MIMO Transmitter Power Control via Feedback Normalization
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Solution Overview
Problem
MIMO communication systems face challenges in ensuring consistent output characteristics across multiple transmitters, leading to potential failures in meeting manufacturer quality control requirements and affecting system performance and manufacturing costs.
Innovation Solution
A method for power control in MIMO systems involves measuring signal strengths, providing feedback via a return channel, and adjusting signal power offsets for individual transmitters to normalize their output within predetermined tolerances, either during factory calibration or in real-time operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmitters are used in MIMO systems to increase data throughput and link range, then system capacity and reliability are improved, but output characteristics become inconsistent across transmitters leading to quality control failures
Solution Approach 1:
The patent applies parameter changes by adjusting the signal power offset for each individual transmitter based on measured signal strengths. The receiver measures the signal strength from each transmitter and feeds back this information, allowing the transmitter to modify its output power parameter to achieve consistent overall output characteristics across all transmitters, thereby resolving the quality control issue while maintaining high data throughput
Solution Approach 2:
The patent implements a feedback mechanism where the receiver measures the signal strength from each transmitter and provides this information back to the transmitter via a feedback channel. This feedback loop enables continuous adjustment of transmitter output characteristics to maintain consistency, solving the problem of varying output characteristics across multiple transmitters while preserving the productivity benefits of MIMO systems
2Ease of manufacture
If transmitter output characteristics are not closely matched, then manufacturing costs are reduced, but system performance deteriorates due to inconsistent signal output
Solution Approach 1:
The patent enables manufacturers to produce transmitters with relaxed tolerance specifications by implementing dynamic parameter adjustment. Each transmitter's signal power offset is adjusted based on measured performance rather than requiring precise manufacturing matching, thus improving ease of manufacture while maintaining system reliability through software-based compensation
Solution Approach 2:
The system implements self-service by having each transmitter automatically adjust its own output characteristics based on feedback about its measured signal strength. This self-adjustment mechanism allows transmitters with varying manufacturing characteristics to autonomously compensate for their differences, maintaining system reliability without requiring tight manufacturing tolerances
Data Source
AI summary
The return channel in a multiple-input and multiple-output (MIMO) communication system is used to provide signal information on an individual-channel basis. In one embodiment, in a controlled factory environment, this information may be used to incrementing up or down the variable gain amplifier and/or the power amplifier of a MIMO transmitter and/or receiver so as to generate a default signal power offset to be used during normal operation. Thereafter, such signal information may similarly be provided via the return channel and used to further adjust the transmit parameters to account for location-specific signal conditions.