What is meant by spread spectrum?

Definition(s): Telecommunications techniques in which a signal is transmitted in a bandwidth considerably greater than the frequency content of the original information. Frequency hopping, direct sequence spreading, time scrambling, and combinations of these techniques are forms of spread spectrum.

What is spreading and despreading?

Spreading and Despreading. The rapid phase transition (chip rate ) signal has a larger bandwidth given that the rate is greater (without changing the power of the original signal) and behaves similar to noise in such a way that their spectrums are similar for bandwidth in scope. The signal is “hidden” under the noise.

How is spread spectrum used in a band?

A spread spectrum signal can effectively overlay in a band with other signals, expanding the utility of the band. Because many spread spectrum techniques employ code division multiplexing, some privacy of communications can be had through pseudo-random sequencing, but the transmissions must not be used to obscure the meaning of communications.

How is the original signal recovered from the spread spectrum?

The original signal is recovered by multiplying the spread-spectrum signal by the same PN code. A spread-spectrum signal has lower peak power, equal total power, and wider bandwidth.

How is the frequency of a spread spectrum transmitter determined?

Figure 1: Block diagram of FHSS transmitter, from William Stallings “Data and Computer Communications”. The frequency of the carrier c (t), i.e. the sequence of channels, depends on the spreading code, which is generated by a pseudonoise (PN) source.

Who is the founder of spread spectrum technologies?

The brand that brought true innovation and iconic products like the “Ampzilla” amplifier to audiophiles around the world remains a paragon of high-end audio. Spread Spectrum Technologies, founded by legendary designer and engineer James Bongiorno, has always embodied the essence of high-end audio: Forward-thinking,…