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From: | Arturo Rinaldi |
Subject: | [Discuss-gnuradio] MSK constellation : make and decode |
Date: | Mon, 01 Mar 2010 20:14:39 +0100 |
User-agent: | Mozilla/5.0 (X11; U; Linux i686; it-IT; rv:1.9.1.8) Gecko/20100216 Lightning/1.0b1 Thunderbird/3.0.2 |
i'd like to make an MSK constellation (1+j,-1+j,-1-j,1-j) and decode
it. so i put the code this way modulator : file_source(byte) gr_packed_to_unpacked_(1,MSB) gr_chunks_to_symbols((1+j,-1+j,-1-j,1-j),2) file_sink(complex) demodulator: file_source(complex) gr_constellation_decoder_cb((1+j,-1+j,-1-j,1-j),(0,1,0,1)) gr_unpacked_to_packed(1,MSB) file_sink(byte) i found that the size of the demodulated file is twice the original source file (and not correctly demodulated) due obviously to the value of dimension D=2 in gr.chunks_to_symbols. Any hint on how decode the constellation in the correct way or to built it in such 1-D way preserving the orginal size of the file after demodulation ? thx in advance, Arturo |
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