frequency hopping code - translation to russian
общая лексика
Frequency-Hopping Spread Spectrum
скачкообразная смена рабочей частоты с расширением спектра, сигнал с изменяемой несущей, технология FHSS
технология расширения спектра сигнала изменением несущей частоты сигнала, используется для передачи по широкополосному радиоканалу в диапазоне 2,4 ГГц. Радиопередатчик во время передачи сигнала псевдослучайным образом перескакивает с одной рабочей частоты на другую
Смотрите также
Definition
Wikipedia
Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly changing the carrier frequency among many 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 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 determined order. Interference at a specific frequency will affect the signal only 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; the signal can be jammed only 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.
