Short-wave multi-antenna signal enhancement receiving method

Abstract

The invention discloses a short-wave multi-antenna signal enhancement receiving method. The method comprises the following steps: firstly, adding cyclical redundancy check (CRC) bits for sent information bits at a sending end, forming a data block through modulation after channel coding and interleaving processing, and adding a synchronous sequence for a receiving end to extract timing synchronous information before the data block is sent; adopting multi-antenna receiving when the receiving end receives signals, utilizing received signals to extract the synchronous information, simultaneously carrying out channel estimation, and estimating corresponding channel parameters for demodulation processing; after carrying out one-by-one antenna demodulation or one-by-one path demodulation on multi-path signals received from different antennas, and carrying out diversity combination; using parallel data after diversity combination to solve a soft bit value, after deinterlacing and decoding decision, obtaining all paths of data by sequential checking and decoding of CRC, and when checking that certain path of data is correct, stopping checking, and simultaneously outputting the path of data. By utilizing the short-wave multi-antenna signal enhancement receiving method, the receiving performance of a short-wave fixed station is improved, and the anti-fading performance of the existing short-wave communication system is enhanced.

Description

technical field [0001] The invention belongs to the technical field of short-wave communication, in particular to a method for enhancing reception of short-wave multi-antenna signals. Background technique [0002] Short-wave communication mainly relies on the reflection of the ionosphere and is suitable for long-distance transmission. It has strong invulnerability and simple equipment. It plays an irreplaceable role in the field of military communication. Due to the particularity of the ionospheric structure, the ionospheric reflection channel is a time-varying dispersion channel with characteristics such as time-varying and multipath fading, which seriously affects the quality of the received signal. In the existing shortwave communication network, fixed stations have multiple receivers corresponding to different antennas, and each antenna receives signals from shortwave mobile users in different directions. figure 1 It shows that at a certain moment, the fixed station use...

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Problems solved by technology

[0003] On the one hand, the transmission power of short-wave mobile users is limited. For example, the backpack short-wave radio station is usually 20W, and short-wave mobile user terminals mostly use whip antennas, and the antenna transmission gain is low. Therefore, the low-power signals transmitted by short-wave mobile users fade after experiencing short-wave channel propagation. It is more serious, causing the signal received by the fixed station to be weak, which affects the receiving performance of the shortwave fixed station

[0004] On the other hand, the current HF fixed station is based on a single-antenna reception method, mainly relying on the equalization technology, interleaving and channel coding and decoding technologies in the existing communication system to resist the influence of channel fading, and its reception performance needs to be further improved

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