Electrical Wiring Residential
Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Chapter 23.1, Problem 11R

Receptacle outlets furnished as part of a permanently installed electric baseboard heater, when not connected to the heater’s branch circuit, (may) (may not) be counted as the required receptacle outlet for the space occupied by the baseboard heater. Electric baseboard heaters (shall) (shall not) be installed beneath wall receptacle outlets unless the instructions furnished with the heaters indicate that it is acceptable to install the heater below a receptacle outlet. (Circle the correct answers.)

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1. The communication channel bandwidth is 25 MHz centered at 1GHz and has a noise power spectral density of 10^-9 W/Hz. The channel loss between the transmitter and receiver is 25dB. The application requires a bit rate of 200Mbps and BER of less than 10^-4. Excluding Mary FSK, Determine the minimum transmit power required.
2. An existing system uses noncoherent BASK. The application requires a BER of <10^-5. The current transmit power is 25 Watts. If the system changes to a coherent BPSK modulation scheme, what is the new transmit power required to deliver the same BER?
3. You are to design a 9-volt battery operated communication system that must last 3 years without replacing batteries. The communication channel bandwidth is 100 KHz centered at 5.8 GHz. The application requires a BER of <10^-5 and a data rate of 1 Mbps. The channel can be modeled as AWGN with a noise power spectral density of 10^-8 W/Hz. ((a) What modulation scheme would you use? B) what is the required capacity of the batteries? and (c) is the battery commercially available?
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