Assignment:
Consider a mobile wireless system, using QPSK modulation at 24.3 ksymbols/s, and a carrier frequency of 1900 MHz. What is the fastest speed in km/hr that is permissible for a vehicle using such a system, if it is required that the change in phase, AO, due to spectral broadening (Doppler spread) does not exceed 5°/symbol?
Provide complete and step by step solution for the question and show calculations and use formulas.