Why is the OFDM Symbol Prefix Shorter in 5G Mobile and 802.11ac WiFi?

Explains the two main reasons why the symbol prefix is shorted in the new 5G mobile cellular standard and also in the 802.11ac and 802.11ax WiFi standards, compared to the previous 4G and 802.11a standards. Related videos: (see: http://iaincollings.com) • Why is Subcarrier Spacing Bigger in 5G Mobile Communications? https://youtu.be/uyDvjpPn8ms • How are OFDM Sub Carrier Spacing and Time Samples Related? https://youtu.be/knjeXo3VZvc • What is SC-FDMA? And why is it used for the Uplink of 4G/5G Mobile? https://youtu.be/ODx7mDCjDwQ • Why is SC-FDMA called "Single Carrier"? https://youtu.be/Zf1SL6R99fQ • What is Multi-User MIMO Communications (MU MIMO)? https://youtu.be/0ncIWlhsu1A • What is MIMO OFDM? https://youtu.be/kaPK58WlG-A • OFDM and the DFT https://youtu.be/Z4LIgNgNAlI • What is a Cyclic Prefix in OFDM? https://youtu.be/AJg57AEBtNw • How does OFDM Overcome ISI? https://youtu.be/xcQ6rtIXv6M • Modelling mmWave MIMO Channels https://youtu.be/bLEcdPINziM • What are Doppler Shift, Doppler Spread, and Doppler Spectrum? https://youtu.be/LLr3-kotbz4 • What are Flat Fading and Frequency Selective Fading? https://youtu.be/KiKPFT4rtHg Full categorised list of videos with pdf Summary Sheets: http://iaincollings.com