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Material Type: Exam; Class: Intro Wireless Comm/Networking; Subject: Information Technology; University: George Mason University; Term: Fall 2014;
Typology: Exams
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MidTerm Review Stallings Chapters 1 – 6 CCNA Wireless Certification guide Chapters 1,3, Review all assignments RF Fundamentals RF spectrum used in wireless networks: Microwave frequency range 1 GHz to 40 GHz Directional beams possible Suitable for point-to-point transmission Used for satellite communications Radio frequency range 30 MHz to 1 GHz Suitable for omnidirectional applications Infrared frequency range Roughly, 3x10^11 to 2x10^14 Hz Useful in local point-to-point multipoint applications within confined areas Bandwidth, Channel Capacity (Shannon, Nyquist) Bandwidth- - the bandwidth of the transmitted signal as constrained by the transmitter and the nature of the transmission medium (Hertz) Channel capacity- the maximum rate at which data can be transmitted over a given communication path, or channel, under given conditions Degradation of the wireless signal Free space loss
Absorption Reflection, Refraction, Diffraction, scattering Multipath fading Fast, Slow, Flat, Selective fading Types of noise, SNR Units: Watts (1 W= 1J/s or 1Volt * 1Amp) Relative measurements (dB, dBm , dBi ) (know how decibel is defined for power ratio and voltage ratio) Antenna principles Antenna Types (Hertz, Marconi, Parabolic reflective) Antenna gain, EIRP (Effective Isotropic Radiated Power) Radiation pattern Propagation modes Ground Wave, Sky Wave, LOS (how they relate to RF frequencies), Fresnel zone Antenna Polarization (vertical, horizontal, circular) Antenna diversity (space, frequency) Signal encoding techniques (AM,FM,PM, ASK,PSK,FSK – know the difference between AM and ASK etc) Apply the knowledge to US AM and FM radio broadcast (Review Class workshop, composite waveform characteristics, Carson rule) PCM ,Delta Modulation What is quantizing and dynamic range, companding