Broadcast Signal Receiver with OFDM Subframe Synchronization
Find Innovative SolutionsGenerate Solutions
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 they need to handle.
Innovation Solution
A broadcast signal receiver is developed with a Fast Fourier Transform (FFT) module for Orthogonal Frequency Division Multiplexing (OFDM)-demodulation, a pilot detector, frame parsing module, demapping and decoding module, and output processing module, which includes Scattered Pilots (SPs) and Subframe Boundary Symbols (SBS) to enhance data transmission efficiency and robustness, allowing for flexible service delivery and error-free reception even with mobile equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital broadcast signal transmission is implemented to provide HD images and multi-channel audio, then service quality is improved, but data transmission efficiency deteriorates due to large amounts of data
Solution Approach 1:
The broadcast signal is divided into multiple subframes, each containing data symbols and subframe boundary symbols. This segmentation allows for efficient processing and transmission of large amounts of data by breaking it into manageable units with embedded synchronization and error correction capabilities.
Solution Approach 2:
Subframe boundary symbols are placed at predetermined positions within each subframe before data transmission. These symbols contain synchronization information and error correction codes that are prepared in advance, enabling the receiver to efficiently synchronize and correct errors without compromising data transmission efficiency.
2Reliability
If robustness of transmission/reception networks is improved for mobile reception equipment, then reception reliability is improved, but device complexity increases
Solution Approach 1:
The subframe boundary symbols contain embedded synchronization and error correction information that enable the receiver to automatically synchronize and correct errors without requiring complex external control systems. The system serves itself by incorporating all necessary correction data within the transmitted signal structure.
3Adaptability or versatility
If network flexibility is improved for various reception environments, then adaptability is improved, but system complexity increases
Solution Approach 1:
The subframe boundary symbols serve multiple functions simultaneously: they provide synchronization information, error correction codes, and frame structure definition. This multi-functionality allows the same signal structure to adapt to various reception environments (mobile, indoor, fixed) without requiring separate specialized systems for each condition.
Data Source
AI summary
Disclosed herein is a broadcast signal receiver. The broadcast signal receiver according to an embodiment of the present invention includes a synchronization and demodulation module configured to perform detection and OFDM demodulation on a received broadcast signal, a frame parsing and deinterleaving module configured to parse and deinterleave the signal frame of the broadcast signal, a demapping and decoding module configured to convert the data of at least one Physical Layer Pipe (PLP) of the broadcast signal into a bit domain and to FEC-decode the PLP data, and an output processing module configured to receive the data of the at least one PLP and to output the received data in a data stream form.