Adaptive Antenna Port Mapping for Wireless Feedback Overhead Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in optimizing pilot and feedback overhead adaptively according to the radio channel situation in massive antenna arrays, which affects transmission efficiency and reliability.
Innovation Solution
The method involves adaptively selecting an effective antenna port set and using partial antenna arrays for beamforming, reducing feedback overhead and improving accuracy by configuring the number of antenna ports and pilot patterns based on channel conditions, and applying antenna port shuffling information to balance transmit powers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all antenna ports are used for beamforming in massive antenna arrays, then beamforming gain is improved, but feedback overhead and pilot overhead increase significantly
Solution Approach 1:
The patent extracts only the necessary subset of antenna ports (effective antenna port set) from the complete antenna array for beamforming operations. By identifying and using only the antenna ports that contribute most significantly to beamforming performance, the system reduces feedback overhead while maintaining beamforming gain.
Solution Approach 2:
The patent segments the complete antenna array into an effective antenna port set and inactive antenna ports. This segmentation allows the system to process only the relevant subset of antenna ports for feedback and pilot signaling, reducing overall overhead while preserving the essential beamforming functionality.
2Reliability
If the number of antenna ports is increased to improve transmission diversity, then transmission reliability is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent applies partial action by using only the necessary number of antenna ports (effective set) rather than all available ports. This partial usage achieves sufficient transmission diversity and reliability without incurring the full complexity and processing overhead associated with utilizing all antenna ports.
3Stability of the object's composition
If antenna port shuffling is applied to balance transmit powers, then power distribution uniformity is improved, but additional processing steps are required
Solution Approach 1:
The patent performs antenna port shuffling as a preliminary action before beamforming to pre-balance the transmit powers across antenna ports. By establishing uniform power distribution in advance, the system avoids more complex real-time power adjustment mechanisms during beamforming operations.
Data Source
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AI summary
A method for transmitting a signal to a receiver by a transmitter in a wireless communication system is disclosed. The method includes mapping one or more transmission steams to first logical antenna ports, mapping signals mapped to the first logical antenna ports to second logical antenna ports, and mapping signals mapped to the second logical antenna ports to physical antennas to transmit the signals mapped to the physical antennas to the receiver, wherein the number of the first logical antenna ports is less than or equal to the number of the second logical antenna ports and varies with a channel state between the transmitter and the receiver.