In DPSK system, input signal is differentially encoded and then modulated using a ________ modulator.(a) Amplitude(b) Frequency(c) BPSK(d) QPSKThe question was posed to me in an internship interview.My question comes from Linear Modulation Techniques in division Modulation Techniques for Mobile Radio of Wireless/Mobile

In DPSK system, input signal is differentially encoded and then modula

1.	In DPSK system, input signal is differentially encoded and then modulated using a ________ modulator.(a) Amplitude(b) Frequency(c) BPSK(d) QPSKThe question was posed to me in an internship interview.My question comes from Linear Modulation Techniques in division Modulation Techniques for Mobile Radio of Wireless/Mobile
Answer» Correct answer is (c) BPSK The best EXPLANATION: In DPSK system, input binary sequence is FIRST differentially encoded and then MODULATED using a BPSK modulator. The differentially encoded sequence is generated from input binary sequence by complimenting their modulo-2 SUM.

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