2x2 MIMO Signal Decoding with Phase Noise Compensation
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Solution Overview
Problem
Current MIMO systems face poor decoding performance due to high phase noise in radio waves with short wavelengths and high frequencies, causing interference between signals in Alamouti coding schemes.
Innovation Solution
A signal decoding method that calculates decoding coefficients using channel fading coefficients and phase noise coefficients obtained through channel estimation, allowing for independent decoding of signals in a 2×2 MIMO system by performing channel estimation twice to separate channel fading and phase noise effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Alamouti coding scheme is used for MIMO system, then spatial diversity gain is improved, but decoding performance deteriorates due to phase noise interference in high frequency radio waves
Solution Approach 1:
The patent segments the channel estimation process into two distinct parts: first estimating channel fading coefficients, then estimating phase noise coefficients separately. This segmentation allows the decoding process to compensate for both channel fading and phase noise effects independently, thereby resolving the interference problem that degrades decoding performance while maintaining spatial diversity gain from Alamouti coding
Solution Approach 2:
The patent changes the approach by introducing separate parameter estimation for phase noise coefficients in addition to channel fading coefficients. By estimating and compensating for phase noise as a distinct parameter, the system maintains the benefits of Alamouti coding while eliminating the degradation caused by phase noise interference in high frequency systems
2Device complexity
If phase noise compensation is not performed, then system complexity is reduced, but decoding performance deteriorates due to signal interference
Solution Approach 1:
The patent segments the compensation process into two sequential steps: first compensating for channel fading using fading coefficients, then compensating for phase noise using separately estimated phase noise coefficients. This segmented approach provides effective interference cancellation without requiring a completely complex redesign of the MIMO system architecture
Solution Approach 2:
The patent introduces phase noise coefficients as an intermediary element that mediates between the received signal and the decoding process. By estimating and applying these coefficients, the system effectively separates and compensates for phase noise interference, improving decoding performance while adding only moderate computational complexity
Data Source
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AI summary
Embodiments of the present invention disclose a signal decoding method, apparatus, and device, so that a good decoding result can be obtained even if phase noises exist at a signal transmit end and a signal receive end in a 2×2 MIMO system. The MIMO system includes a signal transmit end and a signal receive end, the signal receive end includes a first antenna and a second antenna, and the signal transmit end includes a third antenna and a fourth antenna. The method includes: obtaining a first signal received by the first antenna and a second signal received by the second antenna, where the first signal and the second signal are from the third antenna and the fourth antenna of the signal transmit end; calculating a decoding coefficient by using a channel fading coefficient and a phase noise coefficient that are obtained by performing channel estimation based on the first signal and the second signal; and decoding the first signal and the second signal by using the decoding coefficient, to respectively obtain a first decoded signal and a second decoded signal.