PathSim is a program that can be used to simulate radio propagation paths using a soundcard and/or wave files as the source and destination.
The main screen is fairly descriptive of the signal processing paths. Three HF paths are available though usually only two are used.
Each simulation “session” can be titled and saved to a file for future retrieval. A set of canned simulations are included in this zip file and are somewhat standard test conditions.
The real input signal can come from either the soundcard or a wave file. It is first bandpass filtered and converted to an I/Q complex signal using a Hilbert transform(incorporated in the bandpass filter). Three paths are then created with two of them having a variable time delay.
Each Path has a Spreading frequency selection and a frequency offset parameter. The spreading is performed by low pass filtering a complex AWGN signal to the desired bandwidth and then multiplying by the incoming complex signal.
Each path also has a frequency offset function which is just a complex NCO that is multiplied by the incoming signal.
Just the I or real term of the three paths are summed together to create a real output.
Basically here’s how the S/N ratio is achieved. The AWGN source is filtered by a 3KHz LP filter to bandwidth limit the noise. The input signal’s rms “voltage” is measured and averaged over a second or so.
There are two gain/attenuator blocks that are varied to achieve the desired S/N ratio in dB. The noise and signal are then added to produce the final output signal. A small fft and realtime output plot are available to monitor output signals. The time plot turns red if you are overdriving the 16 bit soundcard/wavefiles.
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PathSim is designed to create reasonably realistic radio propagation paths. These paths can be saved, viewed or manipulated.
The paths can be viewed using three screens:
The main screen is a fairly descriptive description of the path that contains the data for creating the path.
The path itself is one of three or four possibilities.
The path can be a:
= Short range hop
= Long range hop
= Path spreading, that is adding a complex AWGN signal to a sine signal (used for HF and AM)
= Path offset frequency (used for AM)
The user can select an S/N ratio (delta dB) for the input signal and the output signal (dB). The user also can select the type of path (station, hop, etc.), the simulation frequency and the path spreading, etc.
The paths created can be saved to a file (with multiple paths saved) or copied to the clipboard.
The source of the paths can be soundcard/wave files or the user can use the soundcard/wave file inputs directly.
= PathSim can be run from a DOS prompt.
= PathSim allows for multiple paths to be created.
= PathSim allows for a time delay to be put into the path.
= PathSim allows for path spreading (add complex AWGN and sine input)
= PathSim allows for path offset frequency (am)
= PathSim allows for path gain/attenuation
= PathSim allows for path S/N ratio (delta dB)
= PathSim allows for 3 paths to be simulated at once
= PathSim allows for dB output
= PathSim allows for I or R output
= PathSim allows for realtime output to show path shape
= PathSim allows for path shape (i.e. relative amplitude)
= PathSim can save the paths to a file
= PathSim can create 2 outputs, one with I/Q amplitude and one with real/imaginary
= The path’s I/Q amplitude plot is very simple to understand and a “ramp” method can be used to see how much the I/Q amplitudes will be boosted/attenuated
= The path’s real/imaginary plot is complex and difficult to understand.
= PathSim’s 3 paths all have similar parameters so the I/Q plot from PathSim is basically the same as what you would get from a path sim program.
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*PathSim is a simple HF radio propagation simulator. You can simulate paths with different spreading frequencies, delays, and frequency offsets. Each path has a time delay so you can simulate fading and ghosting. The paths can have variable gains, frequency attenuations, and bandpass filters.
*PathSim is based on PCM8000. In addition, you can define both I and Q signals as path inputs.
*You can simulate paths using wave files, soundcards, and the program can use multiple soundcards.
*The program can run in Windows XP, 2000, or 98. It is written in Visual C++ 5.0.
*I have tested the program on Windows 98SE, Windows 2000, and Windows XP.
*The source code of this program can be downloaded from my web page,
*There is a release of the program which is totally free and open source. You can check the URL for the source code on my web site.
*There are 24 default paths and 8 extra paths available in the main menu of the program.
*You can save the simulation sessions to disk. A box pops up asking you to enter a title, a path, a frequency offset, and a spreading frequency.
*There are options to choose if the program runs in real time or does a single sweep of the signal.
*The frequency offset and spreading frequency can be specified as: real part of frequency, real part of frequency minus offset, real part of frequency minus offset and the imaginary part of the frequency or, the imaginary part of the frequency minus offset.
*The input soundcard and wave files are low pass filtered at the spreading frequency before the program processes them.
*The default soundcard is a 16 bit Yamaha sound card and a 16 KHz sampling rate. The bandwidth is 3KHz.
*The default input wave files have frequencies between 2.5 KHz and 6.5 KHz.
*The frequency offset is the real part of the input frequency minus a fixed offset.
*The spreading frequency is the frequency where the spreading begins.
*It is simply the input frequency times the spreading rate.
*It is specified as the real part of the input frequency or, the real part of the input frequency minus the spreading offset.
*The spreading offset is the real part of the spreading frequency minus a fixed offset.
*The input soundcard can be muted with the mute
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Simulates paths using a soundcard/wavefile as the input, two paths, a frequency offset and a time delay.
Both the frequency offset and time delay can be varied in steps. A real time display is available in this mode as well.
Simulate arbitrary paths with the ability to create intermediate stages.
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An introduction to the Matlab FFT convolution functions including example plots of the results.
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What’s New In PathSim?
PathSim simulates the propagation of radio wave through a surface of any two
items. Each path has various frequency and time delay factors
and a path selection in BPSK, QPSK, MSK, GMSK, GMSK-C1, GMSK-C2.
Additional parameters are:
Band Pass Filter
Noise Filter: If the noise filtering is used, the input signal is filtered before the noise
The input signal.
The additive noise in the input signal.
The type of digital filter to be used. These filters are taken from:
(top of page)
Time Delay: The delay times in time or fraction of time the path requires.
These times are specified in milliseconds.
Spread Frequency: The type of spreading to be used.
These are listed from the above link
You can also choose the S/N ratio to be displayed. A 20dB s/n is an easy
way to set the amplitude of the signal.
If your audio card has more than 16 bit depth, then there are two choices:
• When the input signal is a 16 bit wide wave file, the output signal is
a 16 bit audio signal. The output has the same resolution as the input
• When the input signal is a 16 bit wide sound card, the output signal is
a 16 bit audio signal. The output has the same resolution as the input
You can select if the file should be converted to a 16 bit wide file or if the
input and output are both 16 bit wide. This may also affect the file size.
The main window contains three paths.
You can adjust the filtering parameters, the time delay, and the
frequency offset for each path.
The first path is the “Noise Filter.”
The second path is the “Additive Noise.”
The third path is the “Digital Filter.”
The “Additive Noise” path has three options to control the noise.
Select the option that has the best S/N ratio for your application.
1. No Filter. This is the “No Filter” mode. The noise is added directly to
the input signal. If the input signal is a 16 bit wide signal,
the noise will be 16 bit wide as well.
2. Low Pass Filter.
This low pass filter is used to reduce the amplitude of the noise
signal. The pass band is controlled by the parameter “Noise Filter Band.”
The cutoff frequency is controlled by the parameter “Noise Filter Cut
Windows XP, Vista, 7, 8, or 10 – 32bit or 64bit (minimum 2GB RAM)
Scribus 1.5.6 or newer (only version and/or release date included in the download)
Extract the tarball into Scribus 1.5.6 folder (creating a new folder if necessary)
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