GATE ECE 2004 | Digital Communication Systems Question 39 | Communications

GATE ECE 2004

MCQ (Single Correct Answer)

-0.6

A source produces binary data at the rate of 10 kbps. The binary symbols are represented as shown in fig. GATE ECE 2004 Communications - Digital Communication Systems Question 34 English 1

GATE ECE 2004 Communications - Digital Communication Systems Question 34 English 1

GATE ECE 2004 Communications - Digital Communication Systems Question 34 English 2

The source output is transmitted using two modulation schemes, namely Binary PSK (BPSK) and Quadrature PSK (QPSK). Let $${B_1}$$ and $${B_2}$$ be the bandwidth requirements of BPSK and QPSK respectively. Assuming that the bandwidth of the above rectangular pulses is 10 kHz, $${B_1}$$ and $${B_2}$$ are

$${B_1}$$ = 20 KHz, $${B_2}$$ = 20 KHz

$${B_1}$$ = 10 KHz, $${B_2}$$ = 20 KHz

$${B_1}$$ = 20 KHz, $${B_2}$$ = 10 KHz

$${B_1}$$ = 10 KHz, $${B_2}$$ = 10 KHz

GATE ECE 2004

MCQ (Single Correct Answer)

-0.6

Three analog signals, having bandwidths 1200 Hz, 600 Hz and 600 Hz are sampled at their respective Nyquist rates, enocodes with 12 bit words, and time division multiplexed. The bit rate for the multiplexed signal is

115.2 kbps

28.8 kbps

57.6 kbps

38.4 kbps

GATE ECE 2003

MCQ (Single Correct Answer)

-0.6

If S represents the carrier synchronization at the receiver and $$\rho $$ represents the bandwidth efficiency, then the correct statement for the coherent binary PSK is

$$\rho = 0.5,\,S$$ is required

$$\rho = 1.0,\,S$$ is required

$$\rho = 0.5,\,S$$ is not required

$$\rho = 1.0,\,S $$ is not required

GATE ECE 2003

MCQ (Single Correct Answer)

-0.6

A signal is sampled at 8 KHz and is quantized using 8-bit uniform quantizer. Assuming $$SN{R_q}$$ for a sinusoidal signal, the correct statement for PCM signal with a bit rate of R is

R = 32 kbps, $$SN{R_q}$$ = 25.8 dB

R = 64 kbps, $$SN{R_q}$$ = 49.8 dB

R = 64 kbps, $$SN{R_q}$$ = 55.8 dB

R = 32 kbps, $$SN{R_q}$$ = 49.8 dB

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