Layer Mapper in GnuRadio

[omar111]

Hello

I'm supposed to create a block in GnuRadio that has 1 input and 2 or 4 outputs , it's actually a Layer mapper in MIMO processing of LTE.

I have written the constructor :

Layer_Mapper_Transmit_Diversity_cc_impl::Layer_Mapper_Transmit_Diversity_cc_impl(int numLay,int constNum)
: gr_block("Layer_Mapper_Transmit_Diversity_cc",
gr_make_io_signature(1, 1, sizeof (float)*16/(constNum)),
gr_make_io_signature(2, 4, sizeof (float)*16/(constNum*numLay)))
{
NumLay=numLay; //Number of Layers
M=constNum; //Constellation Cardinality
}


and the Forecast Function:

void
Layer_Mapper_Transmit_Diversity_cc_impl::forecast (int noutput_items, gr_vector_int &ninput_items_required)
{
ninput_items_required[0] = NumLay * noutput_items;
}


In The General Work Function I wanted to create 4 outputs this way:

int
Layer_Mapper_Transmit_Diversity_cc_impl::general_work (int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const float **in = (const float **) input_items[0];
float **out0 = (float **) output_items[0];
float **out1 = (float **) output_items[1];
float **out2 = (float **) output_items[2];
float **out3 = (float **) output_items[3];

Because the inputs and outputs are arrays so I declared them as matrices , does GnuRadio accept this ?