Reception Apparatus Phase Variation Compensation in MIMO Systems
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Solution Overview
Problem
In 6G wireless communication systems using high-frequency bands like millimeter waves and terahertz waves, phase noise and frequency offsets cause phase variation issues that deteriorate communication performance, and existing methods do not adequately compensate for independent phase variations across multiple antennas during MIMO transmission.
Innovation Solution
A reception apparatus with channel estimators and control circuitry that performs MIMO separation processing using demodulation and phase tracking reference signals, compensating phase variation by estimating and interpolating channel values to separate transmission streams effectively, even when precoding is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO transmission is used to improve throughput, then communication capacity increases, but phase variation compensation becomes more difficult
Solution Approach 1:
The patent divides the phase variation compensation into separate processing steps: first estimating channel state information using reference signals, then using this information to compensate for phase variations in the MIMO channel. This segmentation allows the system to handle the complexity of MIMO transmission while systematically addressing phase variation issues through dedicated compensation processing stages.
Solution Approach 2:
The patent introduces channel state information as an intermediary element that mediates between the MIMO transmission process and phase variation compensation. By first obtaining channel state information through reference signals and then using this intermediary information to guide the compensation process, the system can effectively separate and address phase variation issues from the complex MIMO transmission.
2Device complexity
If phase variation compensation is performed without precoding information, then compensation processing is simpler, but compensation accuracy deteriorates
Solution Approach 1:
The patent performs preliminary actions by first obtaining channel state information using reference signals before the actual phase variation compensation. This preliminary estimation of the channel state allows the system to prepare compensation parameters in advance, improving accuracy without requiring complex real-time processing during the actual compensation stage.
Solution Approach 2:
The patent employs feedback mechanisms where channel state information obtained from reference signals is fed back into the compensation process. This feedback loop allows the system to continuously refine and adjust phase variation compensation based on actual channel conditions, improving accuracy while managing processing complexity through iterative refinement rather than complex one-time calculations.
Data Source
AI summary
A reception apparatus includes reception circuitry which, in operation, receives a signal transmitted in multiple-input multiple-output (MIMO) transmission, and control circuitry which, in operation, controls compensation of phase variation of the signal by using information related to transmission precoding with respect to the signal in a transmission apparatus.