MU-MIMO Terminal Interference Estimation and Suppression
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Solution Overview
Problem
In MU-MIMO radio communication systems, simultaneous signal transmission to multiple users leads to inter-user interference, degrading transmission quality due to the inability to effectively suppress interference between users.
Innovation Solution
A terminal equipped with a reception unit to receive information associated with signals from other users and a reference signal from a base station, and a control unit to estimate and suppress interference, thereby improving data signal reception from the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MU-MIMO is applied to improve system throughput, then system throughput is improved, but inter-user interference increases and transmission quality deteriorates
Solution Approach 1:
The patent converts the harmful inter-user interference into a useful signal for interference estimation. By providing reference signals from other users and using them to estimate the interference channel, the system transforms the interference problem into a solution where the interference characteristics are known and can be suppressed, thereby maintaining high throughput while improving transmission quality.
Solution Approach 2:
The patent performs preliminary interference estimation before data reception. The base station transmits reference signals from other users in advance, allowing the terminal to estimate the interference channel beforehand. This preliminary action enables the terminal to prepare interference suppression strategies before actual data transmission, improving transmission quality without sacrificing throughput.
2Quantity of substance
If signals are simultaneously multiplexed for multiple users, then system capacity is improved, but inter-user interference occurs and degrades signal quality
Solution Approach 1:
The patent introduces reference signals as an intermediary element. These reference signals from other users serve as mediators that carry information about the interference channel. By using these intermediary signals, the terminal can estimate and suppress interference without directly receiving the harmful interference, thus maintaining system capacity while reducing its impact on signal quality.
3Reliability
If interference suppression is implemented, then transmission quality is improved, but system complexity increases
Solution Approach 1:
The patent implements self-service interference suppression where each terminal independently estimates and suppresses interference using the provided reference signals. The terminal uses its own receiver to capture reference signals from other users, performs autonomous channel estimation, and applies interference suppression without requiring complex coordination with other terminals, thus improving transmission quality while limiting complexity growth.
Data Source
AI summary
A terminal includes a reception unit configured to receive information associated with a signal transmitted to an apparatus other than the terminal, in MU-MIMO (MultiUser-Multiple Input Multiple Output) and a reference signal from a base station, a control unit configured to estimate interference from the signal transmitted to the apparatus other than the terminal to a signal transmitted to the terminal, based on the information associated with the signal transmitted to the apparatus other than the terminal and the reference signal, and a communication unit configured to suppress the interference and receive a data signal from the base station.