Smart Antenna Beamforming for Interference Rejection
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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 like time, frequency, or code division that compromise total system capacity.
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 based on signal quality, establishing test links to optimize wireless signal transmission and reception, thereby enhancing communication reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If omnidirectional antennas are used to provide coverage in all directions, then coverage area is improved, but signal quality deteriorates due to interference from adjacent base stations
Solution Approach 1:
The patent applies local quality by making different parts of the antenna system serve different functions: multiple antenna elements create directional beams for focused communication, while the overall system maintains omnidirectional coverage capability. The smart antenna selectively activates specific antenna elements and adjusts beamforming weights to optimize signal quality in different spatial directions, allowing simultaneous coverage and interference rejection.
Solution Approach 2:
The patent implements dynamics through the smart antenna's ability to dynamically adjust beamforming weights and select different antenna elements based on real-time channel conditions, mobile station location, and interference levels. The system continuously adapts its radiation pattern and beam directions to maintain optimal signal quality while providing omnidirectional coverage, rather than using a fixed omnidirectional pattern.
2Reliability
If strict separation between base stations is enforced to avoid self-interference, then signal quality is improved, but system capacity deteriorates
Solution Approach 1:
The patent converts the harmful interference from adjacent base stations into a beneficial signal by using smart antenna beamforming to selectively receive signals from the desired base station while nulling out interference from other directions. The system processes signals from multiple base stations simultaneously on the same frequency by exploiting spatial separation, turning what would be harmful interference into usable signal energy through constructive interference in the desired direction and destructive interference in interference directions.
Solution Approach 2:
The patent adds the spatial dimension to frequency and time separation by using smart antenna technology to separate signals in the spatial domain. Instead of relying solely on frequency or time division, the system uses multiple antenna elements to create directional beams that can distinguish between signals from different base stations in different spatial locations, enabling simultaneous operation on the same frequency without interference.
3Device complexity
If omnidirectional antennas are used without smart antenna technology, then device complexity is reduced, but coverage and signal quality deteriorate in the presence of interference
Solution Approach 1:
The patent applies segmentation by dividing the antenna system into multiple discrete antenna elements that can be independently controlled and weighted. Instead of a single omnidirectional antenna, the system uses multiple elements that can be individually adjusted to create directional beams or omnidirectional patterns, providing flexibility to adapt to different operational conditions while maintaining manageable complexity through modular architecture.
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 different channels and different beams, said smart antenna system comprising a control subsystem, a radio transceiver and an antenna subsystem coupled to each other and adapted to perform scanning of different combinations of base stations, channels and beams using one or more test links established with one or more of said different fixed base stations, said one or more test links using at least some of the different channels and the different beams, select a first combination of base station, channel and beam based on the scanning, and establish a first operating link for transmitting a wireless signal to the selected base station using the selected channel and beam.