In this article, you will discover What is spread spectrum FHSS and DSSS?, What is meant by spread spectrum?, What is the full form of FHSS?
What is spread spectrum FHSS and DSSS?
Spread spectrum refers to a technique used in telecommunications and radio communication to spread the transmission of a signal over a wider frequency range than the minimum necessary for communication. This method improves resistance to interference and improves signal security and reliability.
Spread spectrum techniques include frequency hopping spread spectrum (FHSS) and direct sequence deviation spectrum (DSSS).
Frequency Hopping Spread Spectrum (FHSS) involves rapid switching of the carrier frequency of the transmitted signal based on a sequence known to both the transmitter and receiver. This technique divides the available spectrum into multiple frequency channels, and the transmitter jumps from one channel to another in a pseudorandom pattern.
FHSS is robust against narrowband interference and provides improved resistance to fading and multipath effects.
Direct broadcast sequence spectrum (DSSS) involves modulating the data signal with a gap code that spreads the signal bandwidth over a much wider frequency range than the original signal bandwidth. The display code is usually a pseudorandom sequence known to both the transmitter and the receiver, allowing the receiver to override the signal and recover the original data.
DSSS improves resistance to interference and provides increased security and reliability.
What is meant by spread spectrum?
The term “propagation spectrum” refers broadly to the technique of propagating the signal over a bandwidth wider than the minimum required for transmission. It aims to realize multiple benefits, including increased resistance to interference, improved privacy, and increased signal robustness in harsh environments.
Propagation spectrum is widely used in various applications, including military communications, wireless networks, satellite communications, and GPS systems.
What is the full form of FHSS?
FHSS stands for Frequency Hopping Spread Spectrum. This is a propagation spectrum modulation technique where the transmitter jumps between different frequencies in a predefined sequence.
This hopping sequence is synchronized between the transmitter and receiver, allowing data to be transmitted reliably over a wider bandwidth while mitigating the effects of interference and noise.
DSSS stands for Direct Sequence Propagation Spectrum. This is another spread spectrum modulation technique where the data signal is modulated with a gap code that spreads the signal over a much wider frequency band than the bandwidth of the original signal.
DSSS increases signal resilience against interference, improves data transmission reliability, and provides enhanced security by spreading signal energy across a broad spectrum.
In Wi-Fi technology, Direct Broadcast Spectrum (DSSS) is commonly used. Early versions of Wi-Fi networks, such as those based on the 802.11b standard, used DSSS modulation to transmit data over the wireless channel. DSSS helps mitigate the effects of interference and noise in wireless environments, contributing to reliable data transmission and communication stability in Wi-Fi networks.
Newer Wi-Fi standards, such as 802.11n, 802.11ac and 802.11ax, have evolved to use orthogonal frequency division modulation (OFDM) techniques, which provide higher data rates and improved spectrum efficiency compared to DSSS.
We hope this overview of What is Spread Spectrum FHSS and DSSS? has made things clearer
