PAM is not very good for long-distance transmission. Why is it so?

In summary, PAM, or pulse amplitude modulation, is not a suitable choice for long-distance transmission due to its susceptibility to noise and attenuation. It has a limited transmission distance and is not as effective as other modulation techniques like PSK or FSK. However, it can still be used in certain cases, such as DSL connections, and has the advantage of being simple and achieving high data rates.
  • #1
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Homework Statement



Just came across the statement that PAM is not very good for long-distance transmission.
Why is it so?
Thanks.

Homework Equations

The Attempt at a Solution



Is it because the output is of infinite length?
 
Last edited:
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  • #2
what the heck is pam and what class is this for? (is it for applied electromagnetics with an intro to transmission line theory?)
 
  • #3
xcvxcvvc said:
what the heck is pam and what class is this for? (is it for applied electromagnetics with an intro to transmission line theory?)

Ops.

PAM = pulse amplitude modulation
for digital communication.
 

1. Why is PAM not very good for long-distance transmission?

PAM, or pulse amplitude modulation, is not very good for long-distance transmission because it is a baseband signaling technique that is highly affected by noise and attenuation. This means that as the signal travels over longer distances, it becomes weaker and more susceptible to interference, resulting in a higher error rate.

2. What is the main disadvantage of using PAM for long-distance transmission?

The main disadvantage of using PAM for long-distance transmission is that it has a limited transmission distance. As the signal travels further, the amplitude of the pulse decreases, making it more difficult to distinguish from noise. This results in a lower signal-to-noise ratio and a higher bit error rate.

3. How does PAM compare to other modulation techniques for long-distance transmission?

PAM is not as effective as other modulation techniques, such as phase shift keying (PSK) or frequency shift keying (FSK), for long-distance transmission. This is because PAM relies on amplitude changes to encode information, which is highly affected by noise and attenuation. PSK and FSK, on the other hand, use phase and frequency changes, respectively, which are less prone to these transmission issues.

4. Can PAM be used for any type of long-distance transmission?

While PAM is not ideal for long-distance transmission, it can still be used in certain cases. For example, it is commonly used for digital subscriber line (DSL) connections, where the distance between the user and the central office is relatively short. However, for longer distances, other modulation techniques are typically preferred.

5. Are there any advantages to using PAM for long-distance transmission?

One advantage of using PAM for long-distance transmission is its simplicity. PAM only requires a simple transmitter and receiver, making it a cost-effective option for short-distance applications. Additionally, PAM can achieve higher data rates compared to other modulation techniques, which can be beneficial in certain scenarios.

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