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Orthogonal Frequency Division Multiplexing (OFDM). Ryan Smith Jay Visaria Yoav Klein Eric Cho. The Basics. QPSK Encoding. -System which encodes two bits per symbol -Each symbol has a real part, and imaginary part. Coordinate System. -Real and Imaginary axes

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Presentation Transcript
orthogonal frequency division multiplexing ofdm

Orthogonal Frequency Division Multiplexing (OFDM)

Ryan Smith

Jay Visaria

Yoav Klein

Eric Cho

the basics
The Basics
  • QPSK Encoding

-System which encodes two bits per symbol

-Each symbol has a real part, and imaginary part

  • Coordinate System

-Real and Imaginary axes

-Each Quadrant assigned a particular symbol

ofdm system with noise
OFDM system with noise

General model of an OFDM system

Noise is picked up during data transmission

How does OFDM cope with noise?

How much noise can the system handle?

channeling
Channeling
  • Increase in Speed

Faster computation of FFT / IFFT due to

parallel multiply accumulates.

  • Decrease in Noise

Smaller noise margin due to smaller amount

of data being transmitted per channel.

ofdm applications
OFDM Applications
  • ADSL
  • Wireless networking
  • High Definition Television Broadcasts
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