Antenna Pattern Variability for Transmit Diversity
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Solution Overview
Problem
Existing transmit diversity devices face challenges in maximizing diversity gain, as the wave patterns from multiple antennae often result in destructive interference, with receiving base stations located outside maximum power regions, leading to suboptimal signal reception and increased power consumption.
Innovation Solution
The use of two antennae with non-uniform power transmission gain patterns, where the minimum power region of one antenna overlaps with the maximum power region of the other, and a processor to adjust transmit diversity parameters based on feedback from receiving devices, ensuring simultaneous transmission of signals with optimal orientation to enhance diversity gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wave patterns from multiple antennas are matched to coincide and constructively interfere, then diversity gain is maximized at maximum power regions, but base stations located in minimum power regions receive insufficient signal power
Solution Approach 1:
The patent applies dynamics by making the antenna pattern configurable and adjustable rather than fixed. The system dynamically switches between different antenna patterns (first and second patterns) depending on the base station's location relative to maximum and minimum power regions, optimizing signal delivery for each scenario
Solution Approach 2:
The patent changes the antenna radiation pattern parameter to resolve the contradiction. By switching between different antenna patterns with different radiation characteristics, the system adapts to different base station locations, ensuring reliable signal reception while avoiding excessive power consumption
2Reliability
If antenna patterns are optimized for maximum power regions, then diversity gain is increased, but coverage in minimum power regions deteriorates
Solution Approach 1:
The system dynamically selects between different antenna patterns based on the base station's position. When the base station is in a maximum power region, one pattern provides high diversity gain; when in a minimum power region, the alternative pattern ensures adequate coverage, thus expanding the effective coverage area while maintaining reliability
Solution Approach 2:
The antenna radiation pattern parameter is changed between two configurations to balance diversity gain and coverage area. The first antenna pattern optimizes for diversity gain in certain directions, while the second pattern compensates for coverage in other directions, achieving both objectives through parameter switching
3Device complexity
If signals from multiple antennas are transmitted simultaneously with fixed patterns, then transmission complexity is reduced, but interference control and signal optimization become suboptimal
Solution Approach 1:
The system introduces dynamic pattern switching capability without significantly increasing transmission complexity. The processor selectively activates either the first or second antenna pattern based on feedback, providing adaptive signal optimization while maintaining relatively simple system architecture
Solution Approach 2:
The system uses feedback from the base station to determine which antenna pattern to employ. This feedback mechanism enables the system to adapt to varying channel conditions and base station locations, improving signal quality while keeping the control logic relatively simple
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
This configuration increases diversity gain by extending the coverage of maximum power regions to include areas previously receiving minimal signals, thereby reducing overall power consumption and improving signal strength across a broader geographical range.
Implementation Method 1
a first antenna having a first power transmission gain pattern and a second antenna having a second power transmission gain pattern
Implementation Method 2
matching the wavepatterns of the signals from different antennae so that the signals coincide and constructively interfere
Implementation Method 3
minimize destructive interference of signals at the base station
Data Source
AI summary
A device, system, and method for providing a transmit diversity device have a first antenna and a second antenna. The first antenna may have a first power transmission gain pattern, which may be non-uniform in a reference plane. The second antenna may have a second power transmission gain pattern, which may be non-uniform in a reference plane. The first and second antennae may be arranged with respect to each other such that a minimum power region of the first gain pattern overlaps a maximum power region of the second gain pattern in the reference plane. The transmit diversity device may also have a processor to receive a feedback parameter from a feedback device. The processor may produce a different transmit diversity parameter based on the feedback parameter for each of a first and second signals to be transmitted on the first and second antennae, respectively.