Non-Coherent MU-MIMO Power Sharing for High Mobility
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Solution Overview
Problem
Current MU-MIMO wireless communication systems face limitations in high mobility scenarios like vehicular communications due to channel estimation errors and pilot pollution, which degrade performance and reduce data rates.
Innovation Solution
A non-coherent MU-MIMO transmission method that estimates signal-to-noise ratio and selects power sharing factors for each receiver, transmitting a combined signal without pilot signals, allowing robust communication and avoiding pilot interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coherent communication techniques with pilot signals are used, then channel estimation accuracy is improved, but resource consumption increases and data rates are reduced
Solution Approach 1:
The patent extracts and removes the pilot signal transmission component from the communication system. By using non-coherent detection techniques, the system eliminates the need for dedicated pilot signals for channel estimation, thereby freeing up radio resources that can be reallocated to data transmission, thus increasing overall data rates while maintaining acceptable performance through alternative detection methods
Solution Approach 2:
The patent changes the fundamental parameter of detection methodology from coherent detection (which requires channel state information) to non-coherent detection. This parameter change allows the system to operate without pilot signals, transforming the communication approach to one that is robust to channel variations and does not require explicit channel estimation, thereby improving resource efficiency and data rates
2Reliability
If pilot signals are transmitted for channel estimation, then communication reliability is improved, but pilot pollution and interference occur in high mobility scenarios
Solution Approach 1:
The patent converts the harmful effect of pilot pollution into a benefit by adopting non-coherent detection. Instead of trying to mitigate pilot interference through more sophisticated estimation techniques, the system fundamentally changes the detection approach to be independent of channel state information. This transforms the problem from one where pilot signals are harmful to one where their absence is beneficial, as the system achieves reliability through detection methods that are inherently robust to channel variations without requiring pilot signals
3Reliability
If more pilots are transmitted to reduce channel estimation errors, then performance in high mobility scenarios is improved, but available resources for data transmission are reduced
Solution Approach 1:
The patent extracts the pilot signal transmission requirement from the system by implementing non-coherent detection. This eliminates the need to allocate radio resources to pilot signals, freeing up all available resources for data transmission. The system achieves high mobility performance not by increasing pilot transmission but by removing the dependency on channel estimation entirely
Solution Approach 2:
The patent performs preliminary action by designing the transmission scheme to be inherently robust to channel variations from the outset. By using non-coherent detection techniques that do not require channel state information, the system is prepared in advance to handle high mobility scenarios without needing to dynamically adjust pilot transmission levels, thereby consistently maximizing resource availability for data transmission
Data Source
AI summary
A non-coherent multi-user MIMO communication method is disclosed. Firstly, a data transmission method includes the acts of a) estimating the signal-to-noise ratio for each receiver; b) selecting a power sharing factor for each receiver; c) encoding information to be sent to each receiver into a symbol for each receiver; and d) transmitting, by a transmitter, a signal that includes the power sharing factors and the symbols for all of the receivers. Furthermore, a reception method includes the acts of: i) receiving the power sharing factor; ii) decoding the signal corresponding to the highest power sharing factor; iii) determining if the signal decoded in step ii) corresponds to the current receiver; iv) if the decoded signal corresponds to the current receiver, finalize the reception; and v) if the decoded signal does not correspond to the current receiver, proceed with the following power sharing factors.