Smart Antenna Interference Rejection Beam Scanning
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Solution Overview
Problem
Existing mobile/nomadic wireless devices using omnidirectional antennas face challenges in achieving reliable communication due to self-interference from adjacent base stations, leading to inadequate coverage and reduced system capacity, as they require strict separation methods that limit coverage area.
Innovation Solution
A smart antenna system that uses a control subsystem, radio transceiver, and antenna subsystem to scan and select the best combination of base stations, channels, and beams for optimal signal quality, establishing test links to determine the most reliable communication path and switch between them pseudo-randomly during downtime intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If omnidirectional antennas are used for coverage, then coverage area is improved, but self-interference from adjacent base stations increases
Solution Approach 1:
The omnidirectional antenna coverage is segmented into multiple directional beams, each covering a specific sector. The system divides the 360-degree coverage into discrete beam directions, allowing selective activation of beams to serve different spatial regions while maintaining overall coverage capability.
Solution Approach 2:
The antenna system dynamically switches between different directional beams based on real-time signal quality measurements and interference conditions. The beam selection is not static but adapts continuously to changing environmental conditions, allowing the system to optimize between coverage and interference avoidance.
2Reliability
If strict separation between base stations is implemented to avoid interference, then signal quality is improved, but system capacity is reduced
Solution Approach 1:
The system applies different quality characteristics to different spatial directions through directional beams. Each beam is optimized for its specific sector, providing high signal quality locally in that direction while allowing other beams to serve other sectors simultaneously, thereby maintaining overall system capacity.
Solution Approach 2:
The system transitions from temporal separation (time-division) or frequency separation to spatial separation through directional beams. By adding the spatial dimension to the separation mechanism, multiple base stations can operate simultaneously on the same frequency without interfering with each other, as each transmits in a different spatial direction.
3Area of stationary object
If omnidirectional antennas capture signals from multiple base stations, then coverage is maintained, but signal quality deteriorates due to interference
Solution Approach 1:
The system segments the omnidirectional radiation pattern into multiple directional beams, each covering a specific angular sector. This segmentation allows the receiver to select only the beam from the desired base station while rejecting signals from other directions, maintaining coverage while improving signal quality.
Solution Approach 2:
The system converts the harmful omnidirectional interference into a beneficial directional selection mechanism. By using directional beams, the system exploits the spatial separation of base stations to its advantage, selecting the best signal from available directions and using beamforming to enhance the desired signal while suppressing interference from other directions.
4Measurement precision
If periodic scanning is used for beam selection, then tracking accuracy is improved, but communication interruptions increase
Solution Approach 1:
The system performs beam scanning periodically at predetermined intervals rather than continuously. This periodic action allows the system to maintain accurate beam selection while minimizing the time spent on scanning operations, thereby reducing communication interruptions and maintaining high data transmission efficiency.
Solution Approach 2:
Instead of scanning all possible beams continuously, the system performs partial scanning by evaluating only a subset of beams or using previous scanning results to guide current selection. This reduces the scanning overhead and minimizes communication interruptions while maintaining sufficient tracking accuracy.
Data Source
AI summary
A smart antenna system is provided for communicating wireless signals between a mobile device and a plurality of different fixed base stations using one or more channels and one or more beams. The smart antenna system includes a control subsystem, a radio transceiver and an antenna subsystem coupled to each other and adapted to perform scanning of one or more combinations of base stations, channels and beams using one or more test links established with one or more of the fixed base stations where the test links use at least some of the channels and the beams. A first combination of base station, channel and beam is selected based on the scanning; and a first operating link is established for transmitting a wireless signal to the selected base station using the selected channel and beam.