Introduction to 5G Network Engineering - Unit 5: 5G New Radio – Physical Principles
The physical principles of the 5G NR build on those of 4G E-UTRA in order to support a much more flexible system. In this unit, modulation and OFDMA (Orthogonal Frequency Multiple Access) are reviewed, before the specifics of the 5G NR are set out, including the adjustable subcarrier spacing and “numerologies”, an additional protocol introduced into the air interface protocol stack, the physical layer architecture, and 5G frequency bands.
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• List and briefly describe the key foundational principles for the 5G New Radio
• Discuss the ways in which sub-carrier spacing can be optimised to balance inter-symbol interference and doppler effects at different frequencies and for different radio environments (including cell size)
• Draw a simple diagram to illustrate both the Physical Layer architecture and the Air Interface Protocol stack
• Relate the 5G frequency bands to the standardised OFDM numerologies