Inter-Antenna Interference Cancellation in Orthogonally Coded Signal Reception
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Solution Overview
Problem
In mobile telecommunication systems, the fading phenomenon causes interference between orthogonally coded signals transmitted through multiple antennas, leading to quality deterioration due to varying radio channel conditions, making it challenging to apply receive diversity schemes effectively in downlink environments.
Innovation Solution
An apparatus and method that cancel inter-antenna interference by generating a channel state matrix, detecting data using inverse or pseudo-inverse matrices, and eliminating pseudo interference signals, while determining data detection priority based on signal differences and covariance matrix analysis to enhance data detection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If orthogonally coded signals are transmitted through multiple antennas to increase data transmission capacity, then the amount of data provided by the mobile telecommunication system increases, but inter-antenna interference occurs due to fading phenomenon, leading to quality deterioration
Solution Approach 1:
The patent extracts and removes the interference component from the received signal. The receiver separates the desired signal from the interference caused by other antennas, effectively taking out the harmful interference element to restore signal quality while maintaining multi-antenna transmission capacity
Solution Approach 2:
The patent implements a feedback mechanism where the receiver detects the channel state and feeds back interference information to enable interference cancellation. This feedback loop allows the system to adapt to fading conditions and maintain signal quality by continuously compensating for inter-antenna interference
2Reliability
If receive diversity scheme is applied to overcome fading phenomenon, then signal quality improves, but it is difficult to apply in downlink due to limited terminal size
Solution Approach 1:
Instead of implementing receive diversity at the terminal (which would increase device complexity), the patent inverts the approach by implementing transmit diversity at the base station and processing diversity at the receiver through interference cancellation algorithms, achieving diversity benefits without adding physical antenna complexity to the terminal
Solution Approach 2:
The patent introduces signal processing algorithms as an intermediary between the physical antennas and the data detection process. This intermediary layer performs interference cancellation and channel compensation, achieving diversity effects without requiring complex physical terminal structures
3Productivity
If multiple data streams are transmitted orthogonally to increase throughput, then data transmission efficiency increases, but interference between streams occurs due to varying channel conditions
Solution Approach 1:
The patent performs preliminary channel estimation and interference prediction before data detection. By anticipating the interference patterns based on channel state information, the system can pre-calculate cancellation signals to remove interference before it degrades the orthogonally coded streams
Solution Approach 2:
The patent dynamically adjusts detection parameters and processing weights based on channel conditions. By changing the parameters of the interference cancellation algorithm according to varying channel states, the system maintains effective interference suppression across different fading conditions while preserving data transmission efficiency
Data Source
AI summary
An apparatus and a method for canceling inter-antenna interference are provided. The apparatus to cancel inter-antenna interference includes a reception unit to receive, from a transmitter, first data and second data orthogonally coded with the first data, and to generate a received vector including the first data and the second data, a channel estimation unit to generate a channel state matrix with respect to a radio channel from a plurality of transmission antennas of the transmitter to the reception unit, a detection unit to detect the first data based on the channel state matrix and the received vector, a pseudo interference signal-generation unit to generate pseudo interference signals based on the channel state matrix and the detected first data, and an interference signal-canceling unit to cancel the pseudo interference signals from the received vector.