Power line communication system impulse noise suppression method based on recursive compressed sensing

• Main Authors: LI YOUMING, LIANG HUI, WANG YONG, LYU XINRONG
• Format: Patent
• Language: Chinese; English
• Published: 28.04.2020
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

The invention discloses a power line communication system impulse noise suppression method based on recursive compressed sensing. The method comprises: selecting a part of subcarriers from numerous subcarriers to serve as pilot frequency subcarriers to be used for block weakness channel estimation; combining the channel impulse response and the asynchronous impulse noise in the received signal onthe pilot frequency subcarrier and giving a combined probability density function; solving the hyper-parameter by using an expectation maximization method through two-step alternate iteration of E-step and M-step, and performing iterative estimation on the hyper-parameter in the E-step by using a Kalman filter and a smoother, so that estimated values of channel impulse response and asynchronous impulse noise can be further obtained; and finally, subtracting the estimated value of the asynchronous impulse noise from the received frequency domain signal; obtaining a frequency domain signal obtained after asynchronous pu