Pulse or digital communications – Repeaters – Testing
Patent
1997-05-23
1999-07-13
Ghebretinsae, Temesghen
Pulse or digital communications
Repeaters
Testing
375207, 375208, 375239, 370213, 332112, H04B 169
Patent
active
059237015
ABSTRACT:
A spread spectrum pulse position modulation/demodulation system which receives an input signal including frames and which includes first and second pulse position modulators. The first pulse position modulator modulates each frame by inserting a first pseudo noise code into a selected slot of each frame according to the input signal to generate a first spread spectrum pulse position modulating signal. The second pulse position modulator modulates each frame by inserting a second pseudo noise code into a selected slot of each frame according to the input signal to generate a second spread spectrum pulse position modulating signal. An adder adds together the first and second spread spectrum pulse position modulating signals to generate a third spread spectrum pulse position modulating signal. This third spread spectrum pulse position modulating signal may be transmitted by a radio transmitter, and then received by a radio receiver. The received third spread spectrum pulse position modulating signal can then be input into a demodulator for demodulating this third spread spectrum pulse position modulating signal. The demodulator includes at least one matched filter to output a first pulse signal corresponding to the first spread spectrum pulse position modulating signal and to output a second pulse signal corresponding to the second spread spectrum pulse position modulating signal.
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"Spread Spectrum Pulse Position Modulation", By Isao Okazaki and Takaaki Hasegawa, IEICE Trans. Commun., vol. E76-B. No. 8 Aug. 1993, pp. 929-940.
Ghebretinsae Temesghen
Ricoh & Company, Ltd.
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