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PANSAT |
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Petite Amateur Navy Satellite |
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Spread-Spectrum Modulation |
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Dynamic Information
Development |
Direct-sequence spread-spectrum modulation is a technique that spreads a conventional narrowband signal by mixing it with a bit stream (see diagram). The result is a dilution of the signal energy with respect to bandwidth. The spread-spectrum signal has the same energy per bit as the narrowband signal, but the power density at any one frequency is significantly lower. The signal can be spread to such a point that it is entirely below the noise level of a conventional receiver, making it difficult to detect or intercept. The receiver of a spread-spectrum signal uses the same bit stream to de-spread the signal. Through the de-spreading of the signal, conventional signals are suppressed, making it resistant to interference and difficult to jam. Click here for more information on spread spectrum communication. |
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