MIMO Phase Noise Compensation Across Pre- and Post-Separation
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Solution Overview
Problem
Existing MIMO transmission systems in high-frequency bands like millimeter waves and terahertz waves are susceptible to phase noise, leading to common phase error and inter-carrier interference, which degrade communication performance without adequate compensation methods.
Innovation Solution
A communication apparatus and method that compensates phase noise in the pre-stage and post-stage of MIMO separation processing, controlled by a control unit based on conditions such as local oscillator commonality and accuracy, phase noise levels, and frequency bands, using phase noise compensators and MIMO reception processors to improve signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO transmission is used to improve throughput, then communication capacity increases, but phase noise susceptibility increases leading to common phase error and inter-carrier interference
Solution Approach 1:
The phase noise compensation is segmented into two distinct stages: pre-MIMO separation processing and post-MIMO separation processing. Each stage handles different aspects of phase noise compensation independently, allowing optimized treatment for each processing phase while maintaining overall system throughput
Solution Approach 2:
Phase noise compensation is performed in the pre-stage before MIMO separation processing to preliminarily mitigate phase noise effects. This preliminary action reduces common phase error and inter-carrier interference before the complex MIMO separation operation, improving subsequent processing accuracy
2Reliability
If phase noise compensation is performed in both pre-stage and post-stage of MIMO separation, then communication performance improves, but system complexity increases
Solution Approach 1:
The system dynamically selects the phase noise compensation stage (pre-stage, post-stage, or both) based on operating conditions such as frequency band, phase noise level, and local oscillator characteristics. This dynamic adaptation optimizes performance while avoiding unnecessary complexity in conditions where simpler compensation suffices
Solution Approach 2:
The compensation strategy changes parameters such as compensation timing, processing order, and algorithm selection based on system conditions including phase noise magnitude, frequency band, and available signal power, allowing flexible trade-off between performance and complexity
3Measurement precision
If phase noise compensation is performed in pre-stage of MIMO separation, then common phase error is reduced, but inter-carrier interference may increase
Solution Approach 1:
The system performs phase noise compensation in both pre-stage and post-stage, where the pre-stage compensation addresses common phase error while the post-stage compensation specifically targets and removes inter-carrier interference that may be introduced. The harmful inter-carrier interference is converted into a manageable issue by applying targeted compensation in the appropriate stage
Data Source
AI summary
A communication apparatus includes reception circuitry which, in operation, receives a signal transmitted in a multiple-input multiple-output (MIMO) transmission, and control circuitry which, in operation, controls phase noise compensation of the signal in at least one of a pre-stage or a post-stage of MIMO separation processing in accordance with a condition.