Understanding FSK and FHSS combination

1. Why FSK is not suitable for high speed modem?
2. What does 2.4 GHz FHSS mean?
3. What do you understand by FHSS?
4. Which modulation technique is used in FHSS?

Why FSK is not suitable for high speed modem?

FSK modems are inefficient in their use of bandwidth, with the result that the maximum data rate over normal telephone lines is 1800 bps. Typically, for rates over 1200 bps, other modulation schemes are used.

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.

What do you understand by FHSS?

Frequency Hopping Spread Spectrum (FHSS) is a transmission technology in which the data signal is modulated by a narrowband carrier signal which changes frequency ("hops") over a wide band of frequencies. The hopping seems random but is prescribed by an algorithm known to the receiving system.

Which modulation technique is used in FHSS?

FSK modulation technique can be used for performing FHSS modulation (Fig. 8(c) and Fig. 8(d)). In a frequency-hopping spread spectrum sequence, each value in the pseudo random sequence is known as a channel number and the inverse of its period as the hop rate.