'Quadrature phase shift keying' presentation slideshows

Digital Modulation

2.2k views • 72 slides

Wireless Basics and Models Chapter 2

Wireless Basics and Models Chapter 2. TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: A A A A. Overview. Frequencies Signals Antennas Signal propagation Multiplexing Modulation Models, models, models. Physical Layer: Wireless Frequencies. regulated.

639 views • 55 slides

1.01k views • 40 slides

Physical layer basics

Physical layer basics. transmit bit stream from sender to receiver what does sender need to do? what is transmitted into the air? what happens in the air? what does receiver need to do?. modulation. channel coding. source coding. At sender. analog signal. bit stream.

511 views • 34 slides

Physical layer: Public Switched Telephone Network (PSTN)

Physical layer: Public Switched Telephone Network (PSTN). Public Switched Telephone Network. Structure The Local Loop Trunks and Multiplexing Switching . Network Structure. minimize number of wires add multiple levels. Typical Circuit. local loops trunks switching offices.

1.07k views • 24 slides

Modulation

Modulation. Conversion of digital information to analog signals Example: Telephone lines are band-limited (300-3300Hz) Modem = mo dulator/ dem odulator Characteristics of defining sine waves: Amplitude Frequency Phase. Change one or more of them to send information. Modulation.

463 views • 10 slides