Hybrid Beamforming Open-Loop MIMO for High-Frequency Data Rate
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Solution Overview
Problem
Current wireless communication systems face challenges in increasing data rate and service coverage due to radio wave propagation loss at higher frequencies, which existing technologies have not adequately addressed through spectral efficiency improvements alone.
Innovation Solution
The implementation of an Open-Loop Multiple-Input Multiple-Output (MIMO) transmission method using a hybrid beamforming structure, where the transmitter determines a digital precoder without receiver feedback, allowing for efficient signal transmission and reception across multiple antennas in ultra-high frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spectral efficiency improvement is pursued to increase data rate, then data rate increases, but service coverage cannot meet exponentially growing wireless data traffic demand
Solution Approach 1:
The patent segments the transmission system into multiple independent antenna ports (at least two antenna ports), allowing parallel transmission of different data streams. This segmentation enables spatial multiplexing where each antenna port transmits independently, thereby increasing overall data rate while maintaining service coverage through distributed transmission paths.
Solution Approach 2:
The patent introduces a spatial dimension by utilizing multiple antenna ports for transmission. Instead of relying solely on frequency or time dimensions for data rate improvement, the system adds spatial multiplexing through multiple antennas, enabling data to be transmitted across multiple spatial paths simultaneously, thus increasing productivity without compromising coverage.
2Productivity
If higher transmission frequency is used to increase data rate, then data rate increases, but radio wave propagation loss increases resulting in reduced service coverage
Solution Approach 1:
The transmission signal is segmented into multiple independent streams transmitted through different antenna ports. This segmentation allows the system to exploit spatial diversity, where at least one antenna port experiences favorable propagation conditions, thereby compensating for high path loss at elevated frequencies and maintaining reliable connectivity.
Solution Approach 2:
The system implements feedback mechanisms where the receiver measures channel conditions and provides information back to the transmitter. This feedback enables the transmitter to adapt its transmission strategy across multiple antenna ports, selecting optimal paths that minimize propagation loss effects and maintain data rate performance despite high frequency challenges.
3Productivity
If multiple antenna ports are used for MIMO transmission, then data rate and spatial diversity improve, but system complexity increases
Solution Approach 1:
The system segments the MIMO transmission into multiple independent antenna ports with dedicated reference signals for each port. This segmentation simplifies the overall system design by allowing independent processing and measurement for each antenna port, reducing the complexity of channel estimation and data processing compared to fully coupled MIMO systems.
Solution Approach 2:
The patent employs preliminary actions by transmitting dedicated reference signals from each antenna port before actual data transmission. These reference signals enable advance channel measurement and quality assessment, allowing the system to pre-determine optimal transmission parameters and reduce real-time processing complexity during data transmission phases.
Data Source
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AI summary
A method for a transmitter of a mobile communication system transmitting and receiving signals according to an embodiment of the present specification comprises the steps of: transmitting to a receiver system information for transmitting a signal to the receiver including a connection between a wireless resource and a transmitting antenna; transmitting a reference signal to the receiver based on the system information; and receiving from the receiver feedback information generated based on the reference signal. According to an embodiment of the present specification, in a beamforming transmission method of a mobile communication system, a transmitter can determine whether to perform digital pre-coding without advance information from a receiver and can consequently perform a transmission, and can thereby perform lower-overhead and efficient signal transmission/reception.