Simple device for estimating signal-to-noise ratio of communication signal

The invention discloses a simple device for estimating the signal-to-noise ratio of a communication signal and relates to a signal-to-noise ratio estimation device of the parts of speed self-adaption, channel estimation, power control and the like in the field of communication. The device consists of an orthogonal down converter, a low pass filter, a power estimator, a signal-to-noise ratio estimator and the like; and two independent band pass filters with different band widths are used for filtering a receipt signal respectively, total power of the filtered signal is counted, and the signal-to-noise ratio of the receipt signal is obtained through certain statistical calculation. The device has the characteristics of high accuracy of signal-to-noise ratio estimation, wide range of the signal-to-noise ratio which can be accurately estimated, and simplicity in implementation, and is particularly suitable for a channel estimation-based speed self-adaption or power self-adaption communication system.