Amplitude shift keying, Frequency Shift Keying, Binary Phase Shift Keying: Generation and Detection
1. Why is coherent detection preferred over non-coherent detection in PSK systems under AWGN?
2. Consider a 4-PSK system. What is the minimum Euclidean distance between symbols if the signal power is normalized to 1?
3. In digital modulation, what factor primarily determines the bandwidth efficiency of a scheme?
4. In BPSK, what is the theoretical bit error rate (BER) under AWGN with coherent detection and Eb/N0 = 10 dB?
5. In M-ary PSK, what is the primary trade-off when increasing the value of M?
6. How does Gray coding benefit digital modulation schemes?
7. For a signal with bit rate R and modulation with k bits per symbol, what is the symbol rate?
8. Which modulation technique exhibits a constant envelope, making it suitable for nonlinear power amplifiers?
9. A digital system transmits 16-QAM symbols at 1 Msymbol/s. What is the bit rate of the system?
10. In a binary ASK system with coherent detection, what kind of filter maximizes the SNR at the detector?