Outdoor-Indoor MIMO Repeater Antenna Segmentation
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Solution Overview
Problem
Existing outdoor-indoor MIMO communication systems face challenges in providing efficient indoor coverage with high bit-rate and spectral efficiency due to penetration loss through building walls and limited spatial separation of repeater antennas, leading to high correlation and power imbalances.
Innovation Solution
A wireless outdoor-indoor MIMO communication system utilizing multiple repeaters with well-separated antennas and distributed antenna systems (DAS) to achieve full rank MIMO channels and balanced power distribution, ensuring effective indoor coverage and high bit-rate communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If repeater antennas are co-located to simplify deployment, then device complexity is reduced, but MIMO channel rank is limited due to high correlation between antennas
Solution Approach 1:
The system segments the repeater functionality by separating pick-up antennas (outdoor) from donor antennas (indoor), allowing them to be independently deployed and optimized. This segmentation enables spatial separation between antenna elements while maintaining system integration through the repeater unit, thereby achieving higher MIMO channel rank without excessive deployment complexity.
Solution Approach 2:
The patent transitions from a two-dimensional co-located antenna arrangement to a three-dimensional distributed arrangement where pick-up antennas are positioned outdoors and donor antennas are positioned indoors at different locations. This dimensional change enables greater spatial separation between antenna elements, reducing correlation and increasing MIMO channel rank.
2Reliability
If pick-up antennas are placed in line of sight of base station to ensure good link quality, then signal strength is improved, but spatial separation between repeater antennas becomes difficult to achieve
Solution Approach 1:
By segmenting the repeater into outdoor pick-up antenna components and indoor donor antenna components, the system can position pick-up antennas in optimal LOS locations outdoors while placing donor antennas at separated indoor locations, thus maintaining link quality while achieving spatial separation for higher MIMO rank.
Solution Approach 2:
The outdoor pick-up antenna acts as an intermediary that receives signals from the base station in LOS conditions and transfers them to the indoor donor antennas. This intermediary enables the system to maintain good link quality through LOS pick-up antennas while allowing spatially separated indoor donor antennas to provide high MIMO channel rank.
3Reliability
If donor antennas are non co-located to achieve spatial separation, then MIMO channel rank is improved, but power imbalance between donor antennas increases
Solution Approach 1:
The system applies local quality adjustment by configuring each indoor donor antenna with appropriate power levels and transmission parameters tailored to its specific location and coverage area. This allows spatially separated donor antennas to maintain power balance despite their different positions, ensuring uniform indoor coverage while preserving high MIMO channel rank.
Solution Approach 2:
The repeater system dynamically adjusts transmission parameters including power levels for each donor antenna based on real-time channel conditions and user equipment locations. This dynamic adaptation enables the system to maintain power balance between spatially separated donor antennas, optimizing both MIMO channel rank and coverage uniformity.
4Productivity
If multiple repeaters with well-separated antennas are deployed to achieve full rank MIMO channels, then spectral efficiency is improved, but device complexity and deployment difficulty increase
Solution Approach 1:
The system segments repeater functionality across multiple units with outdoor pick-up antennas and indoor donor antennas, enabling distributed deployment that achieves full-rank MIMO channels. This segmentation allows spectral efficiency improvement through multiple spatially separated antennas while managing complexity by using standardized modular repeater units.
Data Source
AI summary
The invention relates to a wireless outdoor-indoor multiple-input multiple-output (MIMO) communications system for communicating with user equipment located inside a physical structure such as a building. The MIMO communication system is comprised of a node having at least two node antennas, wherein the node is configured for line of sight (LOS) wireless MIMO communication with at least two outdoor-indoor repeaters, and of at least two outdoor-indoor repeaters adapted for LOS wireless MIMO communication with the node. The repeaters have at least one repeater antenna each, provided outside the physical structure, for LOS MIMO communication with the node and at least two DASs each, provided inside the physical structure, for indoor MIMO communication with the user equipment located inside the physical structure. The repeaters are provided outside on the same physical structure and spaced well-apart, and each DAS of each repeater is provided such that they provide the same indoor coverage of the same interior space in the physical structure.