RF Switch Circuit for Dynamic Antenna Coupling in Distributed MIMO
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Solution Overview
Problem
Current distributed communications systems (DCS) face challenges in optimizing wireless data capacity and signal strength due to limitations in antenna activation and channel quality management, particularly in supporting massive multiple-input multiple-output (MIMO) configurations.
Innovation Solution
The implementation of a DCS with remote units equipped with more antennas than RF chains, where an RF switch circuit dynamically couples RF chains to a subset of antennas based on user equipment locations, allowing for concurrent radiation and absorption of RF signals, thereby optimizing signal strength and channel quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antennas is increased to support massive MIMO configurations, then wireless data capacity and signal strength are improved, but system complexity and hardware cost increase
Solution Approach 1:
The patent divides the antenna array into multiple groups, with each group associated with a separate RF chain. This segmentation allows the system to manage a large number of antennas (e.g., 64 or 128) by organizing them into smaller, independently controllable subsets, thereby reducing the complexity of signal processing and resource management while maintaining the productivity benefits of massive MIMO
Solution Approach 2:
The patent implements dynamic antenna selection and activation based on channel conditions, user equipment locations, and traffic demands. The system can dynamically activate or deactivate specific antenna groups and adjust the number of active RF chains in real-time, allowing the system to adapt its complexity level to match current performance requirements, thus improving productivity without permanently increasing system complexity
2Reliability
If more antennas are activated to improve signal strength and channel quality, then communication reliability is improved, but energy consumption increases
Solution Approach 1:
The patent activates only the necessary number of antenna groups and RF chains required to meet current communication demands, rather than keeping all antennas continuously active. By using partial action (activating a subset) or excessive action (activating more than minimum but optimizing the balance), the system maintains communication reliability while significantly reducing energy consumption compared to full-array operation
Solution Approach 2:
The system periodically evaluates channel conditions, user locations, and traffic patterns to dynamically adjust which antenna groups are active. This periodic reassessment allows the system to switch between different antenna configurations based on current needs, maintaining reliability when required while conserving energy during periods of lower demand or favorable channel conditions
3Productivity
If the number of RF chains is increased to support more simultaneous signal streams, then system performance is improved, but hardware cost and device complexity increase
Solution Approach 1:
The patent designs each antenna group to be multi-functional, capable of serving multiple purposes: transmission, reception, beamforming, and spatial multiplexing. By making antenna groups universal in their functionality, the system can achieve high signal stream capacity with fewer RF chains, as each activated antenna group can handle multiple communication tasks simultaneously, reducing the need for dedicated hardware for each function
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 approach enhances wireless data capacity with negligible additional hardware cost, improves energy efficiency, and provides better system performance reliability through better antenna diversity and intelligent system monitoring.
Implementation Method 1
a subset of the plurality of antennas is activated to concurrently radiate the plurality of downlink RF communications signals
Implementation Method 2
an RF switch circuit is configured to couple the plurality of RF chains to a subset of the plurality of antennas in accordance to a plurality of user equipment locations
Data Source
AI summary
Supporting distributed massive multiple-input multiple-output (DM-MIMO) in a distributed communications system (DCS) is disclosed. The DCS includes multiple remote units each configured to communicate downlink and uplink radio frequency (RF) communications signals with a number of user equipment (UEs) at different UE locations in the DCS. Each remote unit includes multiple antennas, multiple RF chains, and an RF switch circuit configured to dynamically couple the RF chains to a subset of antennas in accordance to the UE locations such that the subset of antennas can be activated to concurrently radiate the downlink RF communications signals and absorb the uplink RF communications signals. By dynamically activating the subset of antennas in accordance to the UE locations, it is possible to optimize signal strength and channel quality for each UE in the DCS, thus making it possible to improve wireless data capacity of the DCS with negligible additional hardware cost.