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Results tagged with channel
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user 21048
A channel for communication between transmitter and receiver. Sometimes a channel is multi-input/multi-output, allowing for multiple transmitters and multiple receivers.
1
vote
Accepted
How do you model the channel between a satellite(LEO) and a ground station?
standard free-space path loss model is likely sufficient, and then add to that the implementation losses, antenna gain, atmospheric loss, receiver noise figure and modulation accuracy (EVM) to the overall channel … Yes there will be Doppler offset but that is not part of the channel model, but added to the budget for range of frequency error to be determined during acquisition. …
- 55k
1
vote
Accepted
What is meant by channel knowledge? Difference between partial and full?
Partial channel information is knowing some but not all of the information about the channel. … transmitters knowledge of the channel is from a feedback from the receiver where we would have a delay that is competing with the rate of change of the channel characteristics. …
- 55k
0
votes
Accepted
Detect active channel used in a lora network
CSS is "Chirp Spread Spectrum" so you need to dechirp the waveform first (multiply with a complex conjugate locally generated frequency chirp) and then demodulate the waveform using M-ary Frequency Sh …
- 55k
2
votes
Accepted
Can Oversampling help to mitigate the effect of additive white gaussian noise?
Oversampling will not do anything to change the existing noise in the waveform other than the quantization noise that is added. Sampling does not change the waveform but the quantization process of sa …
- 55k
0
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Channel impulse response (CIR) and OFDM relationship
Regarding Question 2: If the channel impulse response was real, then this would necessitate that the resulting channel distortion as a frequency response be symmetric about the carrier (complex conjugate … A simple example of a necessary complex channel is a passband magnitude slope across the channel. …
- 55k
2
votes
Why does altering path length in radio transmission alter the phase of the received signal?
If the channel has a dielectric constant higher than free space given by $\epsilon_r$, the wavelength will be decreased by $1/\sqrt{\epsilon_r}$. …
- 55k
3
votes
Accepted
Simulating Es/N0 by adding noise to analog signal
$E_s$ would be the energy of the channel symbols at the output of the matched filter as scaled by the path loss between transmitter and receiver as long as all timing and carrier offsets have been corrected … for and channel equalization completed - consider how after matched filtering with carrier and timing offsets removed we use just one sample per symbol at the symbol decision. …
- 55k
6
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OFDM use a pulse shaping filter or not?
The purpose of pulse shaping filters is not to overcome ISI as is implied in the OP's question. The only reason for using a pulse shaping filter is spectral efficiency, and in the process ISI can be i …
- 55k