Distributed Base Station MIMO Beamforming Interference Control
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Solution Overview
Problem
The system capacity in distributed MIMO channel-based mobile communication systems is restricted due to severe interference between mobile stations using the same wireless channel resources, especially in environments with strong spatial correlation, limiting the coverage and efficiency of future mobile communication systems.
Innovation Solution
A distributed base station with multiple antenna-RF processing units and a central processing unit that employs MIMO coding, beam-forming, and overlapping techniques to create directional beams for multiple mobile stations, allowing simultaneous use of the same channel resources while minimizing interference through SDMA multiple access mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If distributed structure is introduced to improve system coverage, then coverage area is improved, but interference between mobile stations increases
Solution Approach 1:
The base station is segmented into multiple distributed antenna-RF processing units (AP1, AP2, AP3) located at different positions. Each antenna unit independently processes signals for mobile stations in its coverage area, reducing mutual interference while maintaining overall system coverage through spatial distribution.
2Productivity
If multiple mobile stations use the same wireless channel resources, then system capacity is improved, but interference between mobile stations increases
Solution Approach 1:
A central processing unit acts as an intermediary that coordinates signal processing across multiple distributed antenna-RF units. It performs baseband processing and signal coordination to enable multiple mobile stations to simultaneously use the same wireless channel resources while managing interference through centralized control and beam-forming techniques.
Solution Approach 2:
Each antenna-RF processing unit is optimized for local signal processing and beam formation directed at specific mobile stations. The local quality of signal transmission is enhanced through directional beam-forming, allowing multiple stations to share channel resources with reduced mutual interference.
3Productivity
If MIMO technology is applied to enhance system capacity, then transmission rate is improved, but performance decreases in environments with strong spatial correlation
Solution Approach 1:
The patent transitions from traditional co-located MIMO antennas to a distributed spatial dimension where antenna units are separated across different locations. This spatial dimensionality change creates independent fading channels even in line-of-sight environments, maintaining MIMO performance by exploiting geographic separation to reduce spatial correlation between antenna elements.
Data Source
AI summary
The present invention discloses a distributed base station serving mobile stations, which comprises multiple antenna-RF processing units and a central processing unit remotely connected with said multiple antenna-RF processing units. Each of the antenna-RF processing units has an antenna array formed by multiple antennas. Said central processing unit comprises: an MIMO coding unit for MIMO coding of data of each of the mobile stations so that data of each of the mobile stations generates multi-path data symbols; a beam-forming unit for multiplying each path data symbol of the multi-path data symbols of each of the mobile stations by a weighted coefficient vector corresponding to this path data symbol, to obtain beam-forming data of each path data symbol of each of the mobile stations; and an overlapping unit for, with respect to each antenna in said antenna-RF processing units, overlapping beam-forming data of the respective mobile stations for this antenna and feeding the overlapped beam-forming data to this antenna for transmission. The present invention further discloses a communication system having the above distributed base station and the corresponding signal transmission method.