Digital Modulation

A source transmits a symbol s, taken from {-4,0,4} with equal probability, over an additive white Gaussian noise channel. The received noisy symbol r is given by r = s + w, where t...

Which one of the following statements about differential pulse code modulation (DPCM) is true?

The modulation scheme commonly used for transmission from GSM mobile terminals is

In a digital communication system employing Frequency Shift Keying (FSK), the 0 and 1 bit are represented by sine waves of 10 KHz and 25 KHz respectively. These waveforms will be o...

For a given data rate, the bandwidth B p of a BPSK signal and the band width B 0 of the OOK signal are related as

The bit stream 01001 is differentially encoded using 'Delay and Ex OR' scheme for DPSK transmission. Assuming the reference bit as a '1' and assigning phases of '0' and '$$\,\pi $$...

In binary data transmission DPSK is preferred to PSK because

The message bit sequence input to a DPSK modulator is 1, 1, 0, 0, 1, 1. The carrier phase during the reception of the first two message bits is $$\pi ,\,\,\pi $$. The carrier phase...