MIMO Transmitter Signal Preparation with Adaptive Mutual Coupling DPD
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Solution Overview
Problem
Crosstalk between transmitter antennas in MIMO systems reduces performance and existing solutions, such as crossover digital predistorter models, are complex and resource-intensive.
Innovation Solution
A method and device that determine the mutual correlation between signals from different antennas and selectively employ either a digital predistortion procedure considering mutual coupling or not, along with power back-off strategies, to mitigate crosstalk effects efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a crossover digital predistorter model is used to compensate for crosstalk and nonlinearity in MIMO transmitters, then the compensation performance is improved, but the device complexity and resource requirements increase significantly
Solution Approach 1:
The patent changes the parameter of DPD model complexity by switching between a first DPD procedure (considering mutual coupling) and a second DPD procedure (not considering mutual coupling) based on the mutual correlation indicator. This allows the system to use a simpler model when crosstalk is not significant, reducing computational complexity while maintaining compensation performance when needed.
Solution Approach 2:
The patent implements a dynamic selection mechanism where the transmitter device dynamically switches between different DPD procedures based on real-time mutual correlation indicators. This dynamic adaptation allows the system to optimize between performance and complexity based on current transmission conditions, rather than always using the complex crossover digital predistorter model.
2Reliability
If a first DPD procedure considering mutual coupling is always applied, then crosstalk compensation is improved, but computational costs and resource usage increase
Solution Approach 1:
The patent applies the first DPD procedure (considering mutual coupling) only partially - specifically, only when the mutual correlation indicator exceeds a threshold value. When the indicator is below the threshold, the simpler second DPD procedure is used. This partial application of the complex procedure reduces overall computational costs while maintaining adequate crosstalk compensation when actually needed.
Solution Approach 2:
The patent changes the operational parameter of the DPD procedure based on the mutual correlation indicator. By monitoring this indicator and switching between procedures, the system adapts computational resource usage to actual crosstalk conditions, reducing energy consumption when full compensation is not required.
3Productivity
If multiple transmission antennas are used to increase transfer capacity in MIMO systems, then the data throughput is improved, but crosstalk between antennas increases and reduces transmitter performance
Solution Approach 1:
The patent implements a feedback mechanism where the transmitter device obtains a mutual correlation indicator from the transmission channel and uses this feedback to select appropriate signal preparation procedures. This feedback loop allows the system to detect crosstalk conditions and adaptively apply compensation measures, maintaining transmitter performance despite the presence of multiple antennas.
Solution Approach 2:
The patent applies preliminary anti-action by using digital predistortion procedures that pre-compensate for crosstalk effects before transmission. The first DPD procedure specifically accounts for mutual coupling between antennas, applying corrective distortion in advance to counteract the expected crosstalk, thereby maintaining signal integrity in MIMO systems.
Data Source
AI summary
It is presented a method for determining how to prepare transmission signals for transmission. The method is performed in a transmitter device and comprises the steps of: obtaining an indicator of mutual correlation between signals transmitted from different transmission antennas of the transmitter device; when the indicator indicates mutual correlation less than a threshold value, selecting a first transmission signal operation scheme; and when the indicator indicates a mutual correlation greater than the threshold value, selecting a second transmission signal operation scheme.