Wireless Reference Signal Domain Transformation for Interference Reduction
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Solution Overview
Problem
The increasing number of antennas in wireless communication systems, particularly in MIMO technologies, leads to a higher density of reference signals that can interfere with data signals, degrading channel state information estimation and causing interference in shared resource elements.
Innovation Solution
Transforming wireless reference signals from the delay-Doppler domain into the time/frequency domain for transmission, allowing for reduced overhead and interference by spreading the signal across more resource elements, thereby increasing signal strength and reducing interference with data signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antennas is increased to support MIMO technologies, then the system capacity and spatial multiplexing capability are improved, but the number of reference signals increases leading to higher interference with data signals
Solution Approach 1:
The patent transforms reference signals from the time domain to the frequency domain by applying discrete Fourier transform (DFT) across frequency bins. This dimensional transformation spreads the reference signal energy across multiple frequency resources rather than concentrating it in time, thereby reducing time-domain interference while maintaining channel state information estimation accuracy.
Solution Approach 2:
The patent changes the parameter domain in which reference signals are transmitted. Instead of transmitting in the traditional time domain, the system transforms reference signals into the frequency domain, changing the resource allocation pattern from time-based to frequency-based spreading, which reduces overlap with data signals in the time domain.
2Productivity
If reference signals are transmitted in the time domain using shared resources, then resource efficiency is improved, but interference with data signals increases degrading channel state information estimation
Solution Approach 1:
The patent applies discrete Fourier transform to move reference signals from the time domain to the frequency domain. This transformation spreads reference signals across multiple frequency bins, reducing their concentration in any single time slot and thereby reducing interference with data signals while maintaining estimation accuracy through frequency-domain processing.
Solution Approach 2:
The patent segments the reference signal transmission across multiple frequency resources rather than concentrating it in a single time resource. By dividing the reference signal into frequency-domain components and transmitting them across multiple frequency bins, the system reduces the interference density in any given time slot while preserving the overall signal strength for accurate channel estimation.
3Strength
If reference signals are concentrated in specific time resources, then signal strength is maintained, but interference with data signals in shared resources increases
Solution Approach 1:
The patent transforms reference signals from time-domain concentration to frequency-domain distribution using DFT. This maintains the overall signal strength through energy conservation in the transformation while spreading the signal across frequency resources, thereby reducing time-domain interference with data signals that share the same time slots.
Solution Approach 2:
The patent creates frequency-domain copies of the reference signal across multiple frequency bins instead of transmitting a single concentrated time-domain signal. These frequency copies collectively represent the same reference signal energy distributed across time and frequency, maintaining signal strength while reducing temporal interference concentration.
Data Source
AI summary
According to an embodiment, a system can comprise a processor and a memory that can store executable instructions that, when executed by the processor, facilitate performance of operations. The operations can include generating a reference signal in an initial domain, and first transforming the reference signal into a time-frequency domain, resulting in a first transformed reference signal. The operations can further include transmitting the first transformed reference signal to a user equipment for a second transformation to be applied to the transformed reference signal by the user equipment, resulting in a second transformed reference signal. Further, in response to the transmitting the first transformed reference signal, receiving a signal from the user equipment that was configured, based on the second transformed reference signal.