Electronics and Communication Engineering (ECE) Exam > Electronics and Communication Engineering (ECE) Questions > Consider the following statements;1. BPSK has...
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Consider the following statements;
1. BPSK has a bandwidth which is lower than that of a BFSK signal.
2. BPSK yields the maximum value of probability of error compared to ail the three digital modulation techniques i.e. ASK, FSK and PSK.
3. Binary FSK has the highest system complexity.
4. Binary ASK is demodulated using coherent detection while binary FSK and PSK are demodulated using envelope detection
1. BPSK has a bandwidth which is lower than that of a BFSK signal.
2. BPSK yields the maximum value of probability of error compared to ail the three digital modulation techniques i.e. ASK, FSK and PSK.
3. Binary FSK has the highest system complexity.
4. Binary ASK is demodulated using coherent detection while binary FSK and PSK are demodulated using envelope detection
Which of the statements given above are correct?
- a)1 and 3
- b)1,2 and 4
- c)2 and 3
- d)2, 3 and 4
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Consider the following statements;1. BPSK has a bandwidth which is low...
- Statement-1 is correct.
- BPSK has the best performance of all the three digital modulation techniques in presence of noise, it yields the minimum value of probability of error compared to ASK, FSK and PSK. Hence, statement-2 is false.
- Statement-3 is correct since binary FSK has highest system complexity while binary ASK has least system complexity.
- Binary ASK is demodulated using envelope detection while binary FSK and PSK are demodulated using coherent detection.
Hence, statement-4 is fals
Most Upvoted Answer
Consider the following statements;1. BPSK has a bandwidth which is low...
Statement 1: BPSK has a bandwidth which is lower than that of a BFSK signal.
BPSK (Binary Phase Shift Keying) and BFSK (Binary Frequency Shift Keying) are both digital modulation techniques used to transmit binary data. In BPSK, the carrier signal's phase is shifted by 180 degrees based on the input data, while in BFSK, the carrier signal's frequency is shifted based on the input data.
The statement is correct because BPSK has a lower bandwidth compared to BFSK. In BPSK, the phase of the carrier signal is shifted by 180 degrees, resulting in only two possible phase states (0 and 180 degrees). This means that BPSK only requires a small bandwidth to transmit the information. On the other hand, BFSK has two different frequencies representing the two possible binary states, requiring a larger bandwidth to accommodate the frequency shifts.
Statement 2: BPSK yields the maximum value of probability of error compared to all the three digital modulation techniques i.e. ASK, FSK, and PSK.
The statement is incorrect. BPSK does not yield the maximum probability of error compared to ASK (Amplitude Shift Keying), FSK (Frequency Shift Keying), and PSK (Phase Shift Keying). In fact, BPSK is less susceptible to noise and interference compared to ASK and FSK.
The maximum probability of error is typically observed in ASK, where the amplitude of the carrier signal is varied to represent binary data. ASK is more prone to errors because changes in amplitude are more susceptible to noise and distortion. FSK and PSK also have lower probabilities of error compared to ASK.
Statement 3: Binary FSK has the highest system complexity.
The statement is correct. Binary FSK has higher system complexity compared to BPSK, ASK, and PSK. FSK requires the use of multiple carrier frequencies, and the receiver must be able to detect and differentiate between these frequencies to demodulate the signal accurately. This increases the complexity of the system as compared to other modulation techniques.
In contrast, BPSK only requires phase shifting of the carrier signal, ASK only requires amplitude variation, and PSK only requires phase variation. These techniques have lower system complexity compared to FSK.
Statement 4: Binary ASK is demodulated using coherent detection while binary FSK and PSK are demodulated using envelope detection.
The statement is incorrect. Binary ASK, FSK, and PSK can all be demodulated using coherent detection. Coherent detection refers to the detection of the carrier signal's characteristics (amplitude, frequency, or phase) during demodulation.
Envelope detection, on the other hand, refers to the detection of the envelope of the modulated signal without extracting the carrier signal's characteristics. Envelope detection is typically used for amplitude modulated signals like AM (Amplitude Modulation), not for digital modulation techniques like ASK, FSK, and PSK.
Therefore, the correct statements are:
- Statement 1: BPSK has a bandwidth which is lower than that of a BFSK signal.
- Statement 3: Binary FSK has the highest system complexity.
BPSK (Binary Phase Shift Keying) and BFSK (Binary Frequency Shift Keying) are both digital modulation techniques used to transmit binary data. In BPSK, the carrier signal's phase is shifted by 180 degrees based on the input data, while in BFSK, the carrier signal's frequency is shifted based on the input data.
The statement is correct because BPSK has a lower bandwidth compared to BFSK. In BPSK, the phase of the carrier signal is shifted by 180 degrees, resulting in only two possible phase states (0 and 180 degrees). This means that BPSK only requires a small bandwidth to transmit the information. On the other hand, BFSK has two different frequencies representing the two possible binary states, requiring a larger bandwidth to accommodate the frequency shifts.
Statement 2: BPSK yields the maximum value of probability of error compared to all the three digital modulation techniques i.e. ASK, FSK, and PSK.
The statement is incorrect. BPSK does not yield the maximum probability of error compared to ASK (Amplitude Shift Keying), FSK (Frequency Shift Keying), and PSK (Phase Shift Keying). In fact, BPSK is less susceptible to noise and interference compared to ASK and FSK.
The maximum probability of error is typically observed in ASK, where the amplitude of the carrier signal is varied to represent binary data. ASK is more prone to errors because changes in amplitude are more susceptible to noise and distortion. FSK and PSK also have lower probabilities of error compared to ASK.
Statement 3: Binary FSK has the highest system complexity.
The statement is correct. Binary FSK has higher system complexity compared to BPSK, ASK, and PSK. FSK requires the use of multiple carrier frequencies, and the receiver must be able to detect and differentiate between these frequencies to demodulate the signal accurately. This increases the complexity of the system as compared to other modulation techniques.
In contrast, BPSK only requires phase shifting of the carrier signal, ASK only requires amplitude variation, and PSK only requires phase variation. These techniques have lower system complexity compared to FSK.
Statement 4: Binary ASK is demodulated using coherent detection while binary FSK and PSK are demodulated using envelope detection.
The statement is incorrect. Binary ASK, FSK, and PSK can all be demodulated using coherent detection. Coherent detection refers to the detection of the carrier signal's characteristics (amplitude, frequency, or phase) during demodulation.
Envelope detection, on the other hand, refers to the detection of the envelope of the modulated signal without extracting the carrier signal's characteristics. Envelope detection is typically used for amplitude modulated signals like AM (Amplitude Modulation), not for digital modulation techniques like ASK, FSK, and PSK.
Therefore, the correct statements are:
- Statement 1: BPSK has a bandwidth which is lower than that of a BFSK signal.
- Statement 3: Binary FSK has the highest system complexity.
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Consider the following statements;1. BPSK has a bandwidth which is lower than that of a BFSK signal.2. BPSK yields the maximum value of probability of error compared to ail the three digital modulation techniques i.e. ASK, FSK and PSK.3. Binary FSK has the highest system complexity.4. Binary ASK is demodulated using coherent detection while binary FSK and PSK are demodulated using envelope detectionWhich of the statements given above are correct?a)1 and 3b)1,2 and 4c)2 and 3d)2, 3 and 4Correct answer is option 'A'. Can you explain this answer?
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Consider the following statements;1. BPSK has a bandwidth which is lower than that of a BFSK signal.2. BPSK yields the maximum value of probability of error compared to ail the three digital modulation techniques i.e. ASK, FSK and PSK.3. Binary FSK has the highest system complexity.4. Binary ASK is demodulated using coherent detection while binary FSK and PSK are demodulated using envelope detectionWhich of the statements given above are correct?a)1 and 3b)1,2 and 4c)2 and 3d)2, 3 and 4Correct answer is option 'A'. Can you explain this answer? for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Question and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus. Information about Consider the following statements;1. BPSK has a bandwidth which is lower than that of a BFSK signal.2. BPSK yields the maximum value of probability of error compared to ail the three digital modulation techniques i.e. ASK, FSK and PSK.3. Binary FSK has the highest system complexity.4. Binary ASK is demodulated using coherent detection while binary FSK and PSK are demodulated using envelope detectionWhich of the statements given above are correct?a)1 and 3b)1,2 and 4c)2 and 3d)2, 3 and 4Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements;1. BPSK has a bandwidth which is lower than that of a BFSK signal.2. BPSK yields the maximum value of probability of error compared to ail the three digital modulation techniques i.e. ASK, FSK and PSK.3. Binary FSK has the highest system complexity.4. Binary ASK is demodulated using coherent detection while binary FSK and PSK are demodulated using envelope detectionWhich of the statements given above are correct?a)1 and 3b)1,2 and 4c)2 and 3d)2, 3 and 4Correct answer is option 'A'. Can you explain this answer?.
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ample number of questions to practice Consider the following statements;1. BPSK has a bandwidth which is lower than that of a BFSK signal.2. BPSK yields the maximum value of probability of error compared to ail the three digital modulation techniques i.e. ASK, FSK and PSK.3. Binary FSK has the highest system complexity.4. Binary ASK is demodulated using coherent detection while binary FSK and PSK are demodulated using envelope detectionWhich of the statements given above are correct?a)1 and 3b)1,2 and 4c)2 and 3d)2, 3 and 4Correct answer is option 'A'. Can you explain this answer? tests, examples and also practice Electronics and Communication Engineering (ECE) tests.
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