Antenna Selection for LoS-MIMO Channel Capacity in Aerial Vehicles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In new radio (NR) communication networks, especially for aerial vehicles, the channel capacity during initial access is affected by the relative position of the aerial vehicle with respect to the base station, leading to fluctuations in communication quality due to the dominance of the line of sight (LoS) channel, which limits the transmission rate and distance.
Innovation Solution
A method and apparatus that involve receiving and transmitting synchronization signal blocks (SSBs) through multiple antennas, calculating channel capacity, and selecting the optimal antenna combination for maximum channel capacity, allowing for communication using a combination of antennas with the highest capacity, while also adjusting the terminal's position for improved communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If beamforming technology is applied to extend signal arrival distance, then communication distance is extended, but channel capacity changes according to relative position of aerial vehicle
Solution Approach 1:
The system dynamically selects antenna combinations based on real-time channel capacity measurements. The base station transmits SSBs through multiple antenna combinations, the aerial vehicle measures channel capacity for each combination, and feeds back the optimal combination index. The base station then uses the selected antenna combination for subsequent communication, allowing the system to adapt to changing relative positions and maximize channel capacity while maintaining extended communication distance
Solution Approach 2:
The system changes the transmission parameters by selecting different antenna combinations from the available antennas. Instead of using a fixed antenna configuration, the system varies the antenna combination based on measured channel capacity values, thereby optimizing the communication performance for different relative positions of the aerial vehicle
2Productivity
If multiple antennas are used for spatial multiplexing, then transmission rate is increased, but channel capacity fluctuates with relative position changes
Solution Approach 1:
The system implements a feedback mechanism where the aerial vehicle measures channel capacity for each antenna combination, feeds back the optimal combination index to the base station, and the base station uses this feedback information to select the best antenna combination for communication. This feedback loop ensures that the transmission rate is maximized while maintaining communication quality stability despite relative position changes
Solution Approach 2:
The base station performs preliminary transmission of SSBs through multiple antenna combinations before actual communication begins. This preliminary action allows the aerial vehicle to measure and evaluate channel capacity for each combination in advance, enabling the system to pre-select the optimal antenna combination and avoid fluctuations during subsequent communication
Data Source
AI summary
An operation method of a terminal for initial access in a communication system may comprise: receiving a plurality of SSBs having different indexes through a plurality of antennas included in a base station; calculating a channel capacity using the plurality of SSBs; feeding back, to the base station, index(es) of one or more SSBs for having a maximum channel capacity among the plurality of SSBs; and performing communication with the base station through a combination of two or more antennas that have transmitted the one or more SSBs for having the maximum channel capacity among the plurality of antennas.