|Subject:||Re: [Discuss-gnuradio] BPSK output abnormal|
|Date:||Mon, 25 May 2015 11:09:41 -0400|
Oh thank you Tom, I can recover the file size. About frame synchronization, am I need Polyphase Clock Sync Block? And also I have no idea about "You can zero-pad the input to "push" the samples through."?
On Mon, May 25, 2015 at 12:34 AM, Tom Rondeau <address@hidden> wrote:On Sun, May 24, 2015 at 4:54 AM, Surya Agam <address@hidden> wrote:Hi everyone,I try to simulate file transfer using BPSK with block diagramFile Source --> PSK Mod --> PSK Demod --> File SinkThe block setting isFile Source :-file type = .jpg (282,8 kB (282.765 bytes))-repeat = no-vec length = 1PSK Mod :-num of constellation = 2-gray code = yes-diff. encoding = yes-sample/symbol = 2-excess BW = 0.35-verbose = off=log = offPSK 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 = offFile Sink-vec length = 1-unbuffered = on-append file = overwriteThe 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 AgamThe 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 = 2262120The 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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