| 摘要 |
"Spread spectrum communication system" Apparatus for generating a pseudo-noise (PN) code sequence with a relatively short repeatable code length, to facilitate signal acquisition in a receiver, but also having a spectrum that is practically indistinguishable from electromagnetic noise. A primary PN code sequence of relatively short length is combined with a secondary random or pseudo-random code sequence having a chip rate approximately equal to the code repetition rate of the primary PN code, to produce a composite code. When the composite code is used to modulate a carrier signal, the resulting frequency spectrum is similar to noise, but retains the short code property of ease of signal acquisition.
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