1. (50 points) A baseband binary message with a bit rate R₁ = 100 kbps is modulated by an RF carrier using BPSK. We assume that the coherence bandwidth is approximated by Bc ≈ 1 and the coherence time is estimated using 500 the popular rule of thumb for modern digital communications. a) Find the range of values required for the rms delay spread of the channel such that the channel is flat-fading. b) If the modulation carrier frequency is 5.8 GHz, what is the coherence time of the channel, assuming a vehicle speed of 30 miles per hour? c) For your answer in b), is the channel "fast" or "slow" fading? d) Given your answer in b), how many bits are sent while the channel appears "static"?

Fig: 1