# Honglei Chen

### MathWorks

I am a developer on Phased Array System Toolbox at MathWorks

DISCLAIMER: Any advice or opinions posted here are my own, and in no way reflect that of MathWorks.

Professional Interests: Signal Processing, Array Processing, Radar, and Communication

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**Feeds**

How to optimize the antenna weight of a two-dimensional array to generate null in a specific direction

Your script is pretty close, you just need to set up the desired response properly. However, you could take advantage of the pat...

5 months ago | 0

how get the range from FFT on FMCW radar data

You may want to look at the following example, especially the "Range and Doppler Estimation" section. It shows how to extract th...

6 months ago | 0

phased array antenna simulation

You can set the ArrayAxis in phased.ULA to 'x' to achieve that. Hope this helps

6 months ago | 0

How to modify the response of a antenna element with respect to different opearting frequency in the specified frequency range?

As Manikanta mentioned in the comment, you can set up a phased.CustomAntennaElement to specify a pattern that is not constant ac...

6 months ago | 0

Ti 6843 mmWave sensor - How can I get micro-Doppler?

TI6843 itself does not have capability to output raw data. It only outputs the processed data. Therefore, as is you cannot deriv...

6 months ago | 0

Relationship of array factor and directivity for an antenna array

I agree with your array factor definition but I don't quite follow your reasoning on normalization. I don't think there should ...

7 months ago | 0

Anyone has TOPS model in WideBand Signal DOA?

There is no off the shelf TOPS algorithm implementation in MathWorks offering, but there are tools in Phased Array System Toolbo...

7 months ago | 0

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What is the difference between Signal Processing Toolbox and DSP System Toolbox R2023a?

While Signal Processing Toolbox supports performing signal processing and analysis (resampling, power spectrum estimation, visua...

1 year ago | 2

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Getting steered beam gain in Phased Array Toolbox

Hi Peter, Happy new year! The pattern() computation does take into consideration of beam broadening. However, uniform linear ar...

2 years ago | 0

Trouble in codegen customized antenna pattern

I don't know how x is formed, but here is an example you can take a look, that generates the code. The main idea is to push patt...

3 years ago | 0

Adding Tapering and Time Delay

Unfortuantely at this point there is no straightforward way to combine the element taper with time steering. At this point, I th...

4 years ago | 0

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Antenna Pattern plot Phase

Looks like you are using Phased Array System Toolbox and it currently doesn't support 'phase' as a type. We will try to address ...

4 years ago | 0

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Wideband LOS channel block - propagate to multiple destinations

Could you share how you invoked the block? My guess is your signal is a single column vector while the block is expecting a matr...

4 years ago | 1

| accepted

What is the maths behind findpeaks function on matlab?

There is no specific name for the algorithm. Essentially it looks for points that is larger than the two adjacent points. Is the...

4 years ago | 0

Phased Array Toolbox Directivity Calculation

It would be helpful if you could share which textbook theory you are referring too. Directivity is often used interchangeablly w...

4 years ago | 0

Internal error in phased array toolbox applications.

This bug has been fixed in R2019b Update 2. If you get any update later than that, it should work properly. For more details, yo...

4 years ago | 0

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epsilon-neighborhood for polar coordinates

I'll explain how clusterDBSCAN works in this situation. In your case, range and angle will be two features so you can specify e...

4 years ago | 0

Backscatter Bycicle/Pedestrian Sampling Frequency

It seems that you are tring to simulate the radar echo. In that case, I don't think you can lift that constraint. In real applic...

4 years ago | 0

FMCW 24 GHz automotive Radar mmWaves simulation (Target Range&Speed Detection)

You can just randomly generate some range and speeds based on a trajectory. For example, phased.Platform can help generate some ...

4 years ago | 0

Angle Doppler response using FFT

I notice that you are using 128th range gate for plotting. Are you sure you have the correct target there? You can try to verif...

4 years ago | 0

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Electronic steering of clutter using phased.constantgamma clutter model

This is a good enhancement request, unfortunatly at this point the electronic scanning is not supported. We'll see if we can add...

4 years ago | 0

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Can I use phased.BackscatterPedestrian and phased.FMCWWaveform to simulate wideband echo, like fc=77GHz, BW=4GHz?

There is nothing prevents you to set the bandwidth to 4GHz. The only thing you need to be cautious is that with such a bandwidth...

4 years ago | 0

Phased Array System Toolbox: DOA with MVDREstimator using output data after Range-Doppler FFTs

To perform DOA estimation, the data input has to be across number of channels, i.e., number of elements in the array. On the oth...

4 years ago | 0

Simulation of range ambiguous clutter in phased array toolbox

phased.ConstantGammaClutter simulates clutter up to the horizon range. So it already builds the range ambuity in. HTH

4 years ago | 0

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Undefined function 'helperPolarizationView' for input arguments of type 'double'.

This is a helper function for the example, so you need to open that example from MATLAB. This will copy the supporting files int...

4 years ago | 0

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Can phased.GSCBeamformer system Object run Frame by frame?

Those beamformers do main states but currently there isn't a way to export those states. Essentially, when you first run it usin...

4 years ago | 0

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What's the algorithm of the phased.rangeangle response

It depends on the system. In summary, if you use an FMCW waveform, you want to use FFT to do range processing. If you use a puls...

4 years ago | 0

Is ifft(fft(x).*fft(h)) faster or conv(x,h) ?

Time is not the best way to compare the two approaches. Rather, the best approach to describe is the computation complexity, i.e...

4 years ago | 0

The value returned from getNumInputsImpl method must be a constant value. But the Value is immutable

You said numInputs is nontunable, did you try to use Nontunable in the property defintion? Like properties (Nontunable) nu...

4 years ago | 0

Simulating Freespace power in Matlab

You can start with these reference pages https://www.mathworks.com/help/phased/signal-propagation.html? Go to Functions -> Sig...

4 years ago | 0