Wireless Reference Signal Domain Transformation for Interference Reduction
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Solution Overview
Problem
The increasing number of antennas in wireless communication systems leads to a higher density of reference signals, causing interference with data signals and reducing the accuracy of channel state information estimation, especially in MIMO systems where multiple antennas require precise signal identification and channel assessment.
Innovation Solution
Transforming wireless reference signals from the delay-Doppler domain into a collapsed time-frequency domain, allowing for orthogonal multiplexing with data signals, thereby reducing interference and increasing signal strength while maintaining efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antennas is increased to improve wireless communication capacity, then the system can support more users and data traffic, but the density of reference signals increases causing interference with data signals
Solution Approach 1:
The patent transforms reference signals from the time-frequency domain to the delay-Doppler domain, effectively changing the dimensional representation of signals. This domain transformation allows reference signals to be separated from data signals in the delay-Doppler domain while their projections onto the time-frequency domain remain orthogonal, thus eliminating interference without reducing the number of antennas or reference signals.
2Measurement precision
If reference signals are transformed to spread across the frequency-time domain, then antenna identification and signal characteristics can be improved, but interference with other signals increases
Solution Approach 1:
The patent generates reference signals in the delay-Doppler domain where they naturally spread to provide robust channel estimation, then transforms them to the time-frequency domain for orthogonal projection. This two-domain approach allows the reference signals to achieve both goals: spreading for accurate estimation in the delay-Doppler domain while maintaining orthogonality to data signals in the time-frequency domain.
Solution Approach 2:
The delay-Doppler domain acts as an intermediary domain between signal generation and time-frequency domain transmission. By using this intermediate representation, the patent can generate reference signals with desirable spreading properties and then transform them to achieve orthogonality, effectively mediating between the conflicting requirements of signal spreading and interference reduction.
3Reliability
If more reference signals are transmitted to support multiple antennas, then antenna connection identification improves, but resource allocation efficiency decreases
Solution Approach 1:
The patent merges reference signals for multiple antennas into a single transformed signal in the delay-Doppler domain. By generating all reference signals in this domain and then transforming to the time-frequency domain with orthogonal projection, multiple reference signals are effectively combined into a unified transmission that maintains individual antenna identification capabilities while improving resource efficiency.
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 first signal in an initial domain and transforming the first signal into a first portion of a time-frequency grid of a time-frequency domain, resulting in a transformed first signal. The operations further include combining the transformed first signal with a second signal of a second portion of the time-frequency grid, resulting in a combined signal, and transmitting the combined signal to a user equipment device for a further transformation. The operations further include receiving a response signal from the user equipment device that was configured, based on the further transformed first signal.