Complex Matrix Multiplication
[Matrix Functions]

Floating-point Complex matrix multiplication.

Floating-point, complex, matrix multiplication.

Parameters:

[in]	*pSrcA	points to the first input complex matrix structure
[in]	*pSrcB	points to the second input complex matrix structure
[out]	*pDst	points to output complex matrix structure

Returns:

The function returns either ARM_MATH_SIZE_MISMATCH or ARM_MATH_SUCCESS based on the outcome of size checking.

Definition at line 73 of file arm_mat_cmplx_mult_f32.c.

Q15 Complex matrix multiplication.

Q15, complex, matrix multiplication.

Parameters:

[in]	*pSrcA	points to the first input complex matrix structure
[in]	*pSrcB	points to the second input complex matrix structure
[out]	*pDst	points to output complex matrix structure
[in]	*pScratch	points to the array for storing intermediate results

Returns:

The function returns either ARM_MATH_SIZE_MISMATCH or ARM_MATH_SUCCESS based on the outcome of size checking.

Conditions for optimum performance

Input, output and state buffers should be aligned by 32-bit

Restrictions

If the silicon does not support unaligned memory access enable the macro UNALIGNED_SUPPORT_DISABLE In this case input, output, scratch buffers should be aligned by 32-bit

Scaling and Overflow Behavior:

The function is implemented using a 64-bit internal accumulator. The inputs to the multiplications are in 1.15 format and multiplications yield a 2.30 result. The 2.30 intermediate results are accumulated in a 64-bit accumulator in 34.30 format. This approach provides 33 guard bits and there is no risk of overflow. The 34.30 result is then truncated to 34.15 format by discarding the low 15 bits and then saturated to 1.15 format.

Refer to arm_mat_mult_fast_q15() for a faster but less precise version of this function.

Definition at line 88 of file arm_mat_cmplx_mult_q15.c.

Q31 Complex matrix multiplication.

Q31, complex, matrix multiplication.

Parameters:

[in]	*pSrcA	points to the first input complex matrix structure
[in]	*pSrcB	points to the second input complex matrix structure
[out]	*pDst	points to output complex matrix structure

Returns:

The function returns either ARM_MATH_SIZE_MISMATCH or ARM_MATH_SUCCESS based on the outcome of size checking.

Scaling and Overflow Behavior:

The function is implemented using an internal 64-bit accumulator. The accumulator has a 2.62 format and maintains full precision of the intermediate multiplication results but provides only a single guard bit. There is no saturation on intermediate additions. Thus, if the accumulator overflows it wraps around and distorts the result. The input signals should be scaled down to avoid intermediate overflows. The input is thus scaled down by log2(numColsA) bits to avoid overflows, as a total of numColsA additions are performed internally. The 2.62 accumulator is right shifted by 31 bits and saturated to 1.31 format to yield the final result.

Definition at line 75 of file arm_mat_cmplx_mult_q31.c.