Design of multi-channel communication system based on out-of-band real-time calibration
To meet the application requirements of multi-antenna beamforming in 5G mobile communications,this paper designs and implements a multi-channel Software Defined Radio (SDR) communication system,and based on this system,achieves broadband multi-channel multi-frequency point synchronization calibration.To address the issue of multi-channel synchronization drift due to environmental factors such as temperature,this paper innovatively proposes a real-time synchronization scheme based on out-of-band calibration signals.This scheme inserts calibration signals into the redundant bandwidth of OFDM communications to track the drift of multi-channel response errors over time and compensates for the in-band effective signals.At the 1 GHz frequency point,the system effectively compensates for the phase response error drift of 2.8 ℃ and amplitude response error drift of 0.2 dB caused by temperature variations through real-time calibration.After initialization calibration and real-time calibration,the phase error is controlled within 0.4 ℃,and the amplitude response error is controlled within 0.05 dB in the temperature range of 40 to 80 ℃.This scheme not only achieves higher precision but is also completely transparent to the end user,allowing calibration without interrupting communication operations,making it highly significant for the design of 5G multi-channel synchronization.
communication terminalmulti-channel synchronizationAD9361FPGAout-of-band real-time calibration
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