MIMO Broadcast Transmitter Phase Rotation Matrix
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Solution Overview
Problem
Digital broadcast systems face challenges in data transmission efficiency, robustness, and compatibility, particularly in indoor and mobile environments, where conventional methods struggle to maintain error-free signal reception and compatibility with existing systems.
Innovation Solution
The implementation of a MIMO (Multi-Input Multi-Output) system for transceiving broadcast signals, which involves MIMO-encoding and OFDM-modulating input signals using a phase rotation matrix to adjust power levels, ensuring compatibility with conventional systems and enhancing data transmission efficiency and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MIMO encoding is applied to enhance data transmission efficiency and robustness, then transmission reliability improves, but device complexity increases
Solution Approach 1:
The MIMO encoding process is segmented into distinct functional blocks: a MIMO encoder that applies space-time block coding, an OFDM modulator that processes each encoded stream separately, and a transmitter that handles multiple antennas. This segmentation allows the complex MIMO operation to be broken down into manageable, modular components that can be implemented and maintained more easily.
Solution Approach 2:
The patent introduces intermediate processing stages between the input signal and final transmission. The MIMO encoder acts as an intermediary that transforms input symbols into encoded streams, which are then further processed by the OFDM modulator before transmission. These intermediary components simplify the overall system design by creating clear interfaces and processing stages.
2Productivity
If MIMO-encoding and OFDM-modulation are used to improve data transmission efficiency, then productivity increases, but device complexity increases
Solution Approach 1:
The patent merges MIMO encoding with OFDM modulation in an integrated transmitter system. The MIMO encoder outputs are directly fed into the OFDM modulator, which processes multiple encoded streams simultaneously. This merging of functions allows the system to achieve high data transmission efficiency by utilizing both MIMO spatial diversity and OFDM frequency diversity without requiring separate, standalone systems.
Solution Approach 2:
The system transitions from single-antenna transmission to multi-antenna MIMO transmission, adding a spatial dimension to the data transmission. By encoding data across multiple antennas and combining this with OFDM's frequency-domain processing, the system exploits multiple dimensions (space and frequency) simultaneously to dramatically increase data transmission efficiency and throughput.
3Adaptability or versatility
If phase rotation matrix is applied to adjust power levels for compatibility, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent employs a phase rotation matrix that dynamically adjusts the power levels and phase of transmitted signals based on the specific MIMO encoding scheme being used. By changing the parameter (phase rotation angle) according to the modulation type and encoding scheme, the system maintains compatibility across different transmission modes while adapting to optimize performance for each specific configuration.
Data Source
AI summary
A method for transmitting broadcast signals in a transmitter includes encoding data for Physical Layer Pipes (PLPs), mapping the encoded data onto constellations according to modulation types, multi-input multi-output (MIMO) processing the mapped data for the MIMO processing by multiplying a rotation matrix with a pair of symbols of the mapped data and applying a phase rotation matrix to the multiplied symbols, time interleaving the MIMO processed data, building frames by mapping the time interleaved data, frequency-interleaving data in the built frames, modulating the frequency-interleaved data by an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and transmitting the broadcast signals including the modulated data. The frames includes signaling information for signaling data in the frames. The signaling information includes information on a PLP identifier.