Multi-Antenna Channel Estimation via Self-Calibration
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Solution Overview
Problem
In multi-antenna systems, the efficiency of communication is reduced due to the increased amount of channel state information (CSI) feedback required as the number of antennas or users increases, leading to inefficiencies in channel estimation and calibration.
Innovation Solution
A method for controlling transmission and reception of signals in a multi-antenna apparatus that estimates channel state using a signal transmitter, receiver, and controller, which calculates calibration values based on transfer functions to adjust signal amplitudes and phases, allowing for efficient communication without external devices or CSI feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antennas or users in a multi-antenna system increases, then the system capacity and coverage are improved, but the amount of CSI feedback increases leading to reduced communication efficiency
Solution Approach 1:
The base station performs self-calibration by comparing its own transmission signal (third signal) with the received signal (second signal) from the terminal. This self-service approach eliminates the need for external calibration devices and reduces CSI feedback overhead by enabling the system to automatically correct its own channel estimation errors without requiring extensive feedback information.
Solution Approach 2:
The patent introduces a calibration signal mechanism as an intermediary that facilitates accurate channel estimation. By transmitting a known calibration signal and comparing it with the received signal, the system creates an intermediate reference point that enables accurate channel state determination without requiring direct feedback of complete channel information, thus reducing feedback overhead.
2Measurement precision
If traditional CSI feedback methods are used in multi-antenna systems, then channel state information can be obtained, but communication efficiency is greatly reduced due to the large amount of feedback required
Solution Approach 1:
The patent implements a selective feedback mechanism where only essential calibration information is fed back from the terminal to the base station, rather than complete CSI. The base station uses this minimal feedback along with its own transmitted calibration signals to determine accurate channel state, thereby maintaining measurement precision while significantly improving communication efficiency by reducing feedback overhead.
Solution Approach 2:
The patent extracts only the necessary calibration information from the complete channel state, separating the essential calibration parameters from the full CSI. By transmitting and processing only this extracted calibration information, the system achieves accurate channel estimation without the overhead of complete CSI feedback, thus resolving the contradiction between precision and efficiency.
3Productivity
If the number of antennas increases to improve system performance, then coverage and capacity are enhanced, but the complexity of channel estimation and calibration increases
Solution Approach 1:
The patent segments the channel estimation process into distinct calibration phases and data transmission phases. By separating calibration signal processing from data signal processing, and by dividing the multi-antenna channel estimation into individual antenna element calibration followed by combined channel estimation, the system manages the complexity of large-scale MIMO systems more effectively, enabling high system performance without overwhelming computational burden.
Data Source
AI summary
A multi-antenna apparatus for controlling transmission and reception of signals based on channel estimation includes: a signal transmitter configured to transmit a first signal using a multi-antenna; a signal receiver configured to receive a second signal using the multi-antenna based on the transmitted first signal; a signal transferrer configured to receive a third signal received from the signal transmitter and provide the third signal to the signal receiver; and a controller configured to estimate a channel state of the multi-antenna based on the second signal and the third signal obtained from the signal receiver, and control transmission and reception of signals through the multi-antenna according to the estimated channel state.