Uplink MIMO Antenna Power Matching via Reflected Power Feedback
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Solution Overview
Problem
Coherent uplink MIMO transmissions in wireless communications are hindered by amplitude mismatches between antennas, leading to decreased transmission performance and throughput, which conventional power adjustments fail to adequately address.
Innovation Solution
A UE measures reflected power at its antennas to estimate radiated power loss and adjusts input power based on these measurements to reduce amplitude mismatch, thereby improving transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the UE adjusts input power based on conducted amplitude mismatch, then the amplitude mismatch in the transmission line is reduced, but the radiated amplitude mismatch remains greater than predicted due to different output impedance at each antenna
Solution Approach 1:
The patent implements a feedback mechanism where the UE measures the actual radiated amplitude mismatch at each antenna and uses this measurement to adjust the input power independently for each antenna. This closed-loop feedback allows the system to compensate for impedance differences and achieve accurate amplitude matching in the radiated signal, resolving the contradiction between predicted and actual mismatch reduction.
Solution Approach 2:
The patent changes the parameter adjustment approach from uniform input power adjustment to per-antenna input power adjustment based on measured radiated amplitude mismatch. By individually tuning the input power parameter for each antenna according to its specific radiated characteristics, the system achieves accurate amplitude matching despite different output impedances.
2Reliability
If the UE increases input power for an antenna with higher reflected power, then the radiated power loss is compensated, but the overall transmission power may exceed the UE's power limit
Solution Approach 1:
The patent applies local quality by adjusting the input power independently for each antenna based on its specific reflected power characteristics. Instead of uniformly increasing power for all antennas, the system only increases power for antennas that require it to compensate for radiated power loss, while maintaining appropriate power levels for antennas with lower reflected power, thus optimizing overall power consumption.
Solution Approach 2:
The patent applies partial action by selectively increasing input power only for antennas with high reflected power that cause amplitude mismatch, rather than increasing power for all antennas. This selective approach compensates for radiated power loss where needed while avoiding excessive power consumption across the entire transmission system.
3Manufacturing precision
If the UE measures reflected power at each antenna to estimate radiated power loss, then amplitude mismatch in radiated signals is reduced, but the device complexity increases due to additional measurement and adjustment mechanisms
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously measure its own reflected power and adjust its input power without external intervention. The UE uses its built-in measurement capabilities to estimate radiated power loss and independently tunes its transmission parameters, eliminating the need for complex external measurement equipment or manual configuration while achieving accurate amplitude matching.
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
The method effectively reduces amplitude mismatch in radiated signals, enhancing transmission performance and throughput in coherent MIMO scenarios.
Implementation Method 1
measuring a first amount of reflected power associated with a first antenna of the UE, measuring a second amount of reflected power associated with a second antenna of the UE
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may measure a first amount of reflected power associated with a first antenna of the UE and measure a second amount of reflected power associated with a second antenna of the UE. The UE may adjust an input power for the first antenna based at least in part on the first amount of reflected power or the second amount of reflected power and may perform a transmission via the first antenna using the adjusted input power for the first antenna. For example, the UE may increase the input power for the first antenna by an amount that is based at least in part on the first amount of reflected power.