Frequency-hopping spread spectrum (FHSS)

In this article we will discuss Frequency-hopping spread spectrum (FHSS), will make brief discussion on Frequency-hopping spread spectrum (FHSS), In last article we discuss about Multiplexing.

Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly switching a carrier among many frequency channels, using a pseudo random sequence known to both transmitter and receiver.

The active system numbers in same geographical areas is higher than an equivalent number for direct sequence spread spectrum systems. Thus it is suited well for installations designed to cover large areas where numerous co-located systems are needed. They are also used in cellular deployments for fixed broadband wireless access where direct sequence spread spectrum cannot be used. A variation of frequency hopping spread spectrum is adaptive frequency hopping spread spectrum that improves resistance to radio frequency interference by avoiding crowded frequency in hopping sequence.

FHSS – Frequency Hopping Spread Spectrum. Frequency Hopping Spread Spectrum (FHSS) is a spread spectrum technique used in radio transmission systems. FHSS is for instance used by BluetoothBluetooth hoppes 1600 times per second between the 79 available channels. Frequency hopping spread spectrum is defined in the 2.4 GHz band and operates in around 79 frequencies ranging from 2.402 GHz to 2.480 GHz. Every frequency is GFSK modulated with channel width of 1MHz and rates defined as 1 Mbps and 2 Mbps respectively.

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