An example apparatus includes: a receiver operable to receive a modulated input signal at a receiver input and output a demodulated signal at a receiver output, the receiver comprising a switch having a first current terminal and a first control terminal, the first current terminal coupled to the receiver output. The example apparatus includes a capacitor having a first terminal and a second terminal, the second terminal coupled to the first control terminal and the first terminal coupled to the receiver input. The example apparatus includes a resistor having a third terminal and a fourth terminal, the fourth terminal coupled to the first control terminal. The example apparatus includes a voltage offset source having an input and an output, the output coupled to the third terminal. The example apparatus includes a current source coupled to the first current terminal.

Waveform-coding is applied to map successive on-off-keying (OOK) data bits onto successive multicarrier modulated symbols in time domain, wherein each multicarrier modulated symbol includes a set of sub-carriers in which alternating sub-carriers are set to non-zeros and zeros in frequency domain. The waveform coded multicarrier modulated symbols are up-converted to a carrier frequency to provide a data signal that is transmitted over a wireless channel.

Waveform-coding is applied to map successive on-off-keying (OOK) data bits onto successive multicarrier modulated symbols in time domain, wherein each multicarrier modulated symbol includes a set of sub-carriers in which alternating sub-carriers are set to non-zeros and zeros in frequency domain. The waveform coded multicarrier modulated symbols are up-converted to a carrier frequency to provide a data signal that is transmitted over a wireless channel.

Provided is a near-field communication (NFC) receiver. The NFC receiver includes at least one antenna configured to receive an amplitude modulation (AM) signal, a first analog-to-digital converter (ADC) configured to generate an in-phase (I)-sample by sampling the AM signal based on a first clock signal, a second ADC configured to generate a quadrature-phase (Q)-sample by sampling the AM signal based on a second clock signal, the second clock signal having a phase difference of 90° from the first clock signal, and processing circuitry configured to calculate a root-sum-square (RSS) value between the I-sample and the Q-sample, and detect an envelope of the AM signal by using the RSS value.

Provided is a near-field communication (NFC) receiver. The NFC receiver includes at least one antenna configured to receive an amplitude modulation (AM) signal, a first analog-to-digital converter (ADC) configured to generate an in-phase (I)-sample by sampling the AM signal based on a first clock signal, a second ADC configured to generate a quadrature-phase (Q)-sample by sampling the AM signal based on a second clock signal, the second clock signal having a phase difference of 90° from the first clock signal, and processing circuitry configured to calculate a root-sum-square (RSS) value between the I-sample and the Q-sample, and detect an envelope of the AM signal by using the RSS value.

With rapid increases in the number and spatial density of wireless messages as 5G and 6G are rolled out, it is essential that improved methods for fault-tolerant demodulation and error mitigation be developed. Disclosed herein are methods for receiving a message concatenated with a demodulation reference, determining the predetermined modulation levels of a modulation scheme, and demodulating the message by measuring the amplitude mad/or phase modulation values of each message element. The measured modulation values are then compared with the predetermined modulation levels of the modulation scheme to demodulate the message. Importantly, the message can be demodulated by determining an amplitude and phase of the raw signal for each message element, or by separating the raw signal into two orthogonal “branches” and determining the amplitudes of the two branches. By demodulating the message both ways, message faults may be identified and mitigated, according to some embodiments.

With rapid increases in the number and spatial density of wireless messages as 5G and 6G are rolled out, it is essential that improved methods for fault-tolerant demodulation and error mitigation be developed. Disclosed herein are methods for receiving a message concatenated with a demodulation reference, determining the predetermined modulation levels of a modulation scheme, and demodulating the message by measuring the amplitude mad/or phase modulation values of each message element. The measured modulation values are then compared with the predetermined modulation levels of the modulation scheme to demodulate the message. Importantly, the message can be demodulated by determining an amplitude and phase of the raw signal for each message element, or by separating the raw signal into two orthogonal “branches” and determining the amplitudes of the two branches. By demodulating the message both ways, message faults may be identified and mitigated, according to some embodiments.

Systems and apparatuses for wireless power transfer system are described. A receiver may send an amplitude shift key (ASK) signal to a transmitter. The transmitter may receive the ASK signal from the receiver. The transmitter may perform a demodulation on the ASK signal. The transmitter may, in response to a failure to demodulate the ASK signal, encode a notification of failure in a frequency shift key (FSK) signal. The transmitter may transmit the FSK signal to the receiver. The receiver may receive the FSK signal. The receiver may perform a function to resolve the failure to demodulate the ASK signal.

Systems and apparatuses for wireless power transfer system are described. A receiver may send an amplitude shift key (ASK) signal to a transmitter. The transmitter may receive the ASK signal from the receiver. The transmitter may perform a demodulation on the ASK signal. The transmitter may, in response to a failure to demodulate the ASK signal, encode a notification of failure in a frequency shift key (FSK) signal. The transmitter may transmit the FSK signal to the receiver. The receiver may receive the FSK signal. The receiver may perform a function to resolve the failure to demodulate the ASK signal.

Methods, systems, and devices for improving uniformity between levels of a multi-level signal are described. Techniques are provided herein to unify vertical alignment between data transmitted using multi-level signaling. Such multi-level signaling may be configured to capture transmitted data during a single clock cycle of a memory controller. An example of multi-level signaling scheme may be pulse amplitude modulation (PAM). Each unique symbol of the multi-level signal may be configured to represent a plurality of bits of data.