Modulation and demodulation system for spread spectrum transmiss

Details Modulation and demodulation system for spread spectrum transmiss Modulation and demodulation system for spread spectrum transmiss

1991-09-19

1992-12-08

Cangialosi, Salvatore

Pulse or digital communications

Repeaters

Testing

H04L 900, H04K 100

Patent

active

051704110

ABSTRACT:
A modulation and demodulation system for spread spectrum transmission comprises modulation and demodulation sections. The modulation section spreads/modulates an input information signal by multiplying by a PN code to provide a spread spectrum signal. The demodulation section despreads/demodulates the spread spectrum signal including interference mixed therein by substantially using the same spread code. In the demodulation section, a first multiplier despreads the received signal by multiplying by the PN code to provide a despread demodulation signal, a high-pass filter extracts a first spread interference signal from the despread demodulation signal, a second multiplier multiplies the spread interference signal by a high-frequency range emphasized PN code, a low-pass filter attenuates high-frequency range components of the output signal of the second multiplier, a third multiplier multiplies the output signal of the low-pass filter by a high-frequency range attenuated PN code, an emphasizing circuit emphasizes low-frequency range components of the output signal of the third multiplier to provide a second spread interference signal, and a subtracter obtains the difference between the second spread interference signal and the despread demodulation signal to provide the interference-free demodulated information signal.

REFERENCES:
patent: 5084899 (1992-01-01), Harrington

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