What technique deliberately spreads the transmitted intelligence over a very wide frequency band?

The technique that deliberately spreads transmitted intelligence over a very wide frequency band is known as Direct Sequence Spread Spectrum (DSSS). This method involves using a pseudorandom noise code to modulate the original data, which effectively increases the bandwidth of the signal. By doing so, the signal can occupy a larger frequency range than the original data alone would require. This spread results in several benefits, including improved resistance to interference and jamming, as well as increased security since it becomes more difficult for unintended recipients to decode the spread signal.

DSSS works by assigning each bit of data a unique sequence of chips (the elements of the code), which appears as noise when viewed without the specific knowledge of the spreading code. This allows multiple users to transmit simultaneously over the same frequency band without interfering with one another, a technique known as code division multiple access (CDMA). Hence, DSSS is particularly effective in environments where reliable data transmission over varying conditions is essential.

Other techniques listed, although they may involve frequency-related strategies, do not spread the intelligence signal over a wide band in the specific manner that DSSS does. Frequency agility refers to the ability to hop between frequencies quickly for avoiding detection, and frequency diversity uses multiple frequencies but may not specifically involve