ECE549_M1L1_4up

ECE549_M1L1_4up - M1 L1 1 NC STATE UNIVERSITY ECE549 RF...

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M1 L1 1 NC STATE UNIVERSITY © M. B. Steer, 1995–2008 ECE549 RF Design for Wireless Professor Michael Steer http://www4.ncsu.edu/~mbs MODULE 1 RF Systems LECTURE 1 Modulation Techniques M1 L1 2 NC STATE UNIVERSITY © M. B. Steer, 1995–2008 Module 1: RF Systems • Amplifiers, Mixers & Oscillators • Antennas and RF Link • Radio Frequency Systems Aim is to develop a full appreciation of an RF communication, focus is on a cellular radio system. System requirements drive component and subsystem development. Also capabilities of components and subsystems drive systems. M1 L1 3 NC STATE UNIVERSITY © M. B. Steer, 1995–2008 Systems Engineering • Service Engineering (Definition A): strong component of logistics, management, accounting, enabling the combining of a number of existing solutions to solve new problems. • Service Engineering (Definition B): Take existing technologies and capabilities and develop new system solutions. • Systems Engineering Integration of a complicated, networked, control, sensor system like a radar or communication system. M1 L1 4 NC STATE UNIVERSITY © M. B. Steer, 1995–2008 COMPONENTS SUBSYSTEM CIRCUITS SUBSYSTEM SUBSYSTEM PRODUCT Complex System INNOVATION PERFORMANCE REQUIREMENTS TECHNOLOGY CAPABILITY PROTEIN/ MOLECULE GENE REGULATION SUBSYSTEM HOMEOSTATIC PROCESSES ORGANISM MUTATION STRESS ADAPTION ELECTRONIC SYSTEM BIOLOGICAL SYSTEM Homeostatic = nervous, insulin, endocrine, … systems
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M1 L1 5 NC STATE UNIVERSITY © M. B. Steer, 1995–2008 Module 1: Lecture 1 • Amplifiers, Mixers & Oscillators – RF Front Ends – RF signals – Analog Modulation – Digital Modulation M1 L1 6 NC STATE UNIVERSITY © M. B. Steer, 1995–2008 Lecture Goal Develop an understanding of modulation techniques used in analog and digital cellular radio. Lecture Outline • Analog Modulation: AM, FM, PM • Introduction to Digital Modulation: ASK, FSK, PSK • Advanced Modulation Concepts – Occupied Bandwidth • Performance of Modulation Types used in Cellular Radio – Analog FM, DQPSK, FSK, GMSK M1 L1 7 NC STATE UNIVERSITY © M. B. Steer, 1995–2008 A Modulator 90 VCO i ( t ) q ( t ) a ( t ) b ( t ) s ( t ) WAVEFORM SHAPING WAVEFORM SHAPING SERIAL TO PARALLEL SERIAL BIT STREAM I K Q K I Q M1 L1 8 NC STATE UNIVERSITY © M. B. Steer, 1995–2008 Performance of Different Modulation Types Each type of modulation has advantages and drawbacks: Necessary bandwidth How wide is the signal? How much spectrum is needed? How big a "guard band" is needed between channels? Relative vulnerability to interference What C/I ratio is required for good system performance? Relative difficulty of implementation Is complex equipment required? Implementation cost? Maintainability
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M1 L1 9 NC STATE UNIVERSITY © M. B. Steer, 1995–2008 Analog Modulation • This analog waveform modulates a sinewave.
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ECE549_M1L1_4up - M1 L1 1 NC STATE UNIVERSITY ECE549 RF...

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