[Discuss-gnuradio] QPSK with direct-sequence spread spectrum

[Nowlan, Sean]

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