Non-coherent detection system and method for short-wave broad-band channel

Abstract

The invention relates to the technical field of communication and discloses a non-coherent detection system and method for a short-wave broad-band channel. According to the system and the method, after being filtered and amplified, a short-wave signal enters into a non-coherent demodulation device so as to be demodulated, and then is subjected to signal detection; when a signal is detected, the signal accumulated energy is compared with a set SNR (Signal to Noise Ratio) threshold value, if the signal accumulated energy is greater than the threshold value, the channel bandwidth is automatically regulated, and fine detection is carried out; and the detection method is repeatedly carried out until the accumulated energy is not greater than the set SNR threshold value, and then detection is finished. According to the technical scheme adopted by the invention, signals are not subjected to any assumption, a blind detection algorithm is adopted, any prior knowledge of detection signals is not required to be known; the technical scheme is low in complexity, mature in technology and easy to realize; and the system and the method can be used for regulating the sizes of the resolution bandwidth and the detection signals, finally realizing the rapid detection on the short-wave broad-band channel quality and meeting the user experience.

Description

technical field [0001] The present invention relates to the technical field of communication, and more specifically relates to a short-wave broadband channel non-coherent detection system and detection method. Background technique [0002] The short-wave channel is a time-varying dispersion channel. Because the sky wave is reflected by the ionosphere, it will cause signal fading and frequency dispersion, as well as the interference of electromagnetic noise in the surrounding environment, so the short-wave channel is not as stable as the channel of the cellular system. In this environment, real-time detection of short-wave channels is necessary. [0003] At present, shortwave channel detection generally adopts the method of frequency scanning, and the detection signals are transmitted sequentially in frequency steps in the whole or part of the HF band, each detection signal is 3dB, and the detection signals are scanned and received at the receiving end in sequence. This scan...

AI Technical Summary

Problems solved by technology

This scanning detection method is a blind scanning of the short-wave channel, and the scanning period is long, which cannot meet the requirements of fast link establishment; and in the existing short-wave communication, the detection of the channel is carried out under the condition of narrow band, and all It scans by changing the center frequency, resulting in a long channel detection time, which cannot meet user needs

Images