Extreme SCS

Technical Explanation

In 5G NR, Subcarrier Spacing (SCS) scaled from 15 kHz up to 120 kHz for FR2 mmWave. At Sub-THz frequencies (100-300 GHz), hardware oscillators experience extreme phase noise that destroys narrow subcarrier orthogonality. 6G introduces Extreme SCS numerology (scaling to 240 kHz, 480 kHz, 960 kHz, 1.92 MHz, and 3.84 MHz). This broad SCS shortens symbol duration to sub-microsecond levels, making the waveform immune to local oscillator phase noise.

Key Functions

• Robust immunity against high phase noise in Sub-THz radio frequency oscillators
• Sub-microsecond OFDM symbol durations supporting ultra-fast transmission time intervals (TTI)
• Scalable numerology spanning legacy Sub-6GHz (15/30 kHz) all the way to 300 GHz (3.84 MHz)
• Reduced latency for immediate physical layer HARQ acknowledgments
• Integration with single-carrier DFT-s-OFDM for superior power amplifier efficiency