This commit adds a new standalone benchmark, `test_noise`, to measure
and compare the performance of the CPU and CUDA implementations of noise
generation.
The benchmark's methodology is as follows:
- It iterates through various configurations, including different
numbers of receive antennas and signal lengths.
- For each configuration, it runs both the CPU (`add_noise_float`)
and CUDA (`add_noise_cuda`) functions multiple times to get a stable
average execution time.
- It prints a formatted table comparing the CPU and GPU latencies and
calculates the resulting speedup.
Nika Ghaderi
7101dc04d1