What is the difference between FHSS and DSSS?

The difference between FHSS and DSSS is their different ways of transmitting the information into a wider bandwidth. FHSS uses the process of “hopping” while DSSS connects the signals through pseudo-noise. FHSS is one of the two-spread spectrum technology, which is a form of radio transmission.

What is FHSS transmitter?

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.

What is hybrid spread spectrum technique?

Hybrid spread-spectrum (HSS) systems, which combine direct-sequence (DS) and frequency-hopping (FH) spread-spectrum (SS) techniques, are attractive for their strong multiple-access capabilities, resistance to multipath fading and intentional/unintentional jamming, and the security they provide against eavesdroppers [1- …

What are the specific advantage of FHSS over DSSS?

IEEE 802.11 FHSS provides the following advantages (in comparison to DSSS): Greater tolerance of signal interference because of operation over wider (83.5MHz) bandwidth. Capability to operate up to 10 collocated access points without significant interference.

What is the difference between slow and fast FHSS?

In slow frequency hopping, multiple symbols are transmitted in one frequency hop. In fast frequency hopping, multiple hops are required to transmit one symbol. One or more symbols are transmitted over the same carrier frequency.

What is difference between frequency and spread hopping?

By definition, a spread-spectrum system uses a process other than the information signal to expand, or spread, the bandwidth of the signal. In frequency hopping, data is directly modulated and the radio carrier is spread by hopping among many channels.

What are the types of FHSS?

There are basically two types of Spread Spectrum modulation techniques: Frequency Hopping (FHSS) and Direct Sequence (DSSS).

Why is FHSS used?

FHSS is useful to counter eavesdropping, as well as to obstruct the frequency jamming of telecommunications and to enable code-division multiple access communications. It can also minimize the effects of unintentional interference.

What is spread spectrum technology explain the FHSS and DSSS techniques for spreading the spectrum?

Hence, these techniques are used for military purposes. These spread spectrum signals transmit at low power density and has a wide spread of signals….Comparison between FHSS and DSSS/CDMA.

What is the set of possible carrier frequencies in Fhss?

hopset
24. What is the set of possible carrier frequencies in FH-SS? Explanation: The set of possible carrier frequencies in FH-SS is called hopset. Hopping occurs of a frequency band that includes a number of channels.

What is the main disadvantage of frequency hopping SS FHSS )?

There are some disadvantages of frequency hopping spread spectrum (FHSS) which are given below, It is need complex frequency synthesizers. Not useful for range and range rate measurements. It requires error correction.

What is the principle of FHSS?

The principle of FHSS is quite simple: a wide frequency band is divided into multiple channels and communications are jumping (hopping) sequentially from one channel to another in a sequence and a rate agreed to advance between the transmitter and the receiver.

How is a DSSS system different from a FHSS system?

• In DSSS, information bits are spread across both frequency and time planes, hence minimizes effect of interference as well as fading. Hence DSSS system prone to errors but at low level compare to FHSS systems. FHSS produces strong bursty errors.

What does FHSS stand for in RF spectrum?

In FHSS, which stands for Frequency Hopping Spread Spectrum, RF carrier frequency is changed according to the Pseudo-random sequence (PRS or PN sequence). This PN sequence is known to both transmitter and Receiver and hence help demodulate/decode the information.

What’s the difference between a FHSS and a PRS?

PRS stands for Pseudo-Random Sequence. Refer CCK vs DSSS vs OFDM>> which explains DSSS transmitter and receiver with signal waveforms. In FHSS, which stands for Frequency Hopping Spread Spectrum, RF carrier frequency is changed according to the Pseudo-random sequence (PRS or PN sequence).

What kind of modulation technique does DSSS use?

DSSS is the modulation technique adopted in IEEE 802.11 based WLAN compliant products. In DSSS systems entire system bandwidth is available for each user all the time. Figure-1 depicts DSSS Transmitter and DSSS receiver Block Diagram.