4.2.12 vsip_dvmodulate_p - Vector Modulation with Complex Carrier

vsip_scalar_f vsip_vmodulate_f(const vsip_vview_f *a, vsip_scalar_f nu, 
                              vsip_scalar_f phi, const vsip_cvview_f *r); 
vsip_cscalar_f vsip_vmodulate_f(const vsip_cvview_f *a, vsip_scalar_f nu, 
                               vsip_scalar_f phi, const vsip_cvview_f *r);

Description

This function modulates a real-valued baseband signal with a complex exponential carrier. The modulation is performed as:

for all from 0 to , where is the length of the vectors, is the input signal, and is the complex modulated output.

Parameters

• const vsip_dvview_p* a: Input real vector containing the baseband signal to be modulated.

• vsip_scalar_f nu: Normalized frequency of the carrier in cycles per sample, .

• vsip_scalar_f phi: Initial phase of the carrier in radians, .

• const vsip_cvview_p* r: Output complex vector that will store the modulated signal.

Return Value

• Returns the final phase of the carrier (in radians) after modulation, which can be used for continuous phase modulation across multiple calls.

Notes

• The input and output vectors must have the same length.