Questions tagged [channel-estimation]
The channel-estimation tag has no usage guidance.
24
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19 views
Generating a 2D delay-Doppler channel matrix
I was wondering if anyone here has any idea on 2D delay-Doppler channel and how to generate the channel matrix?
Even a hint or a resource would be helpful. I just want to understand and visualize the ...
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1answer
69 views
Understanding MMSE equalizer equation
I have read many online materials and journal paper where the equation for MMSE equalizer is given as:
$G_{MMSE}$ = $H^H(HH^H+\nu^2I )$
where $H$ is the channel, $H^H$ is its hermitian. $\nu^2$ is ...
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25 views
Unstable Phase in Channel Impulse Response
I'm using DW1000 UWB radio transceiver and extract its channel impulse response (CIR). The CIR output by the transceiver is the complex baseband CIR. In a static environment, the CIR is a LTI filter ...
0
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1answer
67 views
bit reversed order of FFT matrix for channel estimation
Although the question seems similar to this one HERE, but what I want to ask about is little bit different.
Assume we have a signal $X$ whose length is $N$x$1$, we convert that signal into time ...
1
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1answer
43 views
Channel estimation using bit reversed order of FFT matrix
Is it possible to use the bit-reverse order of FFT instead of FFT to estimate the channel?
Based on my reading, I found that bit reversed order of FFT matrix can diagonalize the channel, but ...
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1answer
56 views
time-domain channel estimation based on two vectors optimization
Let's the input data vector $X = [X_1, X_2, X_3, X_4, X_5,X_6,X_7,X_8];$ where $[X_7,X_8]$ are well known, and the vector $y = h*X$ where $*$ is the convolution operation and $h = [h_1,h_2]$ is the ...
-1
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1answer
65 views
What is the Co-channel interference in MIMO communication
I try to understand the co-channel interference occurred in MIMO systems with rich multi-path channels, but I couldn't find clear explanation about how it happens and what's its effects to the ...
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1answer
44 views
Multipath channel estimation in single carrier modulation
I think it’s a basic question, but I couldn’t get it’s clear answer. If we have data symbols $x$ vector of length $N$ x $1$ ; it’s convoluted with a multipath channel $h$ of length $L$ x $1$; the ...
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1answer
34 views
What can be a limit to the maximum possible power of a pilot signal
In practice, what can be a limit to the maximum power of a pilot signal in wireless communication?
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30 views
Unable to estimate for AR model using OLS, Yule Walker and MLE
I am learning estimation methods following the book of Steven Kay, "Fundamentals of Statistical Processing, Volume I: Estimation Theory "
Theory says that if the measurement noise is ...
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1answer
56 views
Why SRS signalling is used in 5g?
Since DMRS is also being used as a reference signal in PUCCH and PUSCH channel, so why an extra SRS signalling is required.
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25 views
Slip rate for sliding correlator channel sounder in GNU radio
I have a spread spectrum channel sounder running the following transmitter and receiver:
[![tx][1]][1]
[![enter image description here][2]][2]
Imm not sure how to modify the slip rate between the ...
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1answer
76 views
Capacity and channel estimation algorithms: explanation of results
I study a spectral efficiency of a system with a precoding scheme with different channel schemes.
Algorithm A for channel estimation gives a smaller estimation error instead of Algorithm B.
I have ...
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0answers
77 views
Compressive sensing based sparse vector estimation
I am newbie in compressive sensing (CS), I read about compressive sensing and its use for sparse vector estimation. As I understood CS can be used either in time or frequency domain. For me, The part ...
0
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1answer
51 views
channel estimation based on time-domain pillots
I am confused if it's possible to estimate the channel based on the time-domain pilots. I mean I have such signal $x$ with length $N$ after taking its $iFFT$ we get $X = ifft(x)$. I have perfect ...
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1answer
110 views
Should we upsample the channel when upsample the signal
I have an OFDM system with Number of sub-carriers $N= 1024$, modulated data using $QAM$ modulation is transmitted via those subcarriers as follows:
...
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55 views
Calculation of channel autocorrelation for LMMSE
I am currently trying to implement an LMMSE estimator/equalizer for a python based ofdm receiver. The actual reception is done with a SDR and iq-samples are stored in a file for the "ofdm-receiver" ...
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1answer
65 views
LTE Channel Estimation
I am trying understand LTE channel estimation. I have multiple questions:
How much phase shift does a typical LTE channel have?
Can all that be corrected using pilots?
Where do we typically implement ...
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1answer
110 views
OFDM pilot allocation block type and comb type
As known, the pilot insertion in OFDM can be either bock type or comb type, I think comb type is appropriate for double-selective channel while block type is for frequency selective channel:
In the ...
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0answers
44 views
Can someone explain or elaborate on the channel estimation and noise variance estimation algorithms used in HF receiver?
For different type of communication, there is different type of algorithms to acquire CSI.
For instance 4G (LTE) network have SRS or DMRS to estimate the channel based on pilots.
I am designing a ...
1
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1answer
106 views
A Delay Between Two Filtered Chaotic Signals
it is a common practice to use a shift of cross-correlation peak to evaluate a group time delay of two signals (chaotic signals are included). Can one synchronously and equally filter these chaotic ...
2
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1answer
457 views
How determine the delay in my signal practically
I am trying to practically determine filter group delay so that I can try to reduce or adjust for it. I have tried all kinds of methods but still can't get the right result. I know that theoretically ...
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3answers
372 views
How to reliably compute the group delay of a comb filter
I applied the following FIR comb filter in real-time:
y[n]=x[n]-x[n-40]
Since this is an FIR, the group delay is D=(N-1)/2=20 samples. After applying the filter ...
1
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2answers
222 views
System Identification with a Limited Bandwidth Input Signal and Region of Interest
Given a FIR filter $h[n]$. Its action can described as:
$$
\mathbf{y} = \mathbf{H} \mathbf{x} \\
\mathbf{y} = \mathbf{X} \mathbf{h}
$$
where $\mathbf{H}$ and $\mathbf{X}$ is a Toeplitz matrix.
If $h$...
