A dual-pilot carrier recovery device for aviation wireless communication

Abstract

The present invention is an aeronautical wireless communication dual-pilot carrier recovery device, which includes a multi-stage convolution cascade filter module, a coarse carrier recovery module, and a fine carrier recovery module. The multi-stage convolution cascade filter module is provided according to the coarse carrier recovery module. The coarse carrier recovery information of the multi-stage convolution cascade filtering is performed to obtain the upper sideband pilot information, the lower sideband pilot information and the modulated data information containing the pilot information respectively; the coarse carrier recovery module performs multi-stage convolution cascade The upper sideband pilot information and the lower sideband pilot information provided by the filtering module are discriminated and analyzed, and the coarse carrier offset compensation of the quasi-complex baseband signal is controlled and output to the multi-stage convolution cascaded filter module; the fine carrier The recovery module performs phase detection and analysis on the upper sideband pilot information and the lower sideband pilot information provided by the multi-level convolution cascaded filter module, and modulates the modulation signal provided by the multi-level convolution cascade filter module according to the phase detection and analysis results Data information completes fine carrier offset compensation.

Description

technical field [0001] The present invention relates to the field of aeronautical wireless communication, in particular to the carrier recovery design of the aeronautical wireless digital broadband transmission system, which is proposed for the aeronautical wireless channel environment, based on the rough and fine two-level structure and using double pilots to realize the carrier recovery method. technical background [0002] The oscillator of the transceiver in the wireless communication system has inherent frequency and phase deviation, which will cause the frequency and phase deviation of the carrier of the receiving and receiving signal. In addition, the Doppler effect caused by the relative movement of the transceiver will increase the carrier frequency deviation. For most wireless communication systems, the signal received by the receiver must be processed by carrier recovery, so that the frequency phase of the carrier is consistent with the carrier frequency of the si...

AI Technical Summary

Problems solved by technology

[0003] In aeronautical wireless communication, the high-speed and high-maneuvering motion of the aircraft will bring about a strong and rapidly time-varying Doppler effect. The traditional technology that only uses frequency-locked phase-locked loops to recover the carrier has a limited capture speed in high-dynamic environments. It is difficult to meet the requirements of dynamic capability and steady-state performance at the same time due to the contradiction between tracking accuracy

[0004] In addition, in principle, carrier recovery can be achieved by using a single pilot signal. However, during the take-off and landing of aircraft and near-earth flight, there may be strong multipath signals, and deep valleys will appear in the signal spectrum.

When the multipath signal is in a certain delay or phase, the single pilot may be greatly attenuated, so that carrier recovery cannot be achieved

Images