Differences between FHSS and DSSS
Category |
FHSS |
DSSS |
---|---|---|
Abbreviation |
FHSS is Frequency-Hopping Spread Spectrum | DSSS is Direct-Sequence Spread Spectrum |
Definition |
FHSS is a type of spread spectrum technology in which the frequency of the transmitted signal changes according to a specific pattern. | DSSS is a type of spread spectrum technology in which the transmitted signal is spread across multiple frequency bands. |
Pattern |
In FHSS, the data transmission is encoded and decoded using a specific pattern called hopset. | In DSSS, the data transmission is encoded and decoded using a pseudo-random binary sequence or chip code. |
Frequency band |
FHSS transmits data using a narrowband carrier that hops among different frequency channels. | DSSS transmits data using a wider frequency band. |
Interference resistant |
FHSS is more resistant to interference because it uses frequency hopping, which makes it difficult to intercept the signal. | DSSS is more vulnerable to interference because it uses a wider frequency band. |
Susceptibility |
FHSS is less susceptible to multipath fading, it is a phenomenon in which the transmitted signal arrives at the receiver via multiple paths, resulting in a loss of signal quality. | DSSS is more susceptible to multipath fading because it uses a wider frequency band. |
Transmission speed |
FHSS has low transmission rates (up to 3 Mbps). | DSSS has high transmission rates (up to 11 Mbps). |
Modulation techniques used |
Multilevel Frequency Shift Keying (FSK) was used. | BPSK (Binary Phase-Shift Keying) was used. |
Efficiency |
FHSS is generally more efficient than DSSS in terms of bandwidth utilization. | DSSS is less efficient because it uses a wider frequency band. |
Application areas |
It is widely used in a variety of applications, including wireless networking like Bluetooth, mobile communications, and military communications. | It is well-suited for particular applications where the signal must travel over long distances like GPS, and WIFI. |
Conclusion
In conclusion, Frequency-hopping spread spectrum (FHSS) and Direct sequence spread spectrum (DSSS) are both types of spread spectrum techniques that are used in a variety of applications, including wireless communication, radar, and GPS. FHSS involves rapid frequency switching of the transmitted signal among a set of specific frequencies, while DSSS involves spreading the spectrum of the original signal over a wider bandwidth by multiplying it with a pseudo-random sequence of bits.
Difference between FHSS and DSSS
Spread spectrum is a communication technique in which the frequency spectrum of a signal is spread out over a wider bandwidth than the minimum bandwidth required to transmit the information. It is used in wireless communications to transmit signals over a wide frequency range. It involves the spreading of signal energy over a wide range of frequencies, which helps to reduce interference with other signals and improves the reliability of communication. There are two main types of spread spectrum: Frequency Hopping Spread Spectrum (FHSS) and Direct Sequence Spread Spectrum (DSSS).