Wireless Communication System Using Combined Beamshaping for Low SNR
Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining accurate channel estimation at low Signal-to-Noise Ratio (SNR) levels, particularly at the cell edge, leading to suboptimal transmission performance due to less accurate weight vector selection in multi-antenna modes.
Innovation Solution
A system that combines primary and secondary beamshaping information from downlink and uplink signals to select and apply weight vectors for subsequent transmissions, using direction of departure variances to improve weight vector selection, thereby enhancing transmission quality and stability, especially at low SNR levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel estimation is performed using prior art methods, then the transmission can proceed, but the channel estimation accuracy deteriorates at low SNR levels
Solution Approach 1:
The patent combines downlink beamshaping information from the UE with uplink beamshaping information measured by the BS to form a composite weight vector. This merging of information from both directions allows the system to leverage the accuracy of downlink channel estimation while compensating for its limitations at low SNR using the independent uplink measurements, thereby resolving the contradiction between transmission reliability and measurement precision.
Solution Approach 2:
The patent introduces beamshaping information as an intermediary element that mediates between the downlink and uplink channels. By using beamshaping information from both directions as a mediator, the system can select optimal weight vectors that improve channel estimation accuracy at low SNR levels without compromising transmission reliability.
2Device complexity
If only downlink beamshaping information is used for weight vector selection, then the system complexity is reduced, but the transmission quality deteriorates at low SNR levels
Solution Approach 1:
The patent merges downlink beamshaping information with uplink beamshaping information to create a more robust weight vector selection mechanism. This combination increases transmission quality at low SNR levels by leveraging diverse measurement sources, while the integration is performed in a manner that manages system complexity through structured information processing.
3Ease of operation
If measurements are performed only on dedicated signals, then the measurement process is simplified, but the beamshaping information accuracy deteriorates
Solution Approach 1:
The patent applies multi-functionality by using the same measurement apparatus and processing logic to extract beamshaping information from multiple signal types including dedicated signals, common reference signals, and data signals. This universal approach maintains ease of operation through consistent measurement procedures while improving accuracy by leveraging information from diverse signal sources.
Data Source
Figure 1a~2
Figure 3~4
Figure 5
AI summary
The present invention relates to a system for wireless communication comprising a first transceiver circuitry (BS) connected to a plurality of virtual antenna ports of an antenna arrangement; each virtual antenna port is a combination of one or more physical antenna ports. The first transceiver circuitry (BS) is configured to: communicate with a second transceiver circuitry (UE) via the antenna ports of the antenna arrangement; receive primary beamshaping information related to a first link (Downlink) between the first transceiver circuitry (BS) and the second transceiver circuitry (UE); determine secondary beamshaping information related to a second link (Uplink) between the second transceiver circuitry (UE) and the first transceiver circuitry (BS); and apply at least one weight vector based on the primary and secondary beamshaping information for subsequent transmission of signals from the first transceiver circuitry (BS) via the plurality of virtual antenna ports of the antenna arrangement.