MMSE Reception Coefficient Adaptation for Interference Cancellation
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Solution Overview
Problem
Conventional methods for signal reception in mobile communication systems using multiple receive antennas fail to effectively cancel interference signals, leading to reduced data restoration performance due to individual channel estimation and loss of information on antenna correlations.
Innovation Solution
A method and apparatus that utilize a Minimum Mean-Squared Error (MMSE) scheme to adaptively calculate and apply coefficients based on time/frequency-domain correlation characteristics of signals received from multiple antennas, dividing the signal into regions with high channel correlation for efficient interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional MRC reception method is used with individual channel estimation, then the reception process is simple, but interference signals cannot be effectively canceled and data restoration performance deteriorates
Solution Approach 1:
The patent changes the estimation approach from individual antenna channel estimation to joint multi-antenna channel estimation. By estimating channel conditions across all receive antennas simultaneously and calculating correlation between antennas, the system captures spatial signal characteristics that individual estimation misses, enabling effective interference cancellation while maintaining operational feasibility
Solution Approach 2:
The patent introduces channel correlation calculation as an intermediary step between channel estimation and signal combining. By computing the correlation matrix between receive antennas based on estimated channel conditions, the system creates a mediator that enables the MRC process to account for signal correlations and cancel interference effectively
2Device complexity
If individual channel estimation is performed for each antenna, then the calculation complexity is low, but information on antenna correlations is lost
Solution Approach 1:
The patent merges the channel estimation processes of multiple receive antennas into a single joint estimation operation. Instead of estimating channels independently for each antenna, the system performs unified channel estimation that captures the statistical relationships and correlations between antennas, preserving spatial signal information that would otherwise be lost
3Ease of operation
If conventional MRC combining is applied to correlation-rich interference signals, then the combining process is straightforward, but system performance reduces due to channel estimation errors
Solution Approach 1:
The patent implements a feedback mechanism where channel correlation information obtained from joint estimation is fed back into the signal combining process. The correlation matrix derived from channel conditions informs the MRC weights, creating a feedback loop that adapts the combining process to the actual spatial signal characteristics, thereby canceling interference and improving performance
Data Source
AI summary
Method and Apparatus for controlling combining coefficients of multiple receive antennas according to the channel conditions in a mobile communication system, to improve data restoration performance. A mobile station detects preamble, pilot and data from a signal received from a base station via the multiple receive antennas, measures a channel correlation from the detected preamble, classifies time-domain/frequency-domain intervals having a channel correlation exceeding a predetermined threshold as calculation regions, and calculates MMSE coefficients for the calculation regions. In this way, the mobile station finds the optimal coefficients for combining the signal received via the multiple receive antennas, thereby optimizing the reception performance.