data types, improving overall transmission efficiency while maintaining service functionality.
Solution Approach 2:
The patent introduces a hierarchical frame structure with multiple dimensions (frames, subframes, symbols) and employs both time and frequency domains for data transmission. By utilizing scattered pilots and subframe boundary symbols in the time-frequency grid, the system achieves efficient multi-dimensional resource allocation that improves data transmission efficiency without compromising service functionality.
2Adaptability or versatility
If digital broadcast signals include various types of additional data, then service diversity is improved, but transmission robustness deteriorates
Solution Approach 1:
Scattered pilots are inserted at predetermined positions throughout the transmission frame before data transmission. These pilots serve as reference signals that enable the receiver to perform channel estimation and equalization in advance, compensating for channel variations and improving transmission robustness even when carrying diverse additional data services.
Solution Approach 2:
Subframe boundary symbols act as intermediary elements between different data segments. These symbols contain subframe boundary pilots that facilitate synchronization and channel estimation at frame boundaries, ensuring transmission robustness while allowing flexible allocation of diverse data types within the frame structure.
3Adaptability or versatility
If broadcast signals are optimized for mobile reception, then reception flexibility is improved, but transmission robustness deteriorates
Solution Approach 1:
The patent employs a dynamic frame structure where the positions and densities of scattered pilots can be adjusted based on channel conditions. For mobile reception, pilots are placed at positions that account for Doppler shifts and time-varying channel characteristics, enabling the system to adapt to mobile environments while maintaining transmission robustness through optimized pilot placement.
Data Source
AI summary
Disclosed herein is a broadcast signal transmitter. The broadcast signal transmitter according to an embodiment of the present invention includes an input formatting module configured to perform baseband formatting and to output at least one Physical Layer Pipe (PLP) data, a BICM module configured to perform error-correction processing on the PLP data, a framing and interleaving module configured to interleave the PLP data and to generate a signal frame, and a waveform generation module configured to insert a preamble into the signal frame and to generate a broadcast signal by OFDM-modulate the signal frame.