Publications by authors named "Kwang Seon Kim"
Article Synopsis
- A delta-sigma-modulated intermediate-frequency-over-fiber (IFoF) transmission system is introduced, utilizing a correlative-level coding technique to enhance performance.
- This system differs from traditional methods by using a second modulator to compress bandwidth and create correlations between signal symbols, which helps to improve signal quality.
- Experimental data shows that this new approach significantly increases transmission capacity by at least 40% for similar signal quality, outperforming conventional four-level systems in average error vector magnitude (EVM) by 2.1%.
A multiplexed Cassegrain reflector antenna with a 2 × 2 open-ended rectangular waveguide (OERW) matrix feed and an orbital angular momentum (OAM) mode mux is proposed for the simultaneous generation of three OAM modes (l = 0, ±1). The OAM mode mux (OMM) was designed using sequential combinations of quadrature hybrids, crossovers, and phase shifters to multiplex and demultiplex three OAM modes at the same time. The 2 × 2 OERW matrix feed and the OMM were separately measured and their performances were verified according to proposed theories.
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