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Results tagged with digital-communications
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user 7926
Digital Communication is the physical transfer of data (a digital bit stream) over a point-to-point or point-to-multipoint communication channel.
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does scrambling increse the bandwidth
In LTE systems the in the scrambling section, a gold sequence is used. But I've studied that gold sequences are used in spread spectrum communication. This generally increases the bandwidth. So doesn' …
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spread spectrum communication in airport
Does anyone know , how the spread spectrum sequences are used in airports. I've attended a presentation this morning regarding spread spectrum in my college, the author mentioned that the sequences ar …
- 450
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what are the advanatages of using a scrambler
What is the purpose of using a scrambler in communication systems?
The link wiki_for_scrambling says that it is used to randomize data. But the data is already random (like speech,audio,video,etc..), …
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586
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what is the relation between bandwidth and channel taps
I've studied that when the bandwidth increases, the number of taps we consider for channel modelling increases(example in WLAN or LTE). why is that happening. why signals with lower bandwidth (example …
- 450
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cyclic prefix in ofdm
In ofdm systems after applying IDFT we take the last N/x samples and place them before these N samples. This is called cyclic prefix(CP).So why to use a cyclic prefix?
Why is the CP known to combat t …
- 450
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331
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PAPR in the SC-FDMA system
in wireless communication,compared to the OFDM system , why does the SC-FDMA (single carrier FDMA) system has a lower PAPR (peak to average power ratio)?
regards,
phani tej
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what is the significance of pilot carriers in ofdm [duplicate]
in an OFDM system having a radix two FFT (Say N=64) . all of these sub-carriers are not utilized. while some of the carriers are nulls to prevent leakage in to adjacent bands, say a four to five carri …
- 450
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235
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sampling a signal below nyquist rate
This question is for people working in multi rate signal processing. Using compressive sensing techniques, we can still recover a signal by sampling below nyquist rate(by decimating the signal). How i …
- 450
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3k
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What is the significance of the DFT in SC-FDMA systems? [closed]
Long term evolution (LTE) systems use single-carrier frequency division multiplex (SC-FDMA) in the uplink. In such a system, there is a DFT block and a sub carrier mapping block before the IFFT block. …
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229
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Omission of 8-PSK and 32-QAM in LTE/5GNR
In 4G LTE/5G NR, the modulation schemes 8-PSK (which is an intermediate scheme between QPSK and 16 QAM) ,32-QAM (which is in between 16 and 64 QAM) are omitted. If the channel is bad , or the distance …
- 450
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Is multirate signal processing involved in ADSL?
Telecom companies offer different data rates for home/office purposes depending on the money they pay.
How are the telecom people able to control the flow of data of different cables?
Say supposing …
- 450
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OFDM transmitter bandwidth
Remember that OFDM is a time limited system. And because of that you have infinite components in the frequency domain ideally.
If you are not using nulls in the frequency domain, then you are not us …
- 450