Re: [Discuss-gnuradio] question on gmsk mod block

2007-05-09 Thread Matt Ettus
Achilleas Anastasopoulos wrote: I guess I am answering my own question here. Just realized that GMSK is defined with pulses that are indeed the convolution of Gaussian and square pulses. What a missnomer Yeah, I was bothered by that for a while. Matt

Re: [Discuss-gnuradio] question on gmsk mod block

2007-05-09 Thread Achilleas Anastasopoulos
I guess I am answering my own question here. Just realized that GMSK is defined with pulses that are indeed the convolution of Gaussian and square pulses. What a missnomer Achilleas Matt Ettus wrote: Anastasopoulos Achilleas wrote: Hi, I noticed that the Gaussian pulse is convolved with

Re: [Discuss-gnuradio] question on gmsk mod block

2007-05-09 Thread Anastasopoulos Achilleas
This does not seem right to me: The instantaneous frequency of GMSK signal is supposed to be: fi(t)=h sum_k a_k g(t-kT) where a_k is the symbol (say +-1), g(t) is the Gaussian pulse T is the symbol interval and h is the modulation index. In a discertized model with oversampling factor of Q (ie,

Re: [Discuss-gnuradio] question on gmsk mod block

2007-05-09 Thread Matt Ettus
Anastasopoulos Achilleas wrote: Hi, I noticed that the Gaussian pulse is convolved with a rectangular window in the GMSK modulator. Why is that so? The pulse is convolved with a rectangular window because the incoming data is not. For example, if you wanted to send 1011 and had 4X interpola

Re: [Discuss-gnuradio] question on gmsk mod block

2007-05-09 Thread Robert McGwier
If we need to truncate the Gaussian pulse, there are better windows! Bob Anastasopoulos Achilleas wrote: Hi, I noticed that the Gaussian pulse is convolved with a rectangular window in the GMSK modulator. Why is that so? Thanks Achilleas ___ Di

[Discuss-gnuradio] question on gmsk mod block

2007-05-09 Thread Anastasopoulos Achilleas
Hi, I noticed that the Gaussian pulse is convolved with a rectangular window in the GMSK modulator. Why is that so? Thanks Achilleas ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio