Complex-by-Complex Multiplication

void riscv_cmplx_mult_cmplx_f32(const float32_t *pSrcA, const float32_t *pSrcB, float32_t *pDst, uint32_t numSamples)
void riscv_cmplx_mult_cmplx_q15(const q15_t *pSrcA, const q15_t *pSrcB, q15_t *pDst, uint32_t numSamples)
void riscv_cmplx_mult_cmplx_q31(const q31_t *pSrcA, const q31_t *pSrcB, q31_t *pDst, uint32_t numSamples)
group CmplxByCmplxMult

Multiplies a complex vector by another complex vector and generates a complex result. The data in the complex arrays is stored in an interleaved fashion (real, imag, real, imag, …). The parameter numSamples represents the number of complex samples processed. The complex arrays have a total of 2*numSamples real values.

The underlying algorithm is used:

There are separate functions for floating-point, Q15, and Q31 data types.

Functions

void riscv_cmplx_mult_cmplx_f32(const float32_t *pSrcA, const float32_t *pSrcB, float32_t *pDst, uint32_t numSamples)

Floating-point complex-by-complex multiplication.

Return

none

Parameters
  • [in] pSrcA: points to first input vector

  • [in] pSrcB: points to second input vector

  • [out] pDst: points to output vector

  • [in] numSamples: number of samples in each vector

void riscv_cmplx_mult_cmplx_q15(const q15_t *pSrcA, const q15_t *pSrcB, q15_t *pDst, uint32_t numSamples)

Q15 complex-by-complex multiplication.

Return

none

Scaling and Overflow Behavior

The function implements 1.15 by 1.15 multiplications and finally output is converted into 3.13 format.

Parameters
  • [in] pSrcA: points to first input vector

  • [in] pSrcB: points to second input vector

  • [out] pDst: points to output vector

  • [in] numSamples: number of samples in each vector

void riscv_cmplx_mult_cmplx_q31(const q31_t *pSrcA, const q31_t *pSrcB, q31_t *pDst, uint32_t numSamples)

Q31 complex-by-complex multiplication.

Return

none

Scaling and Overflow Behavior

The function implements 1.31 by 1.31 multiplications and finally output is converted into 3.29 format. Input down scaling is not required.

Parameters
  • [in] pSrcA: points to first input vector

  • [in] pSrcB: points to second input vector

  • [out] pDst: points to output vector

  • [in] numSamples: number of samples in each vector