Short-wave four-channel narrow-band diversity reception system

Abstract

The invention provides a short wave four-channel narrow-band diversity reception system which comprises a four-array-element antenna array, matching networks and a diversity reception machine. Each matching network is arranged at the root portion of each antenna, control signals and radio-frequency signals are transmitted between each matching network and the diversity reception machine, the diversity reception machine is a four-channel integrated channel machine, narrow-band diversity reception processing inside the diversity reception machine is mainly implemented at the simulation front end of a receiving channel module and a channel digital signal processing module, a maximal ratio combining technology method is used in the channel digital signal processing module for controlling branches to receive gain respectively to obtain optimal signals of different antennas, meanwhile, the signal-to-noise ratio of a signal of each branch is provided in real time, the signals are combined in a same-phase mode according to an appropriate gain coefficient after phase adjustment, and an optimal signal with the largest signal-to-noise ratio can be obtained. The short wave four-channel narrow-band diversity reception system can effectively improve bit error rate performance of a short-wave narrow-band communication system, reduces sensitivity of the short-wave narrow-band communication system to fading, and improves the effect of short-wave narrow-band communication.

Description

technical field

[0001] The invention relates to the technical field of shortwave communication, in particular to a shortwave four-channel narrowband diversity receiving system. Background technique

[0002] Due to the existence of multipath fading in shortwave communication, the effect of receiving at a single point will be relatively poor after propagation through the ionosphere. To solve this problem, space diversity technology needs to be adopted. Space diversity technology can effectively fight against signal fading. Space diversity is to use multiple receiving antennas to receive signals. Different signal levels will be generated at each antenna, and a strongest signal can always be found, which can improve the quality of reception. Compared with the use of a single antenna, it is significantly improved. Through effective algorithms, the signals are combined and processed, and the receiving performance is greatly improved. In order to ensure the uncorrelation of the r...

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