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Chapter 5 Transmitter Design. 5.1 I-UWB signal generators 5.2 Modulators 5.3 I-UWB transmitters 5.4 MC-UWB transmitters 5.5 Spectral encoded UWB communication system. 5.1 I-UWB signal generators. 5.1.1 Avalanche( 雪崩 )Pulse Generators

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Chapter 5 transmitter design
Chapter 5 Transmitter Design

  • 5.1 I-UWB signal generators

  • 5.2 Modulators

  • 5.3 I-UWB transmitters

  • 5.4MC-UWB transmitters

  • 5.5 Spectral encoded UWB communication system

Harbin Institute of Technology (Weihai)


5 1 i uwb signal generators
5.1 I-UWB signal generators

  • 5.1.1 Avalanche(雪崩)Pulse Generators

    • A transistor driven into avalanche breakdown can produce a very fast-rise time pulse.

    • The device is biased somewhere between BVCEO and BVCEX with the base biased at zero volts or a small negative voltage.

Harbin Institute of Technology (Weihai)




Question
Question:

  • What can we do if a positive UWB signal is requested?

Harbin Institute of Technology (Weihai)



Chapter 5 transmitter design

Harbin Institute of Technology (Weihai)




Chapter 5 transmitter design

Harbin Institute of Technology (Weihai)




Chapter 5 transmitter design

Gaussian Doublet

Harbin Institute of Technology (Weihai)


Chapter 5 transmitter design

Harbin Institute of Technology (Weihai)



5 2 modulators
5.2 Modulators

  • Carrier-based system

  • Amplitude modulation or on/off keying(OOK)

  • Pulse position modulation (PPM)

  • Biphase pulse polarity modulation (antipodal PAM)

  • Pulse width modulation (PWM)

Harbin Institute of Technology (Weihai)



5 3 i uwb transmitters
5.3 I-UWB transmitters

  • Time-hopped pulse position modulation

    (TH-PPM)

  • Optical orthogonal coded PPM (OOC-PPM)

  • Direct sequence spread spectrum modulation (DS)

  • Transmitted reference (TR)

  • Pilot waveform assisted modulation (PWAM)

Harbin Institute of Technology (Weihai)


Time hopped pulse position modulation th ppm
Time-hopped pulse position modulation (TH-PPM)

Harbin Institute of Technology (Weihai)


5 3 2 ooc ppm
5.3.2 OOC-PPM

Harbin Institute of Technology (Weihai)


5 3 3 ds uwb
5.3.3 DS-UWB

Harbin Institute of Technology (Weihai)


5 3 4 transmitter reference tr uwb
5.3.4 Transmitter Reference (TR) UWB

Harbin Institute of Technology (Weihai)


5 4 mc uwb transmitters
5.4 MC-UWB transmitters

  • A single data stream is split into multiple parallel data streams of reduced rate, with each stream transmitted on a separate frequency (subcarrier).

  • Each carrier is modulated at a low enough rate to minimize inter-symbol interference (ISI).

  • Subcarriers must be properly spaced so that they do not interfer.

Harbin Institute of Technology (Weihai)


Chapter 5 transmitter design

  • For a N subcarrier system, each subchannel is tolerant of N times as much dispersion as the original single carrier system.

  • MC-UWB use orthogonal UWB pulse trains and multiple subchannels to achieve reliable high bit rate transmission and spectral efficiency.

  • Advantages: better time resolution->better performance in multipath fading channels; better spectrum utilization->higher bit rate communications; simple decoupled system design->simple transmitter implementation

Harbin Institute of Technology (Weihai)


Chapter 5 transmitter design

Harbin Institute of Technology (Weihai) times as much dispersion as the original single carrier system.


5 4 1 ofdm uwb signals
5.4.1 OFDM-UWB signals times as much dispersion as the original single carrier system.

Harbin Institute of Technology (Weihai)


Chapter 5 transmitter design

Harbin Institute of Technology (Weihai) times as much dispersion as the original single carrier system.


Chapter 5 transmitter design

Harbin Institute of Technology (Weihai) times as much dispersion as the original single carrier system.


Chapter 5 transmitter design

Multi-band OFDM UWB Solution for IEEE times as much dispersion as the original single carrier system.802.15.3a WPANsMarilynn P. Wylie-Green, Pekka A. Ranta and Juha SalokannelNokia Research Center, P.O. Box 407, FIN-00045 Nokia Group, Finland.

Harbin Institute of Technology (Weihai)


Chapter 5 transmitter design

Harbin Institute of Technology (Weihai) times as much dispersion as the original single carrier system.


Ieee p802 15 03 268r2
IEEE P802.15-03/268r2 times as much dispersion as the original single carrier system.

Harbin Institute of Technology (Weihai)


Chapter 5 transmitter design

Harbin Institute of Technology (Weihai) times as much dispersion as the original single carrier system.


Chapter 5 transmitter design

Harbin Institute of Technology (Weihai) times as much dispersion as the original single carrier system.


5 5 spectral encoded uwb system
5.5 Spectral encoded UWB system times as much dispersion as the original single carrier system.

  • A multiple access scheme with interference suppression capability

  • Transmitted signal spectrum can be conveniently shaped to suppress NBI.

  • Signal will be spread in time

Harbin Institute of Technology (Weihai)


Chapter 5 transmitter design

Harbin Institute of Technology (Weihai) times as much dispersion as the original single carrier system.


Chapter 5 transmitter design

Harbin Institute of Technology (Weihai) times as much dispersion as the original single carrier system.