Questions tagged [simulink]
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28
questions
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0answers
11 views
Very stiff state space matrices after linearizing my Simscape model
I want to simulate and build a furuta pendulum from scratch as a project. Currently I´m having some difficulties with the simulation of my model in Simscape and I can´t figure out what´s wrong with it....
2
votes
1answer
67 views
How to improve accuracy while converting floating point coefficients to fixed point in the case of an all pole IIR filter
I am having an all pole IIR filter of order 5 with floating point filter coefficients
...
1
vote
1answer
48 views
How to get Step Response from an Impulse Response in Simulink?
Im sorry if it seems like a trivial question but I am confused right now. Im currently watching my professors lecture. And he basically has $\lambda(t)$ as ...
0
votes
1answer
30 views
Complex Data type not accepted in Simulink
I am having an issue with the interaction of the Matlab function block in the Simulink with my model block. Below you can also find the picture.
I have created a Matlab function with three inputs and ...
0
votes
1answer
19 views
What channel model to choose while simulating a system in passband with frequencies over GHz range?
I was wondering as to what kind of channel model do we use to test for BER vs SNR in a passband RF system. The system that I designed is basically a wideband frequency hopped OFDM system where I use ...
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0answers
15 views
Feedforward disturbance signal compensation
The reference Feedforward control concepts through Interactive Tools says, to minimise the effect of the disturbance $d$ on the process output $y$, a compensator $G_{\text{ff}}=P_3/P_1$ shall be used. ...
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2answers
70 views
A Practical Method for Correcting Phase Errors in a Transceiver System Comprising of OFDM + DUC and DDC
I am back with a question related to my OFDM Transceiver System that I am designing where I use DUC and DDC. I could get rid of the high BER problem. I realized that the problem was due to the phase ...
0
votes
1answer
20 views
How do we know the receiver delay in an OFDM transceiver system?
I was simulating a simple OFDM transceiver system without a channel (just the transmitter and the receiver directly connected). I saw that if I use the "Find Delay" block in Simulink between the ...
1
vote
0answers
8 views
Model of modulator and demodulator in Simulink. Why is MER so lowest?
I created a simple model in Simulink of a quadrature modulator, amplifier and quadrature demodulator. On the oscilloscope(scope in Simulink) and spectrum analyzer the displayed results look normal (at ...
0
votes
1answer
57 views
Help in designing filter for DUC (Digital Up-Converter) and DDC (Digital Down-Converter) using the built-in DUC and DDC blocks in MATLAB Simulink
Can anyone please help me in simulating a simple BPSK transceiver system that correctly receives a signal through a DUC and DDC? I have attached the screenshot of my Simulink system along with ...
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28 views
QPSK matlab/simulink Quantisation effects
I am trying to simulate the effects of quantization of an ADC on different waveforms (e.g. QPSK,8PSK) in Simulink.
For the case of QPSK the default BER curve would be generated with 2 bits per symbol ...
2
votes
0answers
43 views
Simulink cross correlation issue
here is the Simulink model that i'm using :
The matlab function script :
function tau = fcn(sig,refsig)
tau = gccphat(sig,refsig);
The errors :
2
votes
0answers
124 views
Understanding and converting Matlab's coarse frequency compensation function
I am trying to understand and convert to C Matlab's coarse frequency compensator the documentation for which can be found here: Documentation
Matlab's design itself is based on this IEEE paper: ...
1
vote
1answer
76 views
Understanding Matlab's Automatic Gain Control function
I am trying to understand the automatic gain control block provided by the communications toolbox. The documentation is here: Documentation
My questions are in regards to two of the configurable ...
1
vote
1answer
122 views
Length of Matlab Raised Cosine Filter Output Complex Vector
If I instantiate in Matlab a filter, a vector, and use them in the following way:
...
0
votes
1answer
88 views
Translating Matlab scrambler function to C
I am trying to implement the following matlab function in c:
Mathworks scrambler Function Documentation
This is the code I've written:
...
3
votes
0answers
62 views
Role of Riccati Equations in Kalman Filter Design
I am working on a Kalman Filter (KF) design problem and I am struggling to understand the role of the Riccati equations in the design process of a KF.
Some sources discuss the importance of Riccati ...
0
votes
1answer
1k views
How to model state space for complex valued system correctly in SIMULINK (MATLAB)?
When trying to use the default state-space model block, if there is a complex number valued in the matrices, there will be an error
To resolve that, firstly I need to look at pseudo reference model ...
0
votes
1answer
216 views
“Revolving” QPSK Constellation
I am trying to code a QPSK transmitter in VHDL but first I want to create one out of Simulink blocks and translate it into VHDL code. I am using an example project for the PlutoSDR as a guide.
This ...
1
vote
1answer
262 views
DFT (FFT) of Non Uniformly Sampled Signal
I am trying to perform an FFT of a non-uniformly sample signal. My input comes from Simulink and PLECS which uses variable-time solver.
So far, I have used ...
0
votes
0answers
74 views
Plot Background Noise
I am a total newbie in signal processing.
I have been trying to plot on simulink a time/frequency domain noise in PLC (Powerline Communication) that matches a real-world research "...
0
votes
1answer
22 views
How do I simulate a purely real signal being received on multiple antennae in an array?
I have a signal created at baseband and then transmitted as $$\Re\{s_{bb}*e^{2\pi f_ct}\}$$ which is then received at a 5 element array for further processing. How do I interpret the real signal at ...
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0answers
12 views
variable factors in Simulimk
In my simulation of an equation in Simulink, I need to have variable factors the same as shown in following picture but Simulink doesn't accept that. how I can solve this problem?
0
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1answer
1k views
How to implement a $1$-bit quantizer in Simulink?
I am trying to implement a delta-sigma modulator block diagram in Matlab Simulink but can't find a $1$-bit quantizer (which is required in the modulator) anywhere. Could anyone please tell me how to ...
-1
votes
1answer
670 views
Signal envelope
I have a relatively low-frequency signal and want to calculate the peak envelope of it in Simulink. I tried some of filters but the envelope is not well precise. can anyone help, how can I do it?
0
votes
1answer
213 views
Amplitude value after a Discrete-Time integration calculation?
I am using Matlab block Discrete-Time
Integrator on Simulink and I would like to know in advance, what output of that block regarding to its amplitude and the current sampling frequency would be.
...
-1
votes
1answer
200 views
signal saturation [duplicate]
My signal is an actuator displacement signal. It is a sinusoidal signal with the max amplitude of 10cm. I want to clip amplitude at 7 cm in Simulink. But with saturation block, I will get flat ...
5
votes
2answers
3k views
Inverse system in Simulink
I have the following inverse system
$$G(s)= s^2 + 2s + 3$$
How do I implement it in Simulink? Note that the transfer function is only accepted if and only if the order of the numerator is less than ...
