WIRELESS POWER TRANSFER IN-BAND COMMUNICATION SYSTEM
First Claim
1. A wireless charging in-band communication system comprising:
- a transmitter module that formats a message using CRC calculation and attaches the results of the CRC calculation to the message for message error detection, the transmitter includes channel encoding 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, and a synchronization module that prepends the message with a synchronization sequence having Golay complementary codes; and
a 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 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).
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Abstract
A wireless charging in-band communication system includes a transmitter module that formats a message using CRC calculation and attaches the results of the CRC calculation to the message for message error detection. The transmitter includes channel encoding for message error correction. A modulation module performs biphase modulation for DC balanced signals and impedance switching to change reflected impedance seen by the source. A synchronization module prepending the message with a synchronization sequence having Golay complementary codes. Moreover, the in-band communication includes a 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 includes a Golay complementary code correlator used for message detection, synchronization, and equalization coefficient estimation and selection. A decoding module 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 Also, the decoding module performs equalization, error correction channel decoding,and error detection (CRC).
31 Citations
28 Claims
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1. A wireless charging in-band communication system comprising:
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a transmitter module that formats a message using CRC calculation and attaches the results of the CRC calculation to the message for message error detection, the transmitter includes channel encoding 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, and a synchronization module that prepends the message with a synchronization sequence having Golay complementary codes; and a 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 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). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of performing the operations of a wireless charging in-band communication system comprising:
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formatting a message using CRC calculation and attaching the results of the CRC calculation to the message for message error detection; performing biphase modulation for DC balanced signals using a modulation module, including impedance switching to change reflected impedance seen by the source; prepending the message with a synchronization sequence having Golay complementary codes using a synchronization module; receiving the message from the transmitter module using a receiver module; providing an impedance sensing circuit to detect changes in the reflected impedance of the transmitter module; providing a front end filter used for pulse shaping and noise rejection; using a Golay complementary code correlator for message detection, synchronization, and equalization coefficient estimation and selection; performing 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 using a biphase demodulator module; and performing equalization, error correction channel decoding, and error detection (CRC). - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification