Wireless Beam Combination Selection for Doppler Shift Compensation
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Solution Overview
Problem
Wireless communication systems face challenges in managing radio channels that undergo Doppler shift, particularly in high-frequency bands where Doppler effects cause signal distortions and interference, affecting transmission reliability and efficiency.
Innovation Solution
A method is proposed where a wireless communication system receives Doppler information on multiple transmission beams, selects a beam combination based on effective Doppler spread values, and transmits signals using at least one beam from the selected combination to optimize signal transmission and reception, thereby compensating for Doppler-induced distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is used to concentrate signals in a particular direction, then signal directivity and transmission distance are increased, but interference to other users and signal blockages cannot be avoided
Solution Approach 1:
The patent segments the transmission process by dividing beams into candidate beams and alternative beams. The base station transmits multiple candidate beams and receives feedback on their quality, then selects the best candidate beam while having alternative beams ready to switch to if blockage occurs. This segmentation allows the system to maintain reliability by having backup transmission paths without continuously transmitting all beams.
Solution Approach 2:
The patent implements dynamic beam switching capability where the base station can transition from candidate beams to alternative beams based on real-time channel conditions and feedback. The system dynamically adjusts beam selection to respond to signal blockages or interference, maintaining optimal transmission reliability without static beam configuration.
2Reliability
If multiple beams are transmitted to overcome Doppler shift, then transmission reliability is improved, but system complexity and computational overhead increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring alternative beams before they are needed. The base station prepares multiple alternative beams in advance and stores them, so when Doppler shift or blockage occurs, the system can immediately switch to a pre-prepared alternative beam without complex real-time computation. This reduces computational overhead during critical transmission moments.
Solution Approach 2:
The patent replaces complex mechanical beam switching with a feedback-driven selection mechanism. Instead of continuously managing multiple beams through complex control mechanisms, the system transmits candidate beams, receives quality feedback from user equipment, and selects the best beam based on this feedback. This substitution simplifies beam management while maintaining reliability under Doppler shift conditions.
3Device complexity
If a single beam is used for transmission, then system complexity is reduced, but transmission reliability decreases due to Doppler-induced signal blockages
Solution Approach 1:
The patent applies partial action by transmitting a limited set of candidate beams (not all possible beams) and selecting the best one based on feedback. This partial approach maintains acceptable reliability without the excessive complexity of managing all possible beams. The system transmits enough beams to ensure reliability under Doppler shift while avoiding the overhead of complete beam management.
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 enables more efficient signal transmission and reception by determining optimal beam combinations, reducing signal blockages and enhancing reliability and throughput in wireless communication systems, especially in high-frequency environments.
Implementation Method 1
Wireless communication systems face challenges in managing radio channels that undergo Doppler shift, particularly in high-frequency bands where Doppler effects cause signal distortions and interference
Data Source
AI summary
A method of transmitting a signal, which is transmitted by a transmitting end in a wireless communication system, is disclosed in the present specification. Specifically, the method includes the steps of receiving Doppler information on a plurality of transmission beams from a receiving end; selecting a beam combination using the received Doppler information, wherein the beam combination is selected from a plurality of beam combinations depending on effective Doppler spread values of the beam combinations, wherein each of the beam combinations consists of two or more transmission beams among the plurality of transmission beams; and transmitting the signal to the receiving end using at least one transmission beam included in the selected beam combination.