GATE EC 2022:Communication System Quiz 7

Given a source having bit rate of 10 Mbps and 4 bits are required to represent symbol. The baud rate of communication is _________ symbols/sec

If the bandpass filter has bandwidth of 2w cantered at f_c and LPF has bandwidth of w, the band width of output signal will be,

Consider the system shown below .The average value of m(t) is zero and maximum value of |m(t)| is A_m. The square law device is designed as

y(t) = 4 x(t) + 10 x²(t)

Find the value of A_m , required to produce modulation index of 0.8 is______.

A low frequency signal of bandwidth 4 KHz having strength 0.001 watts is passed through a distorting channel defined as   and is also corrupted with AWGN with two sided PSD of 10^–8 W/Hz.

At the receiver side there is an equalizer which exactly matches the channel within frequency of message signal. The strength of the noise at the output of equalizer is

A signal can be modeled as a low pass stationary process X(t) whose probability Density function (Pdf) is given below:

The Bandwidth (BW) of the above process is 10 (kHz) and it is desired to transmit it using a PCM system.

If the sampling is done at the twice of Nyquist Rate and a uniform quantizer with 32 levels employed, the resulting Bit rate and SQNR are respectively.

A message signal m(t) and a carrier signal C(t) are applied to an amplitude modulation shown

The message signal m(t) is band-limited to f_m, where f_c≫ 3f_m. The BPF has a unity passband gain over a Bandwidth of 2f_m centred at f_c. The input-output characteristic of non-linear device is y(t) = 8x(t) + 2x²(t). If average power of message signal m(t) is 16W, find the % transmission efficiency of resultant AM signal.