Multicore Fiber MIMO Base Station Signal Processing
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing signal processing complexity and cost at base transceiver stations while enhancing coverage and capacity, particularly in deploying massive MIMO configurations.
Innovation Solution
The implementation of space division multiplexing (SDM) using multicore or multimode fibers to transmit radio-frequency signals from multiple antenna units to a central station, where signal processing can be centralized, reducing complexity and cost by using directly modulated lasers and wavelength division multiplexing, and employing tapered fiber couplers for efficient optical coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distributed antenna MIMO systems use the same radio frequency spectrum for several antennas to cooperatively detect signals, then reach and capacity of wireless signals are enhanced, but signal processing complexity increases
Solution Approach 1:
The patent extracts the signal processing function from distributed antenna units and relocates it to a centralized optical processing unit. Each antenna unit is simplified to only perform RF-to-optical conversion using directly modulated lasers, while the complex MIMO signal processing is performed centrally at the optical processing unit, thereby reducing complexity at the distributed units while maintaining enhanced wireless capacity
Solution Approach 2:
The patent transitions from traditional electrical signal transmission to optical domain transmission by converting RF signals to optical signals through directly modulated lasers. This dimensional change from electrical to optical domain enables simplified antenna units while maintaining the ability to perform complex MIMO processing through optical time division multiplexing and centralized optical processing
2Reliability
If each antenna is connected to the central station via a duplex fiber link, then reliable signal transmission is achieved, but the footprint of optical data links increases
Solution Approach 1:
The patent merges multiple separate fiber connections into a single multicore fiber link by combining signals from multiple antenna units into one optical fiber using optical time division multiplexing. This consolidation maintains reliable signal transmission for all antenna units while dramatically reducing the number of fiber cables required compared to individual duplex links for each antenna
Solution Approach 2:
The patent segments the optical signal into different time slots for different antenna units within a single fiber link. By using optical time division multiplexing, signals from multiple antennas are divided into distinct temporal segments that can be transmitted over the same physical fiber infrastructure, reducing fiber footprint while maintaining signal integrity
3Device complexity
If directly modulated lasers are used in antenna transceivers, then device complexity is reduced, but optical coupling efficiency may be compromised
Solution Approach 1:
The patent introduces optical circulators and isolators as intermediary components between directly modulated lasers and the optical fiber network. These passive optical components facilitate efficient optical coupling and signal routing without adding complexity to the antenna transceivers, enabling the use of simple directly modulated lasers while maintaining high optical coupling efficiency through proper optical path management
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 significantly reduces power consumption and cost at base transceiver stations, enhances spectral efficiency, and allows for scalable wireless communication systems by moving signal processing to the central station, enabling radical cost reductions and improved coverage in wireless transmission systems.
Implementation Method 1
an optical transmitter in the form of an electro-optic conversion unit for each of said plurality of antenna units, each electro-optic conversion unit adapted for converting an RF signal into an optical signal
Implementation Method 2
a plurality of a single core optical fibers for guiding the optical signals
Implementation Method 3
at least one first space division multiplexing (SDM) unit adapted for multiplexing said single core optical fibers into respective individual cores of at least one multicore fiber, or alternatively, into individual modes of at least one multimode optical fiber
Data Source
AI summary
The present disclosure relates to system applications of multicore optical fibers. One embodiment relates to a base transceiver station for a wireless telecommunication system comprising a plurality of antenna units arranged in a MIMO configuration and adapted for transmission and/or reception of radio-frequency signals, an optical transmitter in the form of an electro-optic conversion unit for each of said plurality of antenna units, each electro-optic conversion unit adapted for converting an RF signal into an optical signal, a plurality of a single core optical fibers for guiding the optical signals, and at least one first space division multiplexing (SDM) unit adapted for multiplexing said single core optical fibers into respective individual cores of a multicore fiber, or into respective individual modes of a multimode fiber.