A Triply Selective MIMO Channel Simulator Using GPUs

Listing 4

Convolution code.

VEX_FUNCTION_D(cl_double2, convolution2,

(size_t, i) (cl_double2, x)

(cl_double2, y)(int, tRc)(int, nD)

(int, uS)(int, nT)(int, nR),(cmul)

(csum),

double2 sum = 0.0,0.0;

int tmp1 = inD;

int tmp2 = i/nD;

int  ext = uS   tRc;

int  limt = tRc;

if(tmp1 < tRc)

limt = tmp1 + 1;

for(size_t k=0; k<nT; k++)

for(size_t j=0; j<limt; j++)

sum = csum(sum, cmul(

x[tmp1-j+knD],

y[tmp1+juS+ext(knR+tmp2)]

));

return sum;

);