Orthogonal Chirp-Division Multiplexing for Performance Enhanced Optical/Millimeter-Wave 5G/6G Communications

Abstract

Orthogonal chirp-division multiplexing is deployed as a novel waveform in an optical/millimeter-wave system. Enhanced channel estimation gives a 5-dB receiver sensitivity improvement over a conventional OFDM implementation, and compatibility with 256-QAM at 60-GHz is experimentally demonstrated.

Single chip silicon single sideband modulator with high sideband suppression ratio

“…Optical single sideband (OSSB) modulation is defined that one of the double sidebands (DSB) is remained and the other one is suppressed after lightwave being modulated by microwave. The anti-dispersion property of OSSB is significant to overcome the power fading effect in the dispersive radio over fiber (RoF) link, such as multistatic radar and 5G/6G wireless communication systems 1,2 . Additionally, the frequency shift of OSSB has been paid much attention in some frontier researches.…”

Transceiver Design for 6G Compatible CP-less Multi-User Orthogonal Chirp Division Multiplexing System with Physical Layer Security

“…For the prospective 6G applications, it can provide high-frequency and high-speed mobile communications using millimeter wave (mmWave) and terahertz frequency bands. A transmission chain consisting of a discrete Fourier transform (DFT) matrix, multiplied by a chirp, and finally an inverse DFT (IDFT) can form the OCDM signal [3][4][5]. To optimize spectral efficiency, the OCDM spread spectrum method makes use of the orthogonality of circularly altered linear chirp signals.…”

Concept of a photon spatial switch based on an off-axis zone plate: experimental confirmation in the millimeter waves range

“…Коэффициент преломления материала, по литературным данным, составлял n ≈ 1,59 [11] и мог корректироваться выбором плотности 3D-печати [12]. Следует заметить, что при таких геометрических параметрах мезоразмерной ФП параметр размера Миструктуры составлял величину q = πD / λ = 31π (Dдиаметр ФП), что соответствует условию существования эффекта фотонной струи [13] на границе с пределом геометрической оптики. В качестве детектора ММ-излучения использовался пироэлектрический фотоприёмник на основе тетрааминодифенила с расширенным диапазоном спектральной чувствительности (0,4 -3000 мкм) производства НПО «ВОСТОК», г. Новосибирск, внешний вид которого показан на рис.…”