Transcription of CHAPTER 2 DIGITAL MODULATION 2.1 INTRODUCTION
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CHAPTER 2 DIGITAL MODULATION 2.1 INTRODUCTION
1 CHAPTER 2 DIGITAL MODULATION INTRODUCTION Referring to Equation ( ), if the information signal is DIGITAL and the amplitude (lV of the carrier is varied proportional to the information signal, a digitally modulated signal called amplitude shift keying (ASK) is produced. If the frequency (f) is varied proportional to the information signal, frequency shift keying (FSK) is produced, and if the phase of the carrier (0) is varied proportional to the information signal, phase shift keying (PSK) is produced. If both the amplitude and the phase are varied proportional to the information signal, quadrature amplitude MODULATION (QAM) results. ASK, FSK, PSK, and QAM are all forms of DIGITAL MODULATION : ( ) Figure 2-1 shows a simplified block diagram for a DIGITAL MODULATION system.)
Equation 2-5 can be simplified and rearranged to express the number of conditions possible with N bits as 2N=M (2.6) For example, with one bit, only 2 1 = 2 conditions are possible. With two bits, 2 2 = 4 conditions are possible, with three bits, 2 3 = 8 conditions are possible, and so on. 2-2-3 Baud and Minimum Bandwidth
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