Research On Impulse Noise Suppression In Broadband Power Line Communication

Broadband power line communication is a technology that uses power lines to communicate,which is promising in applications since it does not need to re-lay lines,save equipment costs,and facilitate access,etc.It has good development prospects and advantages.However,in the initial stage,the power line was not used for communication,so there are many restrictions on the transmission of signals in the power line channel,among which the most prominent one is the interference of impulse noise to the signal.The suppression and elimination of impulse noise in power lines is an important basis to realize effective communication of power lines.This thesis mainly studies the suppression technology of impulse noise in broadband power line channels.The main tasks are as follows:(1)A Myriad filtering algorithm based on DFT-S-OFDM technology is proposed to overcome the problem of high PAPR in OFDM technology.The OFDM technology in the original system is replaced by the DFT-S-OFDM technology,and the signal is transmitted in a single carrier DFT-S-OFDM system.Although the two have a similar structure,the latter reduces the average power consumption while maintaining a low PAPR and achieves the effect of effective suppression and elimination impulse noise.(2)Fast reconstruction algorithm based on lorentz norm is proposed,which overcomes the problem that the traditional form of L2 norm constraint is only effective in the reconstruction of gaussian white noise.Lorenz norms will not excessively punish sample points with large deviations in the observed signal,which is robust.Therefore,in this paper,the Lorentz norm is used to replace the L2 norm as the constraint loss term,and the traditional L2-SL0 reconstruction algorithm is improved to a fast reconstruction algorithm based on the LL2-SL0 norm.The simulation results show that the algorithm has a fast convergence speed and good global convergence to recover the original signal,can suppress and eliminate the impulse noise in power line carrier communication.