WIRELESS POWER TRANSFER IN-BAND COMMUNICATION SYSTEM

摘要

A wireless charging in-band communication system includes a channel encoding for message error correction and detection. A modulation module performs biphase modulation for DC balanced signals and impedance switching to change reflected impedance seen by the source. A synchronization module prepends the message with a synchronization sequence having Golay complementary codes. A receiver module receives the message from the transmitter module. A preamble detection block has a Golay complementary code correlator used for message detection, synchronization, and equalization coefficient estimation and selection. A decoding module that performs biphase demodulation with error correction with a DC offset being estimated as the average value of the signal over the length of the message before channel decoding. The decoding module performs equalization, error correction and detection channel decoding.

主权项

1. A wireless charging in-band communication system comprising:
a transmitter module that formats a message, the transmitter includes channel encoding for message error correction and detection, and a modulation module that performs modulation for DC balanced signals and impedance switching to change reflected impedance seen by a receiver module, and a synchronization module that prepends the message with a synchronization sequence having Golay complementary codes; and the receiver module that receives the message from the transmitter module, the receiver module includes an impedance sensing circuit to detect changes in the reflected impedance of the transmitter module, the receiver module includes a front end filter used for pulse shaping and noise rejection, a preamble detection block having a Golay complementary code correlator used for message detection, synchronization, and equalization coefficient estimation and selection, and a decoding module that performs demodulation with error correction with a DC offset being estimated as the average value of the signal over the length of the message before channel decoding, the decoding module performs equalization, error correction and detection channel decoding.