| 摘要 |
A spread spectrum modulation system uses an input signal and a spreading signal for modulating the input signal. The spreading signal includes a plurality of component signals spaced apart substantially equally in frequency and with substantially equal amplitudes. Each component signal is phase encoded by either having a phase assigned by a random or pseudo-random number generator or by reference to a look-up table. Interference in the spread spectrum system is reduced by detecting, in the received signal, a channel or channels in which interference is present. The parts of the de-spreading signal corresponding to the channel or channels having interference are discarded, so as to form a modified de-spreading signal. The received spread spectrum signal is then de-spread using the modified de-spreading signal.
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