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4G LTE Essentials
LTE employs two distinct multiple access technologies to optimize performance in each direction. On the downlink the tower transmits to handsets using Orthogonal Frequency Division Multiple Access, which splits the available bandwidth into thousands of narrowly spaced 15 kHz subcarriers and assigns subsets of them to different users simultaneously. This approach is inherently resistant to multipath fading because each subcarrier experiences a flat channel even when the wideband channel is frequency selective. A cyclic prefix inserted before every OFDM symbol absorbs delayed reflections and…
Try these first, even if you're not sure. Guessing primes your brain.
A tower has wall power; a phone has a battery. Should both use the same radio scheme?
Echoes off buildings arrive slightly late. How do you keep them out of the next symbol?
A wide channel fades differently at different frequencies. How do you equalise it simply?
Answer all 3to continue — it's OK to be wrong.