FHSS vs DSSS: Difference and Comparison

Technology and inventions are some of the core components that have made the world easier and, overall, faster year by year. In today’s world, people come in confused in the selection of connection. Spread Spectrum technology is one of the best communication methods.

FHSS and DSSS are types of technologies, types of spectrums really that make the connection between people and maintain it.

One would get confused between the two types of connection because their concept is the same, but their use of bringing that concept into practical ways is different.

Key Takeaways

  1. FHSS stands for Frequency Hopping Spread Spectrum, while DSSS stands for Direct Sequence Spread Spectrum.
  2. FHSS uses a narrowband carrier that hops from one frequency to another, while DSSS uses a spread spectrum technique to spread the signal over a wider bandwidth.
  3. FHSS is more resistant to interference and provides more security, while DSSS offers higher data transfer rates.

FHSS vs DSSS

FHSS and DSSS differ in their different ways of transmitting information to a wider bandwidth. Both the spread spectrums use different processes/technologies. FHSS uses the process of “hopping”, while DSSS connects the signals through pseudo-noise.

FHSS vs DSSS

FHSS is one of the two-spread spectrum technology, which is a form of radio transmission. It bounces or rather hops from frequency to frequency.

That is the reason for its full name being Frequency Hopping Spread Spectrum. It is used in any Wireless Local Area Network, also known as LAWN.

DSSS is also a spread spectrum technology that uses the “pseud noise” technique to send data signals from one place to another. It sends the signal into a wide bandwidth. In order to fulfil this, it breaks down the data, and afterwards, a “chipping code” is generated.

The chipping code should be longer to avoid any errors while transferring the data.

Comparison Table

Parameters of ComparisonFHSSDSSS
AbbreviationFrequency-hopping spread spectrumDirect-sequence spread spectrum
Delivery capability the connection 3 Mbps 11 Mbps
Rate of Signal to Noise Ratio18 dB 12 dB
Advantages The bandwidth of this system is large. The system can be programmed to avoid parts of the spectrum, etc.It is simpler to hide the signal. It is less expensive than FHSS, etc.
Disadvantages Errors in the connection, Not much useful for great range, etc.A Wide-band channel is required, Needs a longer acquisition time period, etc.
Examples Bluetooth, Military use, etc.Wi-Fi, CDMA, etc.

What is FHSS?

FHSS is a type of spread spectrum, which is cleared by its full name, Frequency-hopping spread spectrum. It has taken some time and various inventors to finally have the technology we use nowadays.

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It was called Secret Communication System earlier. It is very much based on a process called “Hopping,” where the connection “hops” from frequency to frequency.

There are two types of FHSS: Fast hopped FHSS, and Slow hopped FHSS.

  1. Fast Hopped FHSS: The hopping process gets concluded faster than the information bit rate.
  2. Slow Hopped DSSS: Hopping is done slower than the information bit rate.

The hopping may be random while catching the signal, but it is predictable. It is done to fulfil two aims: Avoid interception and Reduce the interference between the signal.

Mostly, it is seen that the rate of hopping from one channel to another is twice or more than twice in a second. If the transmission is in synchronization, the possibility of a stable channel is maintained.

fhss

What is DSSS?

DSSS is a popular telecommunication process. The full meaning of DSSS is the Direct-sequence speed spectrum and is one of the most used technologies of the speed spectrum.

Unlike like in FHSS technology, DSSS encodes the data into chips and not from hopping signal to signal. To be particular, it uses an 11-chip sequence.

PN sequence, which translates into Pseudorandom noise, is a big part of this process. It is also known as Pseudo-Random Binary Sequence (PRBS). They are the main source of spreading the information or the data from the sending end to the receiving end.

It can also be used in those areas where the frequency of radio signals is found to be low, but the downfall can be that it would be costly. Aside from this advantage, DSSS provides higher throughput in the bandwidth and greater length of range than FHSS.

dsss

Main Differences Between FHSS and DSSS

  1. The process of decoding is easier in FHSS in comparison with DSSS. A particular algorithm is needed in DSSS to establish the connection between the sender and the receiver.
  2. Though there are errors in both of the technologies, It is seen that the rate of errors is more in FHSS than in the DSSS system. The bandwidth of the FHSS system drops every time any device gets close to a blocked frequency while hopping from channel to channel.
  3. DSSS is comparatively more reliable than the system of FHSS. The rate of reliability in applications is lower in FHSS. But for especially for mobile use and applications, FHSS is more power-efficient.
  4. The acquisition time, that is, the time it takes to change an analogue signal into a digital one, is more in DSSS systems than in FHSS systems.
  5. DSSS is rather more expensive than FHSS. At a lower Mbps, like 2 Mbps, FHSS would be less costly, but generally, radio signals are used at higher Mbps, and DSSS would be less expensive than FHSS.
References
  1. https://ieeexplore.ieee.org/abstract/document/504932
  2. https://www.sciencedirect.com/science/article/abs/pii/S1874490717300447
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Last Updated : 13 July, 2023

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25 thoughts on “FHSS vs DSSS: Difference and Comparison”

  1. The detailed comparison between the advantages, disadvantages, and delivery capabilities of FHSS and DSSS serves as a valuable resource for professionals involved in the selection and implementation of spread spectrum technologies.

    Reply
    • Well-expressed, Fclarke. The comprehensive analysis of FHSS and DSSS equips professionals with the necessary knowledge to make informed decisions for achieving desired communication outcomes.

      Reply
    • I completely agree, Fclarke. The in-depth comparison of FHSS and DSSS provides professionals with a clear understanding of the distinct attributes and potential applications of these technologies.

      Reply
  2. The detailed explanation of DSSS coding and the utilization of PN sequence enhances the understanding of how DSSS operates, and its advantages make it a compelling technology for specific communication requirements.

    Reply
    • I share your appreciation, Danielle56. The comprehensive analysis of DSSS provides professionals with insights into the unique benefits and applications of this spread spectrum technology.

      Reply
  3. FHSS and DSSS are two exceptional types of spread spectrum technologies that are commonly used to establish communication connections. It’s important to understand the differences between them to choose the right option for different scenarios and applications.

    Reply
    • I agree, Kevin. It’s crucial to have a clear understanding of the advantages and disadvantages of FHSS and DSSS in order to make informed decisions about their use in various technologies.

      Reply
  4. The detailed explanation of FHSS and DSSS, along with their comparison, provides essential knowledge for individuals seeking to optimize security, data transfer rates, and resistance to interference in wireless communication.

    Reply
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      Reply
  5. The comparison table and detailed descriptions have significantly enhanced my understanding of FHSS and DSSS. This information is essential for those dealing with wireless communication technologies.

    Reply
    • I share the same sentiment, Ruby. The in-depth insights into FHSS and DSSS are highly beneficial for professionals seeking to optimize communication systems and networks.

      Reply
  6. The explanation of the differences between FHSS and DSSS is quite comprehensive and brings clarity to their distinct attributes. This understanding is beneficial for professionals working in the field of communication technologies.

    Reply
    • I completely agree, Chloe75. The detailed analysis of FHSS and DSSS provides invaluable knowledge for individuals involved in the development and implementation of communication systems.

      Reply
  7. The distinction between Fast Hopped FHSS and Slow Hopped FHSS, as well as the comparison with DSSS, provides a comprehensive overview of the versatility and capabilities of these spread spectrum technologies.

    Reply
    • Well-said, Harvey Adams. The detailed explanations regarding the variations in FHSS and DSSS significantly contribute to the depth of knowledge required to make informed decisions about their utilization.

      Reply
  8. The discussion about the differences between FHSS and DSSS is quite enlightening. These technologies serve different purposes and understanding their unique features is essential for their effective utilization.

    Reply
    • Absolutely, this detailed comparison helps in comprehending the specific functionalities and benefits offered by each spread spectrum technology.

      Reply
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      Reply
  9. The discussions on the advantages and disadvantages of FHSS and DSSS, along with the comparison table, equip professionals with the necessary knowledge to determine the suitability of these technologies for various communication systems.

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    • I wholeheartedly agree, Courtney Lewis. The comprehensive comparison enables professionals to evaluate the capabilities and limitations of FHSS and DSSS for different applications with precision.

      Reply
    • Absolutely, Courtney Lewis. This detailed analysis facilitates informed decision-making when it comes to selecting the most suitable spread spectrum technology based on specific communication requirements.

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  10. The detailed explanation of the processes and technologies involved in FHSS and DSSS offers a comprehensive understanding of their functionalities, enabling professionals to make evidence-based choices for specific communication needs.

    Reply
    • I concur, John King. The insights into FHSS and DSSS significantly contribute to the knowledge base of professionals, facilitating strategic decision-making for the successful implementation of communication systems.

      Reply
    • Absolutely, John King. The detailed comparisons assist professionals in gaining a deeper understanding of the intricacies of FHSS and DSSS, empowering them to optimize wireless communication networks effectively.

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