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Phase Shift Keying (PSK) Video Lecture | Electrical Engineering Optional Notes for UPSC
FAQs on Phase Shift Keying (PSK) Video Lecture - Electrical Engineering Optional Notes for UPSC
| 1. What is Phase Shift Keying (PSK) and how does it work? |  |
Ans. Phase Shift Keying (PSK) is a digital modulation technique used to encode data by varying the phase of a carrier wave. In PSK, the data is represented by changing the phase of the signal at specific intervals. For example, in Binary PSK (BPSK), two phases (0° and 180°) are used to represent binary digits 0 and 1. The receiver detects these phase changes to decode the transmitted information accurately.
| 2. What are the different types of Phase Shift Keying? | |
Ans. The main types of Phase Shift Keying include Binary PSK (BPSK), Quadrature PSK (QPSK), and higher-order PSK like 8-PSK and 16-PSK. BPSK uses two phases, QPSK uses four phases to encode two bits per symbol, and higher-order PSK uses more phases to transmit more bits per symbol, increasing the data rate while maintaining bandwidth efficiency.
| 3. What are the advantages of using PSK over other modulation techniques? | |
Ans. PSK offers several advantages, including improved noise immunity, which makes it more resilient to signal degradation in noisy environments. Additionally, PSK can be more bandwidth-efficient compared to techniques like Amplitude Modulation (AM), allowing for higher data rates. Its ability to convey multiple bits per symbol in higher-order PSK schemes also enhances overall throughput.
| 4. In what applications is Phase Shift Keying commonly used? | |
Ans. Phase Shift Keying is widely used in various communication systems, including satellite communication, wireless networks, and digital television broadcasting. Its robustness against noise makes it suitable for applications that require reliable data transmission over long distances. PSK is also commonly used in modems and for transmitting digital data over radio frequencies.
| 5. What are the challenges associated with Phase Shift Keying? | |
Ans. While PSK has many advantages, it also faces challenges such as phase ambiguity, which can occur in environments with multipath propagation. The demodulation process can be complex, especially for higher-order PSK schemes, and requires precise synchronization. Additionally, as the number of phases increases, the system becomes more susceptible to phase noise, which can affect signal integrity.
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Sep 06, 2025
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