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How can I develop an application using your code?
Our source code is for waveform generation of LTE uplink signals. It is written in Microsoft Visual C++.
It is designed for users who want to create programs for creating LTE uplink waveforms. Rather than write
the waveform generation and the graphical user interface (GUI) and a hardware interface, you can save
yourself some time by using our code for the waveform generation. The licensing terms are very flexible,
you do not need to pay anything or even mention that you are using our code.
What are the advantages of
subscribing to Spectro LTE Gen?
Our Spectro LTE Gen software is for people who do not want to write the graphical user
interface (GUI) or hardware interface. It uses the same waveform generation algorithms which we make
available in the source code file. In addition to generating waveforms, we have numerous tools included
in Spectro LTE Gen like a spectrum analysis tool, an EVM measurement tool and a modulation tool.
Do you have an example program?
We include with the source code a simple command line example of how to use the code. You could compile
and link a simple program to generate a waveform and save it to a file. That file could be compared to
a file created by a different program (your code). Or, you could send it to a vector signal generator to
produce an actual RF signal.
Is your software is useful for those developing hardware?
Yes, our code is designed for people developing their own physical chain, in that it allows you to compare
the results of a physical chain with an ideal physical chain. You can use our software to create waveforms
to compare with those coming from a physical chain implemented in hardware. Looking at the source code can
aid in understanding how LTE waveforms are constructed. This can help during hardware development, by giving
an example of LTE waveform generation, albeit in software.
What are the inputs to and outputs from the code?
The reason that we make source code available is to allow the waveform generation to be used in a variety
of ways. At present, it accepts a bit stream as a char array and outputs a complex (I & Q) waveform
array. By adding your code around it, you can make it handle your bit stream rather than our various types
of random bit streams. The main C++ object that your code interacts with is called CWLTEPUSCHFrameGen. That
object has this method:
void Generate(char* bits_ptr, int num_bits, int num_slots);
Just give it a char array of bits (one bit per char) of length num_bits. The argument num_slots tells the
object how many slots of data to generate (20 slots per frame). In our example, we generate random bits and
pass them to the waveform generator, but you can pass it any bits that you want.
Can we see what the waveforms look like with your software?
The source code is only for waveform generation. However, Spectro LTE Gen currently handles both waveform
generation and waveform measurement, but it does not accept waveforms from other sources (like a file
or instrument).
Do you offer an evaluation license or trial addition?
The source code is available at no cost. All you have to do is download it from our website. You can change
the source code or use it in any way that you want. If you want a Windows program for LTE waveform generation,
with many interesting features, we offer Spectro LTE Gen. It is available for download from
our website. You must subscribe on a month-to-month basis using a credit card. To be clear: you pay for one
month’s worth of use of Spectro LTE Gen. If the program is useful, you can renew for another month. If it is
not useful, you just let the subscription end.
In summary, we are trying to provide two resources. First, we have a program for LTE uplink waveform generation
called Spectro LTE Gen. This program is available to use on a month-to-month basis through a subscription on our
website. Second, we make available the source code which is used to turn bits into I and Q waveforms. This is
available for free. You can use the source code in any way that you would like.
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