Full-Duplex Beam Calibration for Self-Interference Reduction
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Solution Overview
Problem
Current wireless communications systems lack mechanisms for performing self-calibration procedures to determine self-interference in full-duplex capable devices, such as customer premises equipment (CPEs, which are essential for enhancing spectral efficiency, reducing latency, and increasing network throughput.
Innovation Solution
Full-duplex capable wireless devices transmit a request for self-calibration resources to a network entity, receive resource allocations, and measure received signals to estimate a channel matrix between uplink and downlink antenna panels, adjusting beams iteratively to minimize self-interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full-duplex capable wireless devices operate without self-calibration procedures, then device complexity is reduced, but self-interference measurement precision deteriorates
Solution Approach 1:
The patent performs self-calibration procedures in advance to estimate the channel matrix between transmit and receive antenna panels before full-duplex operations begin. This preliminary action allows the device to pre-determine self-interference characteristics, enabling accurate self-interference measurement without adding complexity during actual operation. The channel matrix estimation is computed beforehand using reference signals transmitted during calibration phases.
2Productivity
If beam adjustment procedures are implemented to minimize self-interference, then communication efficiency is improved, but processing time increases
Solution Approach 1:
The patent implements an iterative beam adjustment process where the device transmits reference signals, measures received signals at antenna panels, estimates the channel matrix, and adjusts beams based on this feedback. This closed-loop feedback mechanism enables the system to progressively minimize self-interference while maintaining efficient communication. The feedback-driven approach optimizes beam configurations without requiring excessive processing time by using measured channel state information.
3Productivity
If self-calibration resources are allocated for channel matrix estimation, then spectral efficiency is improved, but resource consumption increases
Solution Approach 1:
The patent designs self-calibration reference signals that serve multiple functions simultaneously: they enable channel matrix estimation for self-interference cancellation, support beam adjustment procedures, and provide channel state information for communication optimization. This multi-functional approach allows the system to allocate calibration resources efficiently, as the same reference signals and processing routines benefit multiple objectives, thereby improving spectral efficiency without proportionally increasing resource consumption.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described in which a full-duplex capable wireless device may determine that a self-calibration for self-interference is to be performed, and may transmit a request for self-calibration resources to a network entity. The network entity may grant a set of resources for self-calibration, and provide that the granted resources are not used for communications with other wireless devices. The full-duplex capable wireless device, using the set of resources, may transmit an uplink reference signal from an uplink antenna panel, and measure received signals at its downlink antenna panel to estimate a channel matrix associated with the interference between the uplink and downlink antenna panels. The full-duplex capable wireless device may select half-duplex uplink and downlink beams, and then adjust the selected beams for full-duplex communications based on the estimated channel matrix for the interference between the uplink and downlink antenna panels.