What is subcarrier spacing

Subcarrier spacing is equal to the reciprocal of the symbol time. As a result of the longer symbol time, the subcarrier size and spacing decreases from 312.5 KHz to 78.125 KHz. The narrow subcarrier spacing allows better equalization and therefore enhanced channel robustness.

1. What is subcarrier spacing in LTE?
2. Why different subcarrier spacing in 5G?
3. Why subcarrier spacing is 15 KHz in LTE?
4. What is SCS in 5G?

What is subcarrier spacing in LTE?

In LTE, each subcarrier is spaced 15 kHz apart. These subcarriers are combined in groups of 12 to form a single resource block. Each resource block is used in an OFDMA arrangement to send data to different handsets or combined for high-speed data.

Why different subcarrier spacing in 5G?

Wider subcarrier spacing would provide better resistance to such increased Doppler shifts at higher frequency bands. Furthermore, 5G NR provides a flexible solution to support various applications by choosing an appropriate configuration. For example, when higher Δf is used, it results in a shorter slot duration.

Why subcarrier spacing is 15 KHz in LTE?

Simply, It is because 3G and LTE have the same clock timing for multi technology handsets.

What is SCS in 5G?

Numerology / SCS (Subcarrier Spacing)

Numerology in 5G/NR refers to Sub Carrier Spacing (SCS). As of Release 17, there are 7 types of numberology (SCS 15, 30, 60, 120, 240, 480, 960 Khz).