Meant for the course on Communication Systems, the book lays emphasis on the system level understanding of wireless, networking and other communication technologies. Comprehensive coverage and strong pedagogical features are some of its key features. Key Features: Extensive update on topics like DSP, new DAC and ADC circuits, digital modulation and spectral efficiency. Expanded coverage of the I/Q architecture for digital data transmission. "Pioneers of electronics": This special feature helps the students to review before going for examinations. "Good to know": This provides interesting added insights to the topics. Presence of critical thinking problems at the end of every chapter. Extensive coverage on current technologies like, Internet technologies Cell phone technologies Wireless technologies Pedagogy Solved Examples: 98 Review Problems: 1187 Numerical Questions: 242 Critical thinking questions: 117 Total :1644 Table of Content: Chapter 1. Introduction to electronic communications Chapter 2. The fundamentals of electronics- a review Chapter 3. Amplitude modulation fundamentals Chapter 4. Amplitude modulator and demodulator circuits Chapter 5. Fundamentals of frequency modulation Chapter 6. FM Circuits Chapter 7. Digital Communication techniques Chapter 8. Radio transmitters Chapter 9. Communication receivers Chapter 10. Multiplexing and demultiplexing Chapter 11. The transmission of binary data in communication s