Something like this:
const unsigned char *in = (const unsigned char *) input_items[0];
gr_complex *out = (gr_complex *) output_items[0];
gr_complex zero, one;
zero = gr_complex(1.0, 0.0);
one = gr_complex(-1.0, 0.0);
for (int i = 0; i < noutput_items; i++) {
if (in[i] == 0) {
out[i] = zero;
}
else
{
out[i] = one;
}
}
Ron
On 2/15/19 14:53, Laura Arjona wrote:
Hello,
I want to transmit a bit-stream with an usrp_sink, using BPSK modulation.I have an OOT block in C++ (let's name it tx_bpsk_impl.cc) , where I want to define the symbol vector for bit_0 and bit_1, and pass those symbolsto the uhd_sink.
I have the system already implemented for transmitting ASK-FM0 symbols (also 1 bit per symbol), andI am confused about adapting my system to use BPSK modulation.
Overall, I would like to do the following (this is a simplified implementation:
if( bit_stream[i] == 1)memcpy(&out[written], &data_bpsk1[0], sizeof(float) * data_bpsk1.size() );written +=data_bpsk1.size()
elsememcpy(&out[written], &data_bpsk0[0], sizeof(float) * data_bpsk0.size() );written +=data_bpsk0.size()end
I am not sure about how to generate the vectors data_bpsk1 and data_bpsk0
I have been reading many documentation already, so any advice/guidance aboutthe generation of the bit0 and bit1 symbols would be appreciated.
Thanks!
--
Laura ArjonaWashington Research Foundation Innovation Postdoctoral Fellow in Neuroengineering
Paul G. Allen School of Computer Science & Engineering
185 E Stevens Way NEUniversity of WashingtonSeattle, WA 98195-2350
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