An unmodulated carrier of amplitude A c and frequency c and band-limited white noise are summed

An unmodulated carrier of amplitude A_c and frequency ƒ_c and band-limited white noise are summed and then passed through an ideal envelope detector. Assume the noise spectral density to be of height N₀/2 and bandwidth 2W, centered about the carrier frequency ƒ_c. Determine the output signal-to-noise ratio for the case when the carrier-to-noise ratio is high.