Patent ID: 9363041
Filing Date: 2016-06-07
CPC Classification: H02J,H04B,H04L,H04W

Claim Text:
1. A wireless charging in-band communication system, the wireless charging in-band communication system being used for performing communication between a load device and a source device, the wireless charging in-band communication system comprising: a transmitter module that is positioned within the load device and formats a message using CRC calculation and attaches the results of the CRC calculation to the message for message error detection, the transmitter module includes a channel encoding module for message error correction, and a modulation module that performs biphase modulation for DC balanced signals and impedance switching to change reflected impedance seen by the source device, and a synchronization module that prepends the message with a synchronization sequence having Golay complementary codes; and a receiver module that is positioned within the source device and 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 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 channel decoding, and error detection (CRC); wherein the message is transmitted outward by the transmitter module through changing the reflected impedance, and the message transmitted by the transmitter module is a message corresponding to usage related to power transfer, so as to affect power transfer control of the source device; and the synchronization module provides a gap between the preamble and message, for timing adjustments in the receiver module.