Uplink Interference Removal in Stratospheric Wireless Communication
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Solution Overview
Problem
The challenge in providing wireless communication services from a flying body in the stratosphere is to mitigate uplink interference caused by the close arrangement of Remote Radio Heads (RRHs), which affects communication quality for user terminals on the ground.
Innovation Solution
The wireless communication device employs a Base Band Unit (BBU) with UL-CoMP (Uplink Coordinated Multi-Point) technique to identify and remove interference signals by synthesizing signals from multiple RRHs, using a target identifying unit to determine interference sources and performing removal processing to isolate clean signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple Remote Radio Heads (RRHs) are closely arranged to provide wireless communication services to multiple user terminals, then the coverage area and service capacity are improved, but uplink interference increases and communication quality deteriorates
Solution Approach 1:
The system segments the uplink signal reception by assigning different RRHs to receive signals from different user terminals. Each RRH is equipped with a target identifying unit that can identify and extract the desired signal from the composite received signal, effectively dividing the interference problem into manageable segments that can be processed independently.
Solution Approach 2:
The Base Band Unit (BBU) acts as an intermediary that coordinates between multiple RRHs. It collects signal information from multiple RRHs, performs joint signal processing, and reconstructs the desired signals by eliminating interference components. The BBU mediates the interaction between RRHs to achieve coordinated multi-point reception that suppresses uplink interference.
2Adaptability or versatility
If the flying body dynamically adjusts beam and cell configurations to maintain service quality, then the adaptability and service continuity are improved, but the system complexity and signal processing burden increase
Solution Approach 1:
The target identifying unit in each RRH performs preliminary signal identification and extraction before signals are combined at the BBU. By pre-processing signals to identify desired components and separate interference, the system reduces the processing burden at the BBU and enables faster adaptation to changing beam and cell configurations.
Solution Approach 2:
The system implements dynamic beam and cell configurations where RRHs can be dynamically assigned to different user terminals and frequency resources. The target identifying units dynamically adjust their signal processing parameters based on real-time channel conditions, enabling the system to adapt to changing environmental conditions while maintaining manageable complexity through localized decision-making.
Data Source
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AI summary
There is provided a wireless communication device configured to be mounted to a flying body, comprising: a plurality of radio units including a first radio unit and a second radio unit; and a control unit configured to control each of the plurality of radio units to form a cell, thereby forming the multi-cell on the ground, wherein the control unit has a removal processing performing unit configured to perform, based on a first reception radio wave in which the first radio unit received a first transmission radio wave which includes a first signal transmitted by a first user terminal located in an area of a first cell formed by the first radio unit, and a second reception radio wave in which the second radio unit received a second transmission radio wave which includes a second signal transmitted by a second user terminal located in an area of a second cell formed by the second radio unit, removal processing to remove a component of the first transmission radio wave contained as an interference wave in the second reception radio wave.