MIMO Broadcast Transceiver with Phase Hopping and Precoding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Digital broadcast systems face challenges in enhancing data transmission efficiency, maintaining robustness, and ensuring compatibility with conventional systems, especially in indoor environments and with mobile reception equipment.
Innovation Solution
The implementation of a MIMO system with SVC technologies, where broadcast signals are encoded per PLP or frame, allowing for efficient data transmission and error-free reception even in challenging environments, while maintaining compatibility with conventional systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a MIMO system is introduced to enhance data transmission efficiency, then data transmission efficiency and robustness are improved, but device complexity and system compatibility are worsened
Solution Approach 1:
The MIMO system is segmented into multiple independent transmission paths (layers), each handling specific data streams. The encoding and modulation processes are divided into separate functional blocks, allowing independent optimization and processing of each path while maintaining overall system performance.
Solution Approach 2:
The MIMO transceiver is designed with multi-functionality to operate in both MIMO mode and conventional single-antenna mode. The system can adaptively switch between different transmission schemes based on channel conditions and receiver capabilities, ensuring backward compatibility while providing enhanced performance when conditions permit.
2Reliability
If MIMO encoding is applied to improve signal robustness in indoor environments, then reception reliability is improved, but system complexity and processing requirements are worsened
Solution Approach 1:
MIMO encoding and preprocessing operations are performed in advance at the transmitter side, including channel estimation, precoding matrix selection, and signal mapping. This preliminary processing prepares the signals for robust transmission through multiple antennas, reducing the computational burden on the receiver and enabling reliable decoding even in challenging indoor environments.
3Adaptability or versatility
If conventional broadcast systems are maintained for compatibility, then system compatibility is improved, but data transmission efficiency and robustness are worsened
Solution Approach 1:
The broadcast system is designed with universal compatibility features, allowing it to function as both a conventional single-antenna system and an advanced MIMO system. Receivers can selectively activate MIMO processing based on their capabilities, while transmitters can adaptively choose between conventional and MIMO transmission modes, ensuring broad compatibility across different device generations.
Solution Approach 2:
The system implements dynamic transmission mode selection, where the transmitter adapts between conventional and MIMO modes based on channel conditions, receiver capabilities, and service requirements. This dynamic behavior allows the system to optimize performance when MIMO is available while maintaining seamless compatibility with conventional receivers that lack MIMO functionality.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method for transmitting broadcast signals, the method comprising, demultiplexing Physical Layer Pipe,PLP data into first and second input signals, Quadrature Amplitude Modulation, QAM, mapping the first and second input signals onto constellations, Multi-input Multi-Output, MIMO, processing the QAM mapped first and second input signals, wherein the MIMO processing includes pre-coding processing and phase hopping processing, wherein the pre-coding processing is performed by using a pre-coding matrix which is carried out on pairs of normalized QAM symobls, wherein the phase hopping processing is performed by using a phase hopping matrix, building at least two signal frames by mapping the MIMO processed first and second input signals and modulating data in the at least two signal frames by an Orthogonal Frequency Division Multiplexing, OFDM, method and transmitting at least two broadcast signals having the modulated data by at least two transmit antennas.