EBK ELECTRIC MOTOR CONTROL
EBK ELECTRIC MOTOR CONTROL
10th Edition
ISBN: 9780100784598
Author: Herman
Publisher: YUZU
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Chapter 33, Problem 6SQ

When is it most important to use decelerating relays for multispeed installations?

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1. The communication channel bandwidth uses is 25 MHz centered at 1GHz and uses BPSK. The noise power spectral density of the channel is 10^-9 W/Hz. The channel loss between the transmitter and receiver is 25dB. The application requires a BER of less than 10^-4. Determine the minimum transmit power required.
4. A differential BPSK transmitter consumes 10 W and provides a BER of 1*10^-7. If the system moves to 16-QAM, what is new minimum transmit power?
5. The noise power (in watts) measured in a 40MHz Wifi channel is 230*10^-6 Watts. The access point (AP) output power is 600 mW and only uses 256QAM and has a data rate of 400Mbps. The channel losses can be modeled as 0.4dB/meter. An application on your phone requires a BER of < than 1*10^-4. A) What is the maximum distance between the AP and your phone? b) if the AP and my phone could switch to 64QAM and support the same data rate, what is the new maximum distance between the AP and my phone?
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