Loading...
Searching...
No Matches
volk_32fc_x2_conjugate_dot_prod_32fc

Overview

This block computes the conjugate dot product (or inner product) between two vectors, the `input` and `taps` vectors. Given a set of `num_points` taps, the result is the sum of products between the input vector and the conjugate of the taps. The result is a single value stored in the `result` address and is returned as a complex float.

Dispatcher Prototype

void volk_32fc_x2_conjugate_dot_prod_32fc(lv_32fc_t* result, const lv_32fc_t* input,
const lv_32fc_t* taps, unsigned int num_points)

Inputs

- input: vector of complex floats.
- taps: complex float taps.
- num_points: number of samples in both `input` and `taps`.

Outputs

- result: pointer to a complex float value to hold the dot product result.

Example

unsigned int N = 1000;
unsigned int alignment = volk_get_alignment();
lv_32fc_t* a = (lv_32fc_t*) volk_malloc(sizeof(lv_32fc_t) * N, alignment);
lv_32fc_t* b = (lv_32fc_t*) volk_malloc(sizeof(lv_32fc_t) * N, alignment);
for (int i = 0; i < N; ++i) {
a[i] = lv_cmake(.50f, .50f);
b[i] = lv_cmake(.50f, .75f);
}
lv_32fc_t e = (float) N * a[0] * lv_conj(b[0]); // When a and b constant
lv_32fc_t res;
volk_32fc_x2_conjugate_dot_prod_32fc(&res, a, b, N);
printf("Expected: %8.2f%+8.2fi\n", lv_real(e), lv_imag(e));
printf("Result: %8.2f%+8.2fi\n", lv_real(res), lv_imag(res));
volk_free(a);
volk_free(b);