ee 445s real time digital signal processing lab fall 2013
Download
Skip this Video
Download Presentation
EE 445S Real-Time Digital Signal Processing Lab Fall 2013

Loading in 2 Seconds...

play fullscreen
1 / 6

EE 445S Real-Time Digital Signal Processing Lab Fall 2013 - PowerPoint PPT Presentation


  • 124 Views
  • Uploaded on

EE 445S Real-Time Digital Signal Processing Lab Fall 2013. Additional recitation slides for Lab 6 Quadrature Amplitude Modulation (QAM) Debarati Kundu. Additional Constellation diagrams. Quadrature Phase Shift-Keying (QPSK) Phase Shift Keying: 8-state Phase Shift-Keying (8-PSK)

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' EE 445S Real-Time Digital Signal Processing Lab Fall 2013' - falala


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
ee 445s real time digital signal processing lab fall 2013

EE 445S Real-Time Digital Signal Processing LabFall 2013

Additional recitation slides for Lab 6Quadrature Amplitude Modulation (QAM)

Debarati Kundu

additional constellation diagrams
Additional Constellation diagrams
  • Quadrature Phase Shift-Keying (QPSK)
  • Phase Shift Keying:
    • 8-state Phase Shift-Keying (8-PSK)
    • 16-state Phase Shift-Keying (16-PSK)
    • 32-state Phase Shift-Keying (32-PSK)
slide3
QPSK
  • Constellation points: Subset of 16-QAM constellation.
  • Not a unique representation,

but popular.

  • Constellation points lie in a

circle. (“Constant envelope”).

  • Gray coding employed.
  • Bandwidth unchanged

compared to BPSK.

Constellation diagram for QPSK

8 psk
8-PSK
  • Three bits per symbol.
  • Constellation points lie on a circle.
  • More data packed in at the same bandwidth, hence, more spectral efficiency.

Constellation diagram for 8-PSK

even more spectral efficiency
Even more spectral efficiency

Constellation diagram for 16-PSK

Constellation diagram for 32-PSK

an engineering tradeoff
An engineering tradeoff
  • Higher constellation indicates higher data rate.
  • But the points to come closer to each other.
  • At the receiver, higher SNR required at the same error performance.
  • Tradeoff between spectral efficiency and signal quality.
ad