Pulse or digital communications – Repeaters – Testing
Patent
1996-04-10
1998-02-03
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375200, 375206, H04B 1500, H04K 100, H04L 2730
Patent
active
057152756
ABSTRACT:
For spread spectrum communication using a frequency hopping method, this invention is to provide a method and an apparatus for two-way simultaneous communication for transmitting/receiving with a compact circuit and without lowering a transmission rate. Data to be transmitted is encoded by an encoder circuit, and modulated by a modulator circuit according to FSK or PSK. On the other hand, a frequency synthesizer outputs a spread sequence series for frequency hopping according to a spread sequence control. The output signal from a modulator circuit is mixed by a mixer with the output signal from the frequency synthesizer. The frequency of the output signal from the mixer is shifted to a radio-frequency band by an up converter, and transmitted through a transmitting circuit. The receiver down-converts the received signal and mixes it with the output signal from the frequency synthesizer to extract significant data. The transmitter uses the spread sequence series to transmit, and the spread sequence series from the frequency synthesizer, which is delayed for a prescribed period by a waveform delay circuit, to receive. The receiver uses the spread sequence series from the frequency synthesizer to receive and the spread sequence series from the frequency synthesizer, which is delayed for a prescribed period by the waveform delay circuit, to transmit.
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Chin Stephen
Ghayour Mohammad
Sanyo Electric Co,. Ltd.
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