Multi-channel signal synchronization and diversity combining device and method

Abstract

The invention discloses a multi-channel signal synchronization and diversity combining device and method. The method comprises the following steps: receiving multi-channel diversity signals, and calculating the signal-to-noise ratio (SNR) of the signals of each channel according to the multi-channel diversity signals; selecting the signals of any channel as reference signals, and carrying out orthogonal down-conversion and low-pass filtering on the signals of each channel; carrying out inner ring phase discrimination and loop filtering on the reference signals and the signals of the other channels; respectively carrying out maximal-ratio combining on all same-phase branches and orthogonal branches that are obtained through the low-pass filtering; carrying out outer ring phase discrimination and loop filtering on maximal-ratio combining results; completing pre-combining same-frequency and same-phase adjustments of the multi-channel signals jointly through a plurality of differential mode rings and an overall common mode ring; and completing calculation of weights of the signals of each channel during the combining through SNR estimations, so that the maximal-ratio combining is completed. The method has the advantages that the implementation is easy; and a larger combining gain can be provided, so that the information transmission quality is improved.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a multi-channel signal synchronization and diversity combination device and method. Background technique [0002] In recent years, in the communication field, many technologies have been developed and applied, and communication quality issues have also received more and more attention. When the signal is transmitted in the actual wireless communication system, the existence of multipath transmission will cause the signal to fade, and the fading will affect the quality of communication. Multipath effect is an important factor affecting the quality of wireless communication. Multipath effect usually affects Signal transmission, however, diversity technology can effectively weaken the adverse effects of multipath effects on wireless channels. The diversity gain can be obtained by using the diversity technology, and the communication quality can be improved by obtaining the div...

AI Technical Summary

Problems solved by technology

The most prominent problem of this method is that it ignores the carrier frequency drift and the Doppler frequency offset in the transmission process, and cannot completely adjust the same frequency and phase; in addition, this method is also limited by the modulation type, and can only complete two channels The phase adjustment of the signal does not meet the requirements of multi-channel signal synchronization and diversity combination

[0005] In the double-loop phase-locking method, the differential mode loop is used to complete the locking of the two signals at the same frequency and phase, and the common-mode loop is used to suppress the carrier frequency drift and Doppler frequency deviation. The differential mode is better than the phase method, and can simultaneously Complete the adjustment of frequency and phase, but it is also only suitable for the situation of diversity combining of two-channel signals

[0006] When it comes to the synchronization of multi-channel signals, it is difficult for ordinary phase-locked loops to complete the processing of multi-channel signals at the same frequency and phase at the same time, which will cause the adverse consequences of a sharp drop in the signal-to-noise ratio after the combination and affect the communication quality.

Images