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

A diversity reception, four-channel technology, applied in the field of short-wave four-channel narrowband diversity reception system, can solve the problems of poor effect, achieve the effect of improving effect, reducing sensitivity, and improving bit error performance

Active Publication Date: 2015-04-22
PANDA ELECTRONICS GROUP +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] Due to the multipath fading of short-wave communication, the effect of receiving at a single point will be relatively poor after propagating through the ionosphere

Method used

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

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Embodiment Construction

[0014] In order to better understand the technical content of the present invention, specific embodiments are given together with the attached drawings for description as follows.

[0015] Such as Figure 1-5 As shown, according to a preferred embodiment of the present invention, the shortwave four-channel narrowband diversity receiving system includes a four-element antenna array, a matching network and a diversity receiver.

[0016] refer to figure 1 , The four-element antenna array uses two whip antennas and two inverted V antennas, which can take into account the receiving effect of near, medium and far.

[0017] The matching network is set at the root of each antenna of the four-element antenna array. The matching network can improve the signal-to-noise ratio, reduce the intermodulation caused by the cyclic reflection of the received signal, and reduce the bit error rate. refer to figure 2 As shown, the matching network includes the control unit and the antenna adapte...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/16H04B7/08H04B1/18
Inventor 俞春华陈文华
Owner PANDA ELECTRONICS GROUP
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