In general you're right, but it depends on the details. Its usually quite straightforward, but a common mistake is to use the wrong bit-to-symbol mapping. 0 -> +1 and 1 -> -1 means that an XOR applied to bits is equivalent to multiplication applied to symbols.
Nowlan, Sean wrote: > > Hi all, > > I'm wondering if spreading a bitstream (XOR-ing each bit with > SPREAD_FACTOR bits of sequence) before QPSK modulation is equivalent to > operating on the modulated stream, i.e., multiplying the complex output > with -1's and 1's from the sequence. So far I can't get the math to work > out. Any suggestions? > > Thanks, > Sean > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://old.nabble.com/QPSK-with-direct-sequence-spread-spectrum-tp32752034p32754111.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
