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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)



Harbin Institute of Technology (Weihai)




Harbin Institute of Technology (Weihai)




Gaussian Doublet

Harbin Institute of Technology (Weihai)


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)


  • 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)


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)


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


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


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)


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)


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


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)


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


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


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