Fhss spread spectrum

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.

1. What is FHSS and DSSS?
2. What does 2.4 GHz FHSS mean?
3. How does FHSS achieve bandwidth spreading?
4. What are the 3 varieties of spread spectrum?

What is FHSS and DSSS?

Higher signal transmission rate (up to 11 Mbps) FHSS is a robust spread spectrum technique that is suitable to employ in harsh environments. DSSS is a sensitive spread spectrum technique that is influenced by harsh environmental conditions. FHSS is suitable for single point as well as multipoint communications.

What does 2.4 GHz FHSS mean?

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.

How does FHSS achieve bandwidth spreading?

The frequency hopping spread spectrum (FHSS) technique uses M different carrier frequencies that are modulated by the source signal. At one moment, the signal modulates one carrier frequency; at the next moment, the signal modulates another carrier frequency.

What are the 3 varieties of spread spectrum?

Frequency-hopping spread spectrum (FHSS), direct-sequence spread spectrum (DSSS), time-hopping spread spectrum (THSS), chirp spread spectrum (CSS), and combinations of these techniques are forms of spread spectrum.