Adjacent channel power ratio
Adjacent Channel Power Ratio is ratio between the total power of adjacent channel to the main channel's power.Ratio
The ratio between the total power adjacent channel to the main channel's power. There are two ways of measuring ACPR. The first way is by finding 10*log of the ratio of the total output power to the power in adjacent channel. The second is to find the ratio of the output power in a smaller bandwidth around the center of carrier to the power in the adjacent channel. The smaller bandwidth is equal to the bandwidth of the adjacent channel signal. Second way is more popular, because it can be measured easily.
ACPR is desired to be as low as possible. A high ACPR indicates that significant spectral spreading has occurred.
