The most practical and dominant methods of spread-spectrum communications are direct-sequence modulation and frequency hopping of digital communications. At first it might seem that a spread-spectrum ...

DSSS multiplies the data bits by a very fast pseudo-random bit pattern (PN sequence) that "spreads ... was also a co-inventor of frequency hopping. She, along with George Antheil, an American ...

Spread spectrum ... a relatively wide frequency band. To receive the signal, the long code is used to extract the original signal. Because the energy is spread over a wide bandwidth, multiple CDMA ...

Known as "pseudo-random noise codes," Walsh codes are used in direct sequence spread spectrum (DSSS) systems such as Qualcomm's CDMA. They are also used in frequency hopping spread spectrum (FHSS ...