On Sun, May 24, 2015 at 4:54 AM, Surya Agam <surya11.01a...@gmail.com> wrote:
> Hi everyone, > > I try to simulate file transfer using BPSK with block diagram > > File Source --> PSK Mod --> PSK Demod --> File Sink > > The block setting is > File Source : > -file type = .jpg (282,8 kB (282.765 bytes)) > -repeat = no > -vec length = 1 > > PSK Mod : > -num of constellation = 2 > -gray code = yes > -diff. encoding = yes > -sample/symbol = 2 > -excess BW = 0.35 > -verbose = off > =log = off > > PSK Demod : > -num of constellation = 2 > -diff. encoding = yes > -sample/symbol = 2 > -excess BW = 0.35 > -frequency BW = 6.28/100.0 > -timing BW = 6.28/100.0 > -phase BW = 6.28/100.0 > -gray code = yes > -verbose = off > -log = off > > File Sink > -vec length = 1 > -unbuffered = on > -append file = overwrite > > The size of input file = 282,8 kB (282.765 bytes) > but the size of output file = 2,3 MB (2.262.066 bytes) > > What's wrong with my fg? > > Thank you, > Surya Agam > The output is unpacked. So each sample only represents a single bit. You have to repack them into 8 bits per byte, but you'll also need to know where to start through some kind of frame synchronization. 282765*8 = 2262120 The rest of the difference is due to delays in the filters. You can zero-pad the input to "push" the samples through. Tom
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