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FH meaning in Telecommunication ? |
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Answer» What is Frequency Hopping mean? Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly changing the carrier frequency among many distinct frequencies occupying a large spectral band. The changes are controlled by a code known to both transmitter and receiver. FHSS is used to avoid interference, to prevent eavesdropping, and to enable code-division multiple access (CDMA) communications. The available frequency band is divided into smaller sub-bands. Signals rapidly change ("hop") their carrier frequencies among the center frequencies of these sub-bands in a predetermined order. Interference at a specific frequency will only affect the signal during a short interval. FHSS offers four main advantages over a fixed-frequency transmission: FHSS signals are highly resistant to narrowband interference because the signal hops to a different frequency band.Signals are difficult to intercept if the frequency-hopping pattern is not known.Jamming is also difficult if the pattern is unknown; a malicious individual may only jam the signal for a single hopping period if the spreading sequence is unknown.FHSS transmissions can share a frequency band with many types of conventional transmissions with minimal mutual interference. FHSS signals add minimal interference to narrowband communications, and vice versa. reference |
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