Time-hopping
In recent decades, Time-hopping has been the subject of increasing interest by researchers, academics and professionals from various fields. The impact of Time-hopping on modern society is undeniable, its implications range from the economic to the cultural sphere, including the fields of health and technology. In this article, we will explore the various facets of Time-hopping and analyze its influence on different aspects of our daily lives. From its role in the formation of identities to its participation in the development of business strategies, Time-hopping has become a relevant topic that deserves to be examined from multiple perspectives. Through the analysis of Time-hopping, we seek to shed light on its implications and unravel its complexity, in order to better understand its role in the contemporary world.
| Passband modulation |
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| Analog modulation |
| Digital modulation |
| Hierarchical modulation |
| Spread spectrum |
| See also |
| Multiplexing |
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| Analog modulation |
| Related topics |
Time-hopping (TH) is a communications signal technique which can be used to achieve anti-jamming (AJ) or low probability of intercept (LPI). It can also refer to pulse-position modulation, which in its simplest form employs 2k discrete pulses (referring to the unique positions of the pulse within the transmission window) to transmit k bit(s) per pulse.
Details
To achieve LPI, the transmission time is changed randomly by varying the period and duty cycle of the pulse (carrier) using a pseudo-random sequence. The transmitted signal will then have intermittent start and stop times. Although often used to form hybrid spread-spectrum (SS) systems, TH is strictly speaking a non-SS technique. Spreading of the spectrum is caused by other factors associated with TH, such as using pulses with low duty cycle having a wide frequency response. An example of hybrid SS is TH-FHSS or hybrid TDMA (time division multiple access).
See also
References
- Frenzel, Louis E. (2001). Communication Electronics (3rd ed.). New York: McGraw Hill. ISBN 0-02-804837-7.
External links
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