Example of a geometrical description of M-ary QAM: (QAM – OFDM

64 Pages·2012·2.01 MB·English

Example of a geometrical description of M-ary QAM:
(QAM – OFDM – MIMO)

“From signal waveforms to signal points”
• The signal space concept is general and powerful.
• Increased insight and understanding.
• Improved analysis and implementations.
• We can understand more complicated systems.
Digital communications - Advanced course:
1
Introduction - week 1
Digital communications - Advanced course:
2
Introduction - week 1
Digital communications - Advanced course:
3
Introduction - week 1
Digital communications - Advanced course:
4
Introduction - week 1
After the correlators we obtain a received noisy signalpoint r!
Digital communications - Advanced course:
5
Introduction - week 1
Digital communications - Advanced course:
6
Introduction - week 1
The distance between the received noisy signal point r and
the signal point zj is:
Digital communications - Advanced course:
7
Introduction - week 1
MAP decision rule:
ML decision rule = minimum distance decision rule:
Digital communications - Advanced course:
8
Introduction - week 1
Digital communications - Advanced course:
9
Introduction - week 1
Digital communications - Advanced course:
10
Introduction - week 1