Lens Antenna Spatial Modulation Transmitter for Interference Reduction
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Solution Overview
Problem
Existing spatial modulation (SM) systems applied to non-orthogonal multiple access (NOMA) systems in conventional antenna structures face reduced channel capacity due to inter-antenna interference and limited simultaneous transmission capabilities, which hinders the achievement of high MIMO gains.
Innovation Solution
The integration of a lens antenna structure with multiple antenna units, where the lens structure shifts the phase of electromagnetic waves, reducing the correlation between antenna radiation patterns and enhancing channel capacity by allowing distinct radiation patterns for each unit antenna, thereby supporting high channel capacity and mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple antennas are integrated in a limited space using conventional antenna structures, then antenna integration density increases, but inter-antenna interference increases and channel capacity decreases
Solution Approach 1:
The patent applies local quality by designing each antenna unit with a specific radiation pattern characteristic. The lens structure is positioned at different locations for different antenna units, creating locally distinct radiation patterns. This allows each antenna to have differentiated local properties (radiation characteristics) while being part of an integrated array, thereby reducing mutual interference and enabling higher integration density without proportional increase in interference.
2Productivity
If antennas are closely integrated to increase MIMO gain, then channel capacity may increase, but radiation pattern correlation between antennas increases reducing channel independence
Solution Approach 1:
The patent employs asymmetry by deliberately designing antenna units with non-uniform, differentiated radiation patterns through strategic lens positioning. Rather than using identical symmetric patterns, each antenna unit has an asymmetric radiation characteristic determined by its specific lens location. This asymmetry ensures that even when antennas are closely integrated, their radiation patterns remain sufficiently differentiated to maintain channel independence and enable effective MIMO operation.
3Device complexity
If conventional antenna structures are used in SM systems, then system complexity remains low, but the ability to support high channel capacity and mobility is limited
Solution Approach 1:
The patent introduces the lens structure as an intermediary element between the antenna units and free space. This intermediary component modifies the radiation patterns of the antenna units by refracting electromagnetic waves, thereby creating differentiated beam characteristics without requiring complex antenna element designs. The lens acts as a passive mediator that transforms simple antenna structures into high-performance spatial modulators, supporting enhanced channel capacity and mobility while keeping the overall system complexity manageable.
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 maintains high channel capacity while reducing interference between antennas, enabling efficient multiple-input multiple-output (MIMO) communication and supporting terminal mobility by optimizing antenna grouping and beamforming techniques.
Implementation Method 1
a lens structure which shifts a phase of an electromagnetic wave output by at least one of the plurality of antenna units
Implementation Method 2
Each of the unit antennas includes a plurality of antenna units and a lens structure which shifts a phase of an electromagnetic wave
Data Source
AI summary
Disclosed are a spatial modulation-based transmitter and communication method employing a lens antenna. The spatial modulation-based transmitter includes a plurality of unit antennas, a modulator configured to perform non-orthogonal multiple access and spatial modulation for an input signal, and a controller configured to determine a target unit antenna which will transmit data in a spatial modulation manner at a current time point among the plurality of unit antennas. Each of the unit antennas includes a plurality of antenna units and a lens structure which shifts a phase of an electromagnetic wave output by at least one of the plurality of antenna units. The lens structure shifts the phase so that the plurality of antenna units may have different radiation patterns.