Broadcast Signal Framing With Segmented Pilots for Mobile Reception
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Solution Overview
Problem
Current digital broadcast systems face challenges in efficiently transmitting large amounts of data, ensuring robustness, and flexibility, especially in mobile reception environments, due to limitations in data transmission efficiency and network robustness.
Innovation Solution
The method involves using a system that multiplexes data from multiple broadcast services in the time domain and transmits them through the same RF signal bandwidth, employing techniques like OFDM, MIMO, LDPC decoding, and specific pilot signal management to optimize data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continual pilots are inserted into signal frames to improve signal robustness and enable mobile reception, then reception reliability improves, but data transmission efficiency deteriorates due to increased overhead
Solution Approach 1:
The patent segments the continual pilots into two distinct sets: a first set inserted in every signal frame for basic signal robustness, and a second set inserted selectively based on channel conditions for enhanced mobile reception. This segmentation allows the system to optimize between overhead and performance by activating only the necessary pilot set, thereby resolving the contradiction between reliability and transmission efficiency.
2Productivity
If multiple broadcast services are multiplexed in the time domain to improve spectrum utilization, then data transmission efficiency improves, but system complexity increases
Solution Approach 1:
The patent implements a universal pilot insertion mechanism that handles multiple broadcast services through a unified framework. The same pilot insertion logic and signal processing procedures are applied across different services multiplexed in the time domain, allowing the system to manage multiple services without proportionally increasing complexity. This multi-functionality approach enables efficient spectrum utilization while maintaining manageable system complexity.
Data Source
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AI summary
A method and an apparatus for transmitting broadcast signals thereof are disclosed. The method for transmitting broadcast signals includes encoding DP data according to a code rate, wherein the encoding further includes LDPC encoding the DP data according to the code rate, bit interleaving the LDPC encoded DP data, mapping the bit interleaved DP data onto constellations, MIMO (Multi Input Multi Output) encoding the mapped DP data, and time interleaving the MIMO encoded DP data; building at least one signal frame by arranging the encoded DP data; and modulating data in the built signal frame by OFDM method and transmitting the broadcast signals having the modulated data, wherein the step of modulating includes inserting CPs in the built signal frame based on a CP set which includes information about locations of CPs, wherein the CP set is defined based on FFT size.