MSK constellation

[Aht22]

 I am new in labview. I want to Implement GMSK Transceiver in labview .kindly suggest how can i implement Gaussian MSK. kindly suggest any document or VI. your help in this regard is highly appreciated. thanks in Advance.

[Aht22]

how to make a GMSK modulation and demodulation  in labview? 

or change the msk modulation in GMSK?

[Air_Frantz]

Hello,

The NI Modulation toolkit supports GMSK modulation schemes and can be used to build or demodulate data.  You can download the Modulation Toolkit here:

https://www.ni.com/en-us/support/downloads/software-products/download.modulation-toolkit.html

There are a few examples for MSK, I believe all of them include the option of using a Gaussian filter.

[Aht22]

thanks Jon  for you help.

can you talk about the pulse shaping filter in MSK examples.please see the screen shot and reply me...

[aptivo]

There is an article white paper available from NI:

https://www.ni.com/de-de/innovations/white-papers/06/pulse-shape-filtering-in-communications-systems...

[Aht22]

hi,

is there any extra filter is used to mod or demod the GMSK or  MSK example in modualtion tool kit 15 is available is used as a gmsk.

i am little bit confuse in this...

i am using labview 2015, and modulation tool kit 15

operating system windows 7 ultimate

[Air_Frantz]

My understanding of GMSK is that it is very similar to regular MSK except that the data stream is sent through a Gaussian pulse shaping filter to increase spectral performance.  So when choosing Gaussian for the filter type in the Mod toolkit example, you are applying this filter and thus implementing GMSK.

[Aht22]

thanks Air Frantz,

according to your opinion there is no other filter is used,just select filter type from none to Gaussian to implement the GMSK and receive GMSK signal ??? 

[Air_Frantz]

That is what I understand about the modulation scheme.  I've not worked with GMSK specifically, but I've found many documents online which explain the scheme in detail.  This was a helpful one for me:

http://sss-mag.com/pdf/gmsk_tut.pdf

[Aht22]

hello everyone,

i want to implement MSK transmitter and Receiver, for this i transmit a signal and Receiver on USRP 2920, but the garbage bits are received and if   i dont transmitt data but  i transmit data also a contentiously changing bits are received and BER is 1. whats the issue

your help in the regards is highly appreciated,

thanks in Advance.