Open-Loop MIMO Polarization Hopping for 5G Interference Reduction
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Solution Overview
Problem
In 5G communication systems, the coexistence of multiple communication services on adjacent frequency resources leads to mutual interference and hardware issues with analog-digital converters (ADC) or digital-analog converters (DAC), degrading system performance, especially when base stations have different coverage areas or locations.
Innovation Solution
Implementing an open loop multi-input multi-output (MIMO) transmission method that transmits polarization hopping pattern information to enable signal decoding without requiring channel state information, allowing for efficient signal transmission and reception using a single RF chain, thereby reducing interference and hardware complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple communication services coexist on adjacent frequency resources, then frequency/space resource utilization is improved, but mutual interference and hardware issues with ADC/DAC occur
Solution Approach 1:
The patent segments the frequency resources by introducing time-division multiplexing through polarization hopping patterns. Different communication services are allocated different polarization patterns that change over time, effectively dividing the shared frequency spectrum into time-polarization slots. This segmentation allows multiple services to coexist on adjacent frequencies while preventing mutual interference through temporal separation and polarization differentiation.
2Reliability
If closed-loop transmission is used, then signal transmission reliability is improved, but feedback overhead and circuit complexity increase
Solution Approach 1:
The patent extracts and eliminates the feedback mechanism from the transmission system by adopting an open-loop approach. Instead of using closed-loop transmission that requires channel state information feedback, the system pre-configures polarization hopping patterns that are independently determined. This extraction of the feedback component removes the associated complexity while maintaining transmission reliability through the inherent properties of polarization diversity and hopping patterns.
3Productivity
If multiple RF chains are used in terminal, then multi-user MIMO capability is improved, but cost and power consumption increase
Solution Approach 1:
The patent introduces dynamic polarization hopping patterns that change over time, allowing the system to achieve multi-user MIMO capability with a single RF chain. The dynamics of polarization switching create temporal diversity that compensates for the static limitation of having only one RF chain. This dynamic approach enables the terminal to multiplex multiple users in the time-polarization domain without requiring multiple physical RF chains, thereby reducing power consumption and cost while maintaining multi-user capability.
Data Source
AI summary
This disclosure relates to a 5G or pre-5G communication system that will be provided to support higher data rates than a 4G communication system such as LTE. According to the present invention, in a method for transmitting, by a transmitter, a signal to a receiver, a transmitter transmits information on a polarization hopping pattern to a receiver and transmits a signal to a receiver according to a hopping pattern indicated by the polarization hopping pattern information. The receiver changes the polarization of the antenna according to the hopping pattern and receives the signal.