Adaptive Antenna Scaling for Wireless Reference Signal Transmission
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting reference signals due to increased complexity and overhead with a large number of antennas, leading to pilot and feedback overhead issues and reduced accuracy.
Innovation Solution
The method involves transmitting a first non-precoded pilot signal and a second non-precoded pilot signal through adaptive antenna scaling, where the number of second logical antenna ports is greater than the first, allowing for adaptive configuration of logical antennas to reduce pilot and feedback overhead and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of antennas are used to improve channel state information measurement accuracy, then measurement precision is improved, but pilot overhead and feedback overhead increase
Solution Approach 1:
The patent segments the set of N antenna ports into two groups: a first set of K antenna ports (where K < N) that transmit first non-precoded pilot signals for channel state information measurement, and a second set of N-K antenna ports that transmit second non-precoded pilot signals for determining the number of logical antenna ports. This segmentation allows the system to reduce pilot overhead by not requiring pilot signals from all N antenna ports while still enabling accurate channel state information measurement through the first set of K antenna ports.
2Measurement precision
If a large number of antennas are used to improve channel state information measurement accuracy, then measurement precision is improved, but feedback overhead increases
Solution Approach 1:
The patent segments the antenna ports into two functional groups with different feedback requirements. The first set of K antenna ports transmits first non-precoded pilot signals that require channel state information feedback, while the second set of N-K antenna ports transmits second non-precoded pilot signals used to determine the number of logical antenna ports without requiring additional feedback. This segmentation reduces feedback overhead by eliminating the need for feedback corresponding to all N antenna ports.
Solution Approach 2:
The second non-precoded pilot signals act as an intermediary mechanism that enables the determination of the number of logical antenna ports without requiring direct feedback about these ports. By using the second pilot signals to infer the number of logical antenna ports, the system avoids the feedback overhead that would otherwise be required to report channel state information for all N antenna ports.
3Quantity of substance
If adaptive antenna scaling is implemented to reduce pilot overhead, then pilot overhead is reduced, but device complexity increases
Solution Approach 1:
The patent implements dynamic adaptation by allowing the number of logical antenna ports to be determined based on the second non-precoded pilot signals rather than being fixed. This dynamic approach enables the system to adaptively scale the number of antenna ports used for data transmission based on channel conditions and requirements, reducing pilot overhead while managing complexity through standardized procedures for determining the number of logical antenna ports.
Data Source
AI summary
A method for transmitting a signal to a receiver by a transmitter in a wireless communication system is disclosed. The method includes transmitting information about a first non-precoded pilot signal and information about a second non-precoded pilot signal to the receiver, transmitting the first non-precoded pilot signal the second non-precoded pilot signal to the receiver, and transmitting one or more transmission streams to the receiver through first logical antenna ports and second logical antenna ports, wherein the number of the first logical antenna ports is less than or equal to the number of the second logical antenna ports, the first non-precoded pilot signal is a pilot signal for measuring channel state information at the receiver, and the second non-precoded pilot signal is a pilot signal for determining the number of the first logical antenna ports.