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Identify the spread spectrum technique that multiplies the original data signal with a pseudo random noise spreading code.
Suggested Answer: B
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The spread spectrum technique that involves multiplying the original data signal with a pseudo-random noise spreading code is known as Direct Sequence Spread Spectrum (DSSS). In DSSS, the data signal is combined with a higher data-rate bit sequence, also known as a chipping code, which divides the data according to a spreading ratio. The chipping code is a pseudo-random code sequence that spreads the signal across a wider bandwidth. This process allows the signal to be more resistant to interference and eavesdropping.
37 comments · newest first
SA
Samuel
10 months ago
I thought FHSS was more common, but DSSS makes sense.
CE
Ceola
10 months ago
Wait, isn't OFDM also a spreading technique?
HE
Heidy
11 months ago
Really? I always thought DSSS was just for specific applications.
MA
Marica
11 months ago
Totally agree, it's the right answer.
AL
Allene
11 months ago
It's definitely DSSS!
OL
Oliva
11 months ago
I’m not confident, but I feel like ISM is more about frequency bands rather than a spreading technique.
SH
Shayne
12 months ago
I’m leaning towards DSSS too, but I keep mixing it up with OFDM. They both seem related to spreading techniques.
DA
Dallas
12 months ago
I remember practicing a question like this, and I think FHSS was mentioned as well, but it uses frequency hopping, not a spreading code.
PO
Pok
1 year ago
I think the answer might be DSSS since it involves spreading the signal with a pseudo random noise code, but I’m not completely sure.
DO
Dominga
1 year ago
Wait, I'm a little confused. Isn't OFDM also a spread spectrum technique? I'll have to review my notes to make sure I understand the differences between these methods. Gotta be careful on this one.
DO
Domitila
1 year ago
Okay, I think I've got this. DSSS is the technique that uses a pseudo-random code to spread the signal across a wider bandwidth, right? That matches the description in the question. I'm feeling pretty confident about this one.
JU
Jules
1 year ago
Hmm, I'm a bit unsure about this one. The options seem pretty technical and I'm not totally familiar with the different spread spectrum techniques. I'll have to think it through carefully.
DE
Delmy
1 year ago
This one seems pretty straightforward. The key is that the question mentions multiplying the original data signal with a pseudo random noise spreading code, which sounds like the definition of DSSS (Direct Sequence Spread Spectrum).
AR
Arthur
1 year ago
You know, if this was a trick question, I'd say C) OFDM just to mess with the instructor. But in reality, B) DSSS is the correct answer, no doubt about it.
RE
Remona
1 year ago
Yeah, DSSS multiplies the original data signal with a pseudo random noise spreading code.
LA
Lavera
1 year ago
I agree, DSSS is the correct spread spectrum technique.
AZ
Azzie
1 year ago
I think the answer is B) DSSS.
RO
Rolande
2 years ago
Hmm, OFDM is for multi-carrier transmission, not spread spectrum. And ISM is just a frequency band, not a technique. B) DSSS is the winner here!
VI
Vincenza
1 year ago
And ISM is just a frequency band, not a technique.
BR
Brunilda
1 year ago
Hmm, OFDM is for multi-carrier transmission, not spread spectrum.
PE
Pete
1 year ago
Yes, DSSS is the spread spectrum technique that multiplies the original data signal with a pseudo random noise spreading code.
ED
Edison
1 year ago
I think B) DSSS is the correct answer.
AN
Annabelle
1 year ago
Yes, you're right. DSSS is the spread spectrum technique that multiplies the original data signal with a pseudo random noise spreading code.
KR
Kristofer
1 year ago
I think B) DSSS is the correct answer.
CA
Cassie
2 years ago
I'm not sure, but I think FHSS is also a spread spectrum technique. Can someone explain why DSSS is the correct answer?
RY
Ryan
2 years ago
I agree with Emeline, DSSS is the spread spectrum technique that uses pseudo random noise spreading code.
BA
Barrett
2 years ago
I'm pretty sure FHSS is the one that hops around the frequency spectrum, not DSSS. B is the right answer for sure.
RA
Rashad
1 year ago
Got it, thanks for clarifying!
AR
Art
1 year ago
So, B) DSSS is the correct answer.
MA
Mauricio
1 year ago
Yeah, DSSS is the spread spectrum technique that multiplies the original data signal with a pseudo random noise spreading code.
AD
Adolph
1 year ago
I think FHSS is the one that hops around the frequency spectrum.
AN
Antonio
1 year ago
DSSS is the spread spectrum technique we're looking for.
VE
Veta
1 year ago
So, the answer is definitely B.
EL
Elden
1 year ago
Yeah, DSSS multiplies with pseudo random noise spreading code.
FR
Francoise
1 year ago
I think you're right, FHSS hops around frequencies.
LA
Lavina
2 years ago
B) DSSS is the way to go! Spreading the signal with a pseudo-random code is the essence of direct sequence spread spectrum.
EM
Emeline
2 years ago
I think the answer is B) DSSS.