Questions tagged [fading-channel]
133 questions
2
votes
1 answer
Rayleigh fading with frequency selective fading channel
I Read in one reference that, the Rayleigh distribution is commonly used to describe the statistical time varying nature of the received envelope of a flat fading signal, or the envelope of an individual multipath component. Can Rayleigh and Rician…
Mohamed Aly
- 117
- 9
1
vote
2 answers
Why exponential decay power delay profiles are used to model fading?
I am trying to understand why exponential decay power delay profiles are used to model fading. In other words, why power of taps of channel impulse response decays exponentially and not, for instance, linearly.
The only explanation I could come up…
Pawel
- 35
- 5
1
vote
1 answer
Is time varying channels same as circulary symmetric complex gaussian?
From the literature i understood that if the channel is non time varying then we can consider it as circularly symmetric complex gaussian distributed. So can we consider the same if the channel is time varying ?
charu
- 47
- 6
1
vote
0 answers
Why are the following two packet reception probabilities different?
https://www3.nd.edu/~mhaenggi/pubs/broadnets04.pdf
In 3 page of this paper, the packet reception probability without interference is $e^{-\theta N Ad^2/ P}$. $\theta$ is sinr threshold. $N$ is a white noise. $P$ is power. $d$ is tx-rx distance and…
jack han
- 9
- 2
0
votes
2 answers
$\min(\{Z_i\})$ for non-i.i.d. random variables $Z_i$ the same as for i.i.d.?
My question is with reference to wireless communication.
There are $N$ independent and identically distributed random channels i.e., $Z_i \in \{ Z_1, Z_2,\ldots, Z_N\}$ with PDFs $f_{Z_i}(z)$ ordered in ascending order. Then using order statistics…
chaaru
- 37
- 5
0
votes
1 answer
Rayleigh fading channel as a scalar quantity
In most cases rayleigh channel is a vector. can a rayleigh channel be a scalar quantity i.e., can we have only one element in rayleigh fading channel.
charu
- 47
- 6
0
votes
0 answers
Two different models of Rician fading
The amplitude of the signal in Rician fading case is characterized by the Rician distribution (let's call this model 1). However, the received power in Rician fading is sometimes modelled as (model 2):
\begin{equation}
\label{model2}
P = q +…
Mundo
- 171
- 4
0
votes
0 answers
Channel models for wireless body area networks
To transmit a signal over wireless body area network, the signal is transmitted over a fading channel with additive white Gaussian noise. The channel model can be obtained from the IEEE standards. My question is about the range of values of the SNR…
karem Adam
- 59
- 3
0
votes
1 answer
When to use Rician fading vs Gain for Directional Antenna
This is a pretty simple question. [The answer might not be simple :( ]
If I am using a directional antenna, can I used Antenna gain $G_T=1$ as I am considering Rician Fading between transmitter and receiver?
On the contrary, if I am using $G_T>1$,…
SJa
- 151
- 1
- 7
0
votes
1 answer
How to get a Rician fading channel matrix from a Rayleigh fading channel matrix?
I have a Rayleigh fading channel matrix H. Let's say the dimension is 2000*128. Is there any way to convert this matrix into a Rician fading channel matrix for example κ = 5, 10, 15, etc.? Is there a formula for that?
Sourav Dev
- 17
- 4
0
votes
0 answers
Receiver multiple taps
I would like to implement a Rayleigh fading channel for an ASK Modulation. My question is concerning the receiver. How to properly add every tap at the receiver to keep the same length from the emitter.
For instance :
Emitter : binary frame :…
Zaertiu
- 131
- 3
0
votes
1 answer
Amplitude distribution of Rician faded complex signal
I have question regarding Rician fading simulation. I am trying to develop Rician fading channel simulator in LabVIEW, but I ran into some problems. I have complex sinusoid as my line-of-signs signal. Then I generated white gaussian noise samples…
Rob
- 1
- 1
-2
votes
3 answers
Channel modelling for wireless body area network
According to IEEE 802.15.4a
In WBAN, pulses are transmitted from an antenna , diffract around the body and can reflect off of arms and shoulders. so there are always two clusters of multi path components due to the initial wave diffracting around…
Mohamed Aly
- 117
- 9