Abstract
Spread spectrum techniques, which are included in this chapter, are techniques by which a digital signal generated with a particular bandwidth is deliberately spread in the frequency domain, which gives the set of techniques this name. These techniques are used primarily to establish a means of secure communications, and in their early days, they were used by the military for their communication needs, since these techniques result in a signal which has enhanced resistance to natural interference, noise and jamming. These techniques are presently also used for civilian applications, especially mobile communications.
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Notes
- 1.
The autocorrelation function of a function is \(R(\tau )=\int _{-\infty }^{\infty }f(t)f(t+\tau )dt\) and is different from the autocorrelation function of a random process.
- 2.
- 3.
Section 11.8.2, Numerical Problem 8.
- 4.
See also Problem 7 which shows the spectral broadening for N pulses.
- 5.
Given in Chap. 10.
- 6.
See Sect. 10.9.
- 7.
Given in Chap. 10.
- 8.
As in Example 11.1.
References
Golomb SW (1967) Coding theory. Holden-Day
Haykin S (1999) Communication systems. Wiley
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Bhooshan, S. (2022). Spread Spectrum Modulation. In: Fundamentals of Analogue and Digital Communication Systems. Lecture Notes in Electrical Engineering, vol 785. Springer, Singapore. https://doi.org/10.1007/978-981-16-4277-7_11
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DOI: https://doi.org/10.1007/978-981-16-4277-7_11
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