In general, radios that use complex-baseband format interleave I/Q in
the way you're apparently using here. That's very conventional.
It's very usual for the interface to "present" complex-float to Gnu
Radio as the default format, since the vast majority of DSP blocks
operate on complex-float or float. Not a show-stopper, since blocks
exist to convert from signed-short formats into complex-float, but it's
a nice convenience for users.
On 2015-04-23 15:09, Yile Ku wrote:
> I am writing a source module/block and I generate 16 bit signed I and Q
> values. There is first a 16 bit I value then a 16 bit Q value repeated 1024
> times.
>
> In my source module I have:
>
> usbradio_impl::usbradio_impl()
> : gr::sync_block("usbradio",
> gr::io_signature::make(1, 1, sizeof(short)),
> gr::io_signature::make(1, 1, sizeof(short)))
> {
> state = 0;
> cnt = 0;
> set_max_noutput_items(1);
> set_max_output_buffer(2);
> }
>
> /*
> * Our virtual destructor.
> */
> usbradio_impl::~usbradio_impl()
> {
> }
>
> int
> usbradio_impl::work(int noutput_items,
> gr_vector_const_void_star &input_items,
> gr_vector_void_star &output_items)
> {
> short *out = (short *) output_items[0];
>
> // Do <+signal processing+>
> stuff_output(out);
>
> // Tell runtime system how many output items we produced.
> return 1024;
> }
>
> The stuff_output(out) function will stuff an I value then a Q value 512
> times.
>
> Is that the correct way to present I & Q values?
>
> Thx, Y-
>
> _______________________________________________
> Discuss-gnuradio mailing list
> Discuss-gnuradio@gnu.org
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio [1]
Links:
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