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扩展频谱[Spread Spectrum] [2005-10-30]
iamet 发表在 Ω〖物理〗
| Any method of transmitting low-bandwidth data in a high bandwidth by adding a fixed high-bandwidth modulation. Properly done, it is immune to jamming, because the receiver removes the high-bandwidth modulation before attempting to detect the data, and any narrowband carriers are spread in the process.
The direct sequence spread spectrum method uses a linear-feedback shift register sequence. The Fourier transform of an LFSR sequence is a discretized version of the sinc function with a notch in the middle.
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