Consider the FM radio frequencies between 89 and 93 MHz. (Remember that the bandwidth of an FM radio station is 200 KHz.)  Seven Orlando stations operate in this range:

WLAZ	WPIO	WUCF	WMFE	WKES	WPRK	WWKA
89.1 FM	89.3 FM	89.9 FM	90.7 FM	91.1 FM	91.5 FM	92.3 FM

a) What are the smallest and largest frequencies transmitted by WKES FM? 

b) How many more FM radio stations can operate in this same area, in the 89-93 MHz frequency range?  Why? 

c) If the entire bandwidth of one of these stations was used to transmit data in a noiseless channel with eight signal levels, according to Nyquist bit rate formula, what would be that channel's bit rate?

Question 2

A periodic composite signal contains sine harmonics with frequencies from 6 KHz to 54 KHz. All harmonics from 6-54 KHz, i.e.,  6 KHz, 12 KHz, 18 KHz, 24 KHz, 30 KHz, 36 KHz, 42 KHz, 48 KHz, and 54 KHz, are included in the signal.

The signal is transmitted over a channel that has attenuation of -(infinity) dB for frequencies less than or equal to 18 KHz, and -4 dB for all frequencies greater than 18 KHz.

All harmonics have a maximum power of 60 mW at the sender's side of the channel. Recall the attenuation formulae is dB = 10 log₁₀ (P₂/P₁).

a) How many harmonics reach the receiver? 

b) What is their maximum power when received? 

c) What is the bandwidth of the signal as sent? 

d) What is the bandwidth of the signal as received?

Question 3 (4 points)

Consider a mesh network connecting n devices.

a) The total number of cables in the network is 55.  What is n? 

b) The link connecting two given devices has a bandwidth of 12 KHz and an SNR (signal-to-noise ratio) of 37. According to Shannon capacity formula, please calculate the theoretical capacity of this channel. 

c) A sender S transmits fixed-length packets to a receiver R over a link in the network at 100 Kbps. The one-way propagation delay is 100ms.  How much traffic, measured in bits, fills this link at a given time?

Answer rating: 100% (QA)

a WKES FM operates within the FM radio frequency range of 8993 MHz The smallest and largest frequencies transmitted by WKES FM are Smallest Frequency 891 MHz Largest Frequency 891 MHz 02 MHz 893 MHz b ... View the full answer