نظام المحاضرات الالكترونينظام المحاضرات الالكتروني.

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Presentation transcript:

نظام المحاضرات الالكترونينظام المحاضرات الالكتروني

Digital Modulation and Multiplexing  Digital Modulation  Baseband Transmission  Passband Transmission  Multiplexing  Frequency Division Multiplexing  Wavelength Division Multiplexing  Time Division Multiplexing  Code Division Multiple Access

نظام المحاضرات الالكترونينظام المحاضرات الالكتروني  Digital Modulation  Baseband Transmission (Digital Data, Digital Signal)

نظام المحاضرات الالكترونينظام المحاضرات الالكتروني  Digital Modulation  Baseband Transmission (Digital Data, Digital Signal)

نظام المحاضرات الالكترونينظام المحاضرات الالكتروني  Digital Modulation  Passband Transmission (Digital Data, Analog Signal) (a) A binary signal (b) Amplitude modulation (c) Frequency modulation (d) Phase modulation

نظام المحاضرات الالكترونينظام المحاضرات الالكتروني  Digital Modulation  Passband Transmission (Digital Data, Analog Signal)

نظام المحاضرات الالكترونينظام المحاضرات الالكتروني  Multiplexing  Frequency Division Multiplexing (a) The original bandwidths. (b) The bandwidths raised in frequency. (b) The multiplexed channel.

نظام المحاضرات الالكترونينظام المحاضرات الالكتروني  Multiplexing  Frequency Division Multiplexing (2) Orthogonal frequency division multiplexing (OFDM). OFDM (Orthogonal FDM) is an efficient FDM technique used for , 4G cellular and other communications – Subcarriers are coordinated to be tightly packed

نظام المحاضرات الالكترونينظام المحاضرات الالكتروني  Multiplexing  Wavelength Division Multiplexing Wavelength Division Multiplexing. Wavelength Division Multiplexing: Actually the same as FDM, but used for fiber optics.

نظام المحاضرات الالكترونينظام المحاضرات الالكتروني  Multiplexing  Time Division Multiplexing Time division multiplexing shares a channel over time: – Users take turns on a fixed schedule; this is not packet switching or STDM (Statistical TDM) – Widely used in telephone / cellular systems

نظام المحاضرات الالكترونينظام المحاضرات الالكتروني  Multiplexing  Code Division Multiplexing CDM (Code Division Multiplexing) is a form of spread spectrum communication in which a narrowband signal is spread out over a wider frequency band. This can make it more tolerant of interference, as well as allowing multiple signals from different users to share the same frequency band.