1. A multipath channel includes five paths with powers 0.1, 0.01, 0.02, 0.001, and 0.5 W. The corresponding delays are 0.1, 0.2, 0.3, 0.4, and 0.5 µs, respectively. If the signal bandwidth is 200 kHz, is the channel flat or frequency selective?
2. A mobile is moving at a speed of 100 km/h. The transmitted frequency is 900 MHz while the signal bandwidth is 300 kHz. Is the channel slow or fast?