What is the effective Temperature (T. (K) for a system with a 28 dB input SNR...
What are the (a) noise figure, (b) noise factor, and (c) effective temperature (Te) for a system with a 16 dB input SNR and a 12 dB output SNR?
The effective noise temperature of a radio receiving system before the demodulator is 800K. If the modulation employed is DSB-SC, what is the required received power level if an 85 dB SNR at the demodulator output is required. Assume the bandwidth of m(t) is 7 kHz. 4.
2. 12 pts] An FM system has a modulation index β-6 aid the input signal-to-noise ratio SNR 25dB. The message is a periodic square wave given in the figure below pulse width -0.2m 2 0 0 t (ms) a) What is the output SNR.? b) What is the proper value of the message bandwidth? [Justify your answer. c) What is the corresponding FM transmission bandwidth? d) If the modulation index is kept at β 6, what should be the increase...
3. The quality of a received signal is often characterized by the signal-to-noise-ratio (SNR), which is defined as SNR 10 log As you might expect from this Signal power in watts KTB definition, the unit of SNR is decibels (dB). The term in the denominator is the noise power, and it is generally specified as an effective noise temperature T multiplied by the product of Boltzmann's constant (K) and the bandwidth (B) of the signal in Hz. Generally we like...
Problem 1 A sinusodial signal x(t)- sin2t (t in seconds) is input to a system with frequency response: H(G What signal y(t) is observed at the output? Problem 2 The inverse Fourier transform of a system frequency response is given by h(t)t. The signal x(t) 3 cos(4t 0.5) is input to the system (t in seconds). (a) What is the expression of the signal y(t) at the system output? (b) What is the power attenuation in dB caused by the...
Problem 3 A receiver has a bandwidth of 1 MHz and a noise figure of 10 dB. The receiver sensitivity is -90 dBm. The Boltzmann constant is k=1.38x10-23 Joule/deg K, and the room temperature is 300 deg Kelvin. a) What is the ratio of the SNR at the input to the receiver (computed over the bandwidth of interest) to the SNR at the output of the receiver? b) What is the noise power at output of the receiver? c) Find...
Q.2 ICO2]10 Marks] The signal g(t) forms the input to the LPF circuit shown in the figure, where R l,and y(Dis the output. If the power spectral density (PSD) of the signal ge) is (a) The autocorrelation of g(t) (b) The 3-dB bandwidth of the LPF (c) The power of g(t) and y(t) (d) Based on your answers above, will it be better if the signal has more or less bandwith? (e) If a white noise of PSD No/2 is...
Problem #2: (40 points) Consider the following communication link. Both the transmitter and receivers are properly matched to their respective antennas. Assume that the system nominal temperature is 290 K. A detailed block diagram of the receiver is shown in the figure Determine 1. The effective isotropic radiated power in dBm. 2. The space loss in dB 3. The communication link total losses in dB 4. What would be the received power at the receiver input in dBm? 5. What's...
Problem 5. Consider the dynamics of two mass mechanical system captured by d2xi(t) Middt?t2+k(x1(t)-x2(t)) = f(t) d'x2(t) dt2 + k(x2(t)-x where M, , M2, and k are constants. Suppose the input is () and the output is X2 (t), find the transfer function G(s) of the system. Note: Consider all zero initial conditions.
g) The Bode magnitude plot of a system is given below (note gains are in dB scale). What are the five (approximate) amplitudes of the sinusoidal outputs if the inputs are u(t) = sin(w t) (i.e. input amplitude is 1) where w are respectively: i) 0.1 rad/s; ii) 2.1 rad/s; iii) 3 rad/s; iv) 4.3 rad/s; v) 10 rad/s. Magnitude gain - dB 10 100 Frequency - [rad/s]