Multi-Antenna Broadcasting Transmission with Polarized Wave Segmentation
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Solution Overview
Problem
Terrestrial digital television broadcasting using the ISDB-T scheme faces challenges with poor spectral efficiency and limited suitability for local broadcasting, as simultaneous broadcasting for mobile terminals uses only a fraction of the frequency band, leading to reduced reception quality and service area limitations.
Innovation Solution
A transmission method employing multi-antenna encoding schemes, where two transmit stations transmit broadcasting signals with different polarized waves using the same frequency band, allowing for overlapping service areas with one service area being narrower than the other, and utilizing pilot signals with varying densities for modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If simultaneous broadcasting for mobile terminals uses the same frequency band as HDTV broadcasting, then reception performance is improved, but spectral efficiency deteriorates
Solution Approach 1:
The service area is segmented into a first service area with a first broadcasting signal and a second service area with a second broadcasting signal. By dividing the coverage area and using different multi-antenna encoding schemes for each segment, the system achieves both wide coverage with high spectral efficiency and localized coverage with optimized reception performance, resolving the contradiction between spectral efficiency and reception quality.
Solution Approach 2:
Different multi-antenna encoding schemes are applied to different service areas based on their specific requirements. The first service area uses one encoding scheme optimized for wide coverage, while the second service area uses another scheme optimized for reception performance. This local optimization allows each area to achieve its target performance without compromising overall spectral efficiency.
2Loss of energy
If a single frequency band is used for both wide and narrow service areas, then spectral efficiency is improved, but reception quality in overlapping areas deteriorates
Solution Approach 1:
The system dynamically selects different multi-antenna encoding schemes for different service areas based on their specific requirements. The first transmit station uses a first encoding scheme for the first service area, while the second transmit station uses a second encoding scheme for the second service area. This dynamic adaptation allows the system to maintain high reception quality in overlapping areas while preserving spectral efficiency through frequency band reuse.
3Area of stationary object
If multi-antenna encoding schemes are used for simultaneous broadcasting, then service area expansion is achieved, but system complexity increases
Solution Approach 1:
The system segments the broadcasting service into multiple transmit stations, each responsible for a specific service area. Each transmit station independently implements multi-antenna encoding schemes for its designated area. This segmentation allows service area expansion while managing complexity by distributing the computational burden across multiple stations rather than requiring a single complex centralized system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances spectral efficiency, improves reception performance, expands service areas, and enables high-image-quality broadcasting services, including local broadcasting, by effectively utilizing the same frequency band for both wide and narrow service areas.
Implementation Method 1
polarized wave transmitted from the first transmit station differs from polarized wave transmitted from the second transmit station
Data Source
AI summary
By a transmission method according to one aspect of the present disclosure, in a broadcasting system that generates a first broadcasting signal and a second broadcasting signal by performing multi-antenna encoding on program data, and wirelessly transmits a first broadcasting signal and a second broadcasting signal, a first transmit station transmits the first broadcasting signal, a second transmit station transmits the second broadcasting signal, the first transmit station and the second transmit station transmit the first broadcasting signal and the second broadcasting signal to an overlapping area at an identical time using an overlapping frequency band, polarized wave transmitted from the first transmit station differs from polarized wave transmitted from the second transmit station, and arrangement of the first transmit station differs from arrangement of the second transmit station.