Spread spectrum ask/ook transmitter

Details Spread spectrum ask/ook transmitter Spread spectrum ask/ook transmitter

H - Electricity

04

L

H04L 27/04 (2006.01) H03C 1/52 (2006.01) H04L 27/32 (2006.01)

Patent

CA 2644657

An ASK/OOK transmitter includes a frequency-shift keying (FSK) modulator receiving an input bit sequence and generating a FSK modulation signal indicative of the input bit sequence, a frequency generation circuit receiving the FSK modulation signal and generating a carrier signal having a first frequency where the frequency of the carrier signal is shifted by the FSK modulation signal to form a wideband carrier signal, an amplitude-shift keying (ASK) modulator receiving input data and generating an ASK modulation signal indicative of the input data, and a power amplifier coupled to receive the wideband carrier signal as an input signal and the ASK modulation signal as a control signal. The power amplifier provides a spread spectrum ASK transmission signal where the ASK modulation signal modulates the wideband carrier signal to form the spread spectrum ASK transmission signal.

L'invention concerne un émetteur ASK/OOK comprenant un modulateur par déplacement de fréquence (FSK) recevant une séquence de bit d'entrée et générant un signal de modulation FSK indicatif de la séquence de bit d'entrée, un circuit de génération de fréquences recevant le signal de modulation FSK et générant un signal porteur ayant une première fréquence, la fréquence du signal porteur étant déplacée par le signal de modulation FSK pour former un signal porteur à large bande, un modulateur par déplacement d'amplitude (ASK) recevant des données d'entrée et générant un signal de modulation ASK indicatif des données d'entrée et un amplificateur de puissance couplé de manière à recevoir le signal porteur à large bande en tant que signal d'entrée et le signal de modulation ASK en tant que signal de commande. L'amplificateur de puissance fournit un signal de transmission ASK à spectre étalé, le signal de modulation ASK modulant le signal porteur à large bande pour former le signal de transmission ASK à spectre étalé.

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