Modal Antenna Diversity for Mobile Systems
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Solution Overview
Problem
Conventional antenna diversity schemes require multiple antennas, which increase volume, area, and power consumption, and are inefficient in multipath environments due to interference and signal degradation.
Innovation Solution
The use of a modal antenna capable of generating multiple radiation patterns, allowing for dynamic mode selection based on predicted Channel Quality Indicators (CQI) values using a modal cognitive diversity method, which reduces the need for multiple antennas and improves signal quality by steering the beam to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antenna diversity schemes use multiple antennas, then signal quality and reliability are improved, but device volume, area, and power consumption increase
Solution Approach 1:
The patent implements a single antenna system that can dynamically switch between multiple radiation patterns (omnidirectional, sector, directional) to perform the functions traditionally requiring multiple antennas. The antenna structure includes multiple feed points and switching mechanisms that enable one antenna to universally provide diverse radiation characteristics, eliminating the need for multiple physical antennas while maintaining signal quality and reliability.
2Reliability
If conventional antenna diversity schemes use multiple antennas, then signal quality and reliability are improved, but power consumption increases
Solution Approach 1:
The system uses a single antenna with multiple feed points and switching circuitry to provide diverse radiation patterns, eliminating the need to power multiple separate antenna systems. The switching mechanism activates only the necessary feed points based on current communication requirements, reducing overall power consumption while maintaining signal quality through dynamic pattern selection.
3Power
If multiple co-located antennas are used for pattern diversity, then directional beam capability and gain are improved, but device area increases
Solution Approach 1:
The patent segments a single antenna into multiple functional feed points (first feed point, second feed point, etc.) that can be independently controlled. Each feed point can be activated to create specific radiation patterns, providing directional beam capability and gain without requiring multiple physical antennas occupying separate areas. The segmented feed points share the same physical antenna structure, minimizing area requirements.
4Object-affected harmful factors
If antenna switching and combining techniques are implemented, then interference mitigation is improved, but device complexity increases
Solution Approach 1:
The system implements dynamic switching between different radiation patterns based on real-time communication conditions. The antenna switching mechanism adapts its configuration to mitigate interference by selecting appropriate beam directions and patterns, providing interference mitigation through dynamic reconfiguration rather than complex processing of multiple simultaneous signals. This reduces device complexity by using temporal switching instead of parallel signal processing.
Data Source
AI summary
A system and method for antenna diversity in a communication system are provided, the system including multiple antennas, including at least one modal antenna, wherein each of the at least one modal antenna has multiple modes corresponding to multiple radiation patterns, and a processor coupled to the multiple antennas and configured to select a mode among the multiple modes to optimize signal quality for each time interval based on a CQI.