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A new phone company wants to provide very cheap voice-only cell phone capability to 200,000 simultaneous users in San Francisco. They transmit only 8kbs per duplex channel using FDMA (frequency division multiple access) and BPSK (1 bit/Hz). The FCC mandates that they use 1kHz of guard band on each side of the channels.
a) For a system of 20 clusters, what total bandwidth do they ask the FCC for?
b) If they use a frequency reuse scheme of 12 per cluster, how many channels are there per cell?
Design a filter for a biomedical instrument to eliminate DC (f = 0), 500 Hz tone, and its corresponding harmonics. The system sampling rate is 2,000 Hz. Place all the required poles at the origin to obtain a FIR filter.
An incident wave of light travels through glass (n = 1.4) to water (n = 1.33) at an angle of 350. a. What is the angle of reflection and refraction b. What is the critical angle for this system
A signals values have a range of +- 5V and you wish to make measurements with an analog quantization size no mate thatn 5mV. What minimum resolution A/D converter is required to perform this risk
Parallel plate waveguide has plate seperation of 2cm, filled with dielectric material with an index refration of n=3, lenght of wavelengh guide z=50m opertaing at 10 Ghz. a) find the cutoff frequency
Devise a system that will convert this temperature range into an 8-bit digital word with conversion from 00H to 01H at 200°C and from FEH to FFH at 350°C . An ADC is available with a 2.500-V internal reference. At 200°C a type K TC produces 8.13 m..
Three point charges are positioned in the x-y plane as follows: 5 nC at y = 5 cm, -10 nC at y = -5 cm, and 15 nC at x = -5 cm. Find the required x-y coordinates of a 20-nC fourth charge that will produce a zero electric field at the origin.
Find the system transfer function of a causal LSI system whose impulse response is given byh[n] = (-0.5)^n-1 sin[0.5(n-2)]u[n-2] and express the result in positive powers of z. Hint: The transfer function is just the z-transform of impulse respon..
Wavelength and Frequency, The downstream information (from the network to the customer) is transmitted at a wavelength of 1550 nanometers and the upstream information
Design an ac-dc voltage converter based on half-wave rectification and filtering. The requirements are: 1. Choose the values of the load resistor R and the capacitor C so that the converter will have a ripple factor of 10%
The circuit will have as inputs a minimum of two inputs; the binary equivalent of two decimal numbers of not greater than (10,000)10. The circuit will also produce a minimum of two outputs, the quotient and the remainder.
Design an interface for a 12 V, 500 mA bipolar stepper motor. There are 200 steps per revolution. Write software to spin the motor at 1 rps.
in step index fiber the core of diameter D has a refractive n1, which is typically equal to 1.48. core is typically surrounded by the cladding of slightly lower index. Where n2=n1(1-delta). The parameter is simply called the index difference.
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