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Q. Illustrate Frequency-shift keying?
Digital transmission by FSK is a nonlinear modulation method that is appropriate for channels that lack the phase stability needed to perform carrier-phase estimation. Figure shows the functions of a coherent FSK system in which the transmitted signal sFSK(t) is generated by frequency modulation of a voltage-controlled oscillator (VCO). The digital signal d(t) has a polar format with amplitudes ±1, corresponding to binary digits 1 and 0, respectively.Modulation keys the VCO's angular frequency between two values, such that
where ω is the frequency deviation from a nominal or carrier angular frequency ωc. In order to conserve the bandwidth in the signal sFSK(t), ω is usually selected not much larger than the minimum allowable value given by
When Equation is satisfied, the bandwidth of the channel needed to support sFSK(t)is about 2ωb rad/s. The transmitted signal in Figure can be seen to be two unipolar ASK signals in parallel, one at carrier frequency ω2 and the other at ω1. The receiver then becomes two coherent ASK receivers in parallel.
The noncoherent FSK version results when each product device and the following integrator in the receiver are replaced by a corresponding matched filter followed by an envelope detector.
detail note on non biased
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see figure on this link: http://tinypic.com/r/1zodevk/8. A. j400 I1-j1200 I2 (A) B. -j400 I1+j1600 I2 (A) C. j400 I1+j400 I2 (A) D. -j400 I1-j400 I2 (A)
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You have been given a DC motor to characterize. What three measurements are required in order to develop the torque-speed curve and the acceleration curve for the unloaded motor?
different coupling methods
Assignment 2: FIR Filters in Audio Processing This assignment will focus on the filtering of audio signals using FIR filters. Audio signal processing uses many types of digital f
Q. Draw the circuit of a 7805 voltage regulator? Explain the functions of the capacitors used at its input and output sides. Functions of capacitors used at input and outp
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