OAM Beam Multiplexing for Wireless Capacity
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Solution Overview
Problem
Current mobile communication systems face challenges in supporting explosive data traffic, high data rates, numerous connected devices, low latency, and energy efficiency due to resource shortages and increased demand for higher speed services.
Innovation Solution
The method involves transmitting and receiving detectable orbital angular momentum (OAM) states in a wireless communication system using a precoding matrix or codebook, specifically with an antenna array forming a right-hand circular polarized beam, to maximize multiplexing gain and improve communication capacity in the THz band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional wireless communication methods are used, then system simplicity is maintained, but communication capacity and data rate cannot support explosive data traffic growth
Solution Approach 1:
The patent introduces orbital angular momentum (OAM) modes as an additional dimension for signal differentiation. By utilizing different OAM modes (e.g., l=0, l=1, l=-1) in addition to traditional spatial dimensions, the system can multiplex multiple data streams simultaneously, dramatically increasing communication capacity without proportionally increasing system complexity
Solution Approach 2:
The patent changes the fundamental parameter used for signal differentiation from traditional spatial parameters (antenna position, beam direction) to include OAM mode parameters. This parameter expansion allows the system to distinguish and multiplex multiple signals using different OAM states, thereby increasing productivity while managing complexity through parameter-based differentiation
2Productivity
If more resources are allocated to support higher data rates and more connected devices, then service quality improves, but resource shortage and energy consumption worsen
Solution Approach 1:
By adding OAM mode dimension to the communication system, multiple data streams can be transmitted through the same physical channel and frequency resources. This enables higher data rates without requiring additional physical resources or increasing energy consumption proportionally, thus improving productivity while maintaining energy efficiency
3Productivity
If traditional antenna arrays are used, then device complexity is low, but multiplexing gain and communication capacity are limited
Solution Approach 1:
The patent extends the traditional two-dimensional antenna array concept by incorporating OAM mode dimension. The antenna array is configured to generate and detect specific OAM modes, creating a three-dimensional signal space (spatial position × OAM mode). This enables higher multiplexing gain by distinguishing signals not only by their spatial origin but also by their OAM characteristics
Solution Approach 2:
The patent modifies the antenna array operation to control and detect OAM mode parameters. By adjusting the phase and amplitude distribution across antenna elements, the system can generate specific OAM modes and differentiate incoming signals based on their OAM characteristics, thereby increasing multiplexing capability
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 communication capacity and beamforming performance by effectively utilizing OAM states, addressing the limitations of existing systems in handling high data traffic and latency while improving energy efficiency.
Implementation Method 1
Method of using orbital angular momentum in a wireless communication system
Implementation Method 2
the right-hand circular polarized beam may be a beam having spin angular momentum (SAM)=−1
Data Source
AI summary
The present disclosure proposes a method using orbital angular momentum (OAM) and an apparatus therefor. The method performed by a UE may include receiving, from a base station, information for an OAM state set, wherein the OAM state set includes multiple OAM state subsets, and each of the multiple OAM state subsets includes one or two or more OAM states, receiving at least one OAM beam from the base station, determining a detectable at least one OAM state based on the at least one OAM beam, and transmitting, to the base station, information for an OAM state subset including the at least one OAM state within the OAM state set.