Asynchronous wireless sensing

A method of asynchronous wireless sensing using ultra-wideband impulse radio with FSK-OOK modulation, comprising:

• forming a complete asynchronous wireless sensing architecture that eliminates a need for clock circuitry in a transmitter;
• combining seamlessly asynchronous sensing and asynchronous wireless communications;
• and
• wherein, effective data rate and energy efficiency are improved and bit-error-rate (BER) and electromagnetic noise emissions are reduced from elimination of the clock circuitry.

An asynchronous integrated Ultra-Wideband (UWB) impulse radio transmitter and receiver suitable for low-power miniaturized wireless sensors, comprising:

• at least one processor;
• a memory communicatively coupled to the at least one processor;
• and wherein the at least one processor is configured to:
• instruct a front-end asynchronous signal interface to convert an input analog signal into two asynchronous digital pulse streams;
• compare an input signal against window boundaries wherein the signal interface has two thresholds predefined as the boundaries of a reference window;
• instruct generation of an output pulse when the input signal exceeds either of the boundaries, wherein the generated output pulse indicates whether the input signal is higher or lower than the thresholds;
• shift the reference window up or down by a predefined step to prepare for a next sampling event;
• transmit a plurality of positive and negative pulses from the asynchronous signal interface by utilizing two separate transmitters with FSK (frequency-shift-keying)-OOK (on-off-keying) modulation, wherein each transmitter consists of a ring oscillator with an input stage, a multiplexer chain, and a power amplifier;
• transmit baseband data to an input stage for performing OOK;
• instruct the ring oscillator to generates RF (radio-frequency) carriers, wherein the frequency of the RF carrier is controlled by the multiplexer chain that performs FSK;
• instruct delivery of a RF impulse to a power amplifier that drives a transmitter antenna;
• and
• instruct a receiver to collect timing information of received positive and negative pulse streams and recover an original input signal.

A non-transitory computer readable medium storing computer executable code, comprising code for:

• instructing a front-end asynchronous signal interface to convert an input analog signal into two asynchronous digital pulse streams;
• comparing an input signal against window boundaries wherein the signal interface has two thresholds predefined as the boundaries of a reference window;
• instructing generation of an output pulse when the input signal exceeds either of the boundaries, wherein the generated output pulse indicates whether the input signal is higher or lower than the thresholds;
• shifting the reference window up or down by a predefined step to prepare for a next sampling event;
• transmitting a plurality of positive and negative pulses from the asynchronous signal interface by utilizing two separate transmitters with FSK (frequency-shift-keying)-OOK (on-off-keying) modulation, wherein each transmitter consists of a ring oscillator with an input stage, a multiplexer chain, and a power amplifier;
• transmitting baseband data to an input stage for performing OOK;
• instructing the ring oscillator to generates RF (radio-frequency) carriers, wherein the frequency of the RF carrier is controlled by the multiplexer chain that performs FSK;
• instructing delivery of a RF impulse to a power amplifier that drives a transmitter antenna;
• and
• instructing a receiver to collect timing information of received positive and negative pulse streams and recover an original input signal.