Multi-Antenna Reception Weight Correction for Doppler Compensation
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Solution Overview
Problem
Existing wireless communication systems face challenges in demodulating multiple signals received by different antennas due to asynchronous data and interference, leading to degraded communication quality and varying signal-to-noise ratios caused by Doppler shifts and phase variations.
Innovation Solution
A reception device using multiple antennas with a weight generation, correction, and combining unit to compensate for Doppler shifts and improve signal reception quality by beamforming and interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a static beamforming weight is used to combine signals from multiple antennas, then the device complexity is reduced, but the received signal to noise ratio varies with time due to Doppler frequency effects, degrading communication quality
Solution Approach 1:
The patent applies dynamics by transitioning from static beamforming weights to time-varying weights that adapt to changing channel conditions. The beamforming weight is updated based on current channel state information to track Doppler frequency effects, ensuring optimal signal combination despite time-varying propagation conditions.
Solution Approach 2:
The patent changes the parameter of beamforming weight from static to dynamic by incorporating time-varying adjustments based on Doppler frequency estimation. The weight parameters are continuously adapted to compensate for frequency shifts caused by relative motion between transmitter and receiver, maintaining stable received signal to noise ratio.
2Device complexity
If signals from multiple antennas are combined without Doppler compensation, then the device complexity is reduced, but the received signal to noise ratio varies due to phase variations from Doppler frequency, degrading communication quality
Solution Approach 1:
The patent applies preliminary action by performing Doppler frequency estimation and compensation before the beamforming combination process. The received signal undergoes preliminary correction for Doppler-induced phase variations, ensuring that subsequent beamforming operations work with compensated signals, thereby stabilizing the received signal to noise ratio.
Solution Approach 2:
The patent introduces an intermediary Doppler compensation step between signal reception and beamforming combination. This intermediary process estimates and corrects Doppler frequency effects, acting as a mediator that prepares the signal for optimal beamforming processing and prevents phase variations from degrading communication quality.
3Reliability
If successive interference cancellation is used to remove interfering signals, then communication quality is improved, but the system requires precise signal separation which becomes difficult with asynchronous signals from multiple transmission devices
Solution Approach 1:
The patent applies dynamics by using time-varying beamforming weights that adapt to changing channel conditions and signal characteristics. This dynamic approach enables better separation of asynchronous signals from multiple transmission devices by continuously optimizing the combining process, thereby improving communication quality without requiring overly complex static signal separation schemes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances communication quality by stabilizing signal reception and increasing the number of demodulatable signals through adaptive weight correction and combining techniques.
Implementation Method 1
a weight correction unit to perform correction, on the weight, in order to compensate for a Doppler shift between the signals received individually by the antennas on the basis of the frequency of the signals received individually by the antennas
Data Source
AI summary
A reception device receives, by a plurality of antennas, signals in which a plurality of radio signals are superimposed, the reception device including: a weight generation unit that generates a weight for beamforming in order to improve reception quality of a desired signal, which is one of the plurality of the radio signals, on the basis of a reception timing and a frequency of the signals received individually by the antennas; a weight correction unit that performs correction, on the weight, in order to compensate for a Doppler shift between the signals received individually by the antennas on the basis of the frequency of the signals received individually by the antennas; and a combining unit that combines the signals received individually by the antennas using the weight obtained after the correction.