1. In Slides ch1/page 17-18, we discussed some "new" and trends in wireless applications, such as those inspired by the advancements of machine-to- machine communications. Can you mention three wireless applications? Do you have an innovative idea for a new application? If yes, can you share it. 2. Differentiate between licensed and unlicensed wireless spectrum. 3. Differentiate between an analog and a digital electromagnetic signal. 4. What are three important characteristics of a periodic signal? 5. What is attenuation? How does it affect the signal at the received end? 6. Define channel capacity. 7. What key factors affect channel capacity? 8. A signal has a fundamental frequency of 1000 Hz. What is its period? 9. If the solid curve in Figure 2.14 represents sin(2pt), what does the dotted curve represent? That is, the dotted curve can be written in the form A sin(2pft + f), what are A, f, and f? Figure 2.14 Figure for Problem 24 10. What is the channel capacity for a teleprinter channel with a 300-Hz bandwidth and a signal-to-noise ratio of 3 dB? 11. A digital signaling system is required to operate at 9600 bps. a. If a signal element encodes a 4-bit word, what is the minimum required bandwidth of the channel? b. Repeat part (a) for the case of 8-bit words. 12. Given a channel with an intended capacity of 20 Mbps, the bandwidth of the channel is 3 MHz. What signal-to-noise ratio is required to achieve this capacity? 29/01/2020