A waveform generator includes a carrier band generator to produce a carrier signal, one or more selectable frequency multipliers to receive the carrier signal and to output a selected carrier signal having a frequency of a multiple of the carrier signal, at least two main digital-to-analog converters (DACs), each main DAC to receive a digital in-phase (I) or quadrature (Q) signals, and to convert the digital I and Q signals to analog I and Q signals in accordance with a control signal, at least two offset DACs, each offset DAC to receive the digital I or Q signals to convert the digital I and Q signals to analog I and Q signals in accordance with the control signal, a mixer to mix the analog I and Q signals with the selected carrier signal to produce an output signal, and a variable filter configured to produce a filtered output signal.

Within many applications impulse radio based ultra-wideband (IR-UWB) transmission offers significant benefits for very short range high data rate communications when compared with existing standards and protocols. In many of these applications the main design goals are very low power consumption and very low complexity design for easy integration and cost reduction. Digitally programmable IR-UWB transmitters using an on-off keying modulation scheme on a 0.13 microns CMOS process operating on 1.2V supply and yielding power consumption as low as 0.9 mW at a 10 Mbps data rate with dynamic power control are enabled. The IR-UWB transmitters support new frequency hopping techniques providing more efficient spectrum usage and dynamic allocation of the spectrum when transmitting in highly congested frequency bands. Biphasic scrambling is also introduced for spectral line reduction. Additionally, an energy detection receiver for IR-UWB is presented to similarly meet these design goals whilst being adaptable to address IR-UWB transmitter specificity.

Within many applications impulse radio based ultra-wideband (IR-UWB) transmission offers significant benefits for very short range high data rate communications when compared with existing standards and protocols. In many of these applications the main design goals are very low power consumption and very low complexity design for easy integration and cost reduction. Digitally programmable IR-UWB transmitters using an on-off keying modulation scheme on a 0.13 microns CMOS process operating on 1.2V supply and yielding power consumption as low as 0.9 mW at a 10 Mbps data rate with dynamic power control are enabled. The IR-UWB transmitters support new frequency hopping techniques providing more efficient spectrum usage and dynamic allocation of the spectrum when transmitting in highly congested frequency bands. Biphasic scrambling is also introduced for spectral line reduction. Additionally, an energy detection receiver for IR-UWB is presented to similarly meet these design goals while being adaptable to address IR-UWB transmitter specificity.

The present embodiments include methods of time-frequency analyzing signals. Some embodiments provide methods of processing signals comprising: adaptively partitioning at least a portion of a signal in a time domain into a plurality of segments of the signal; and transforming each of the segments of the signal producing respective expansions in a frequency domain and obtaining respective samples of the windows of signal in the frequency domain.

Systems, devices and methods are disclosed using a transmitter architecture to keep the transmitter in a deep sleep mode before activation/enabling. The transmitter tag comprises a power-good-detector, a first regulator and a second regulator. The power-good-detector includes a power-good-latch, a ring oscillator and a ripple counter. Upon disconnecting a GPIO pin from the ground, the power-good-latch sends a Bias_EN signal to the regulator. Upon receipt of the Bias_EN signal, the first regulator transmits a wakeup signal to the ring oscillator, which then starts sending the clock signals to the ripple counter. When the counted clock signals reach a threshold value, the ripple counter sends the power-good-digital signal to the flip flops. When the tag is in the reset mode, the power-good-digital signal is also low. When the power-good-digital signal goes from low to high, the tag is out of the reset mode.

Time-offset, time-overlapping signals are received. The signals each include a pilot code, and at least some of the signals each include a user code occupying a time slot time-synchronized to a respective pilot code. Time-offset cross-correlation peaks for respective ones of the pilot codes are generated, each cross-correlation peak indicating a respective one of the time slots. For each time slot a respective projection vector including user code projections each indicative of whether a respective user code of known user codes is present in the time slot is generated. Particular ones of the projection vectors are selectively combined into an aggregate projection vector of aggregate user code projections, such that the aggregate projection vector has a signal-to-noise ratio (SNR) greater than the projection vectors individually. The user code is selected from among the known user codes based on the aggregate user code projections of the aggregate projection vector.

An impulse wireless communication system includes an oscillation signal generator that generates a plurality of oscillation signals having a delay interval with each other and having the same phase and amplitude or different phases and amplitudes, an envelope signal generator that extracts a sync signal and a data signal making up communication signal data and generates an envelope signal for the sync signal and an envelope signal for the data signal, a signal synthesizer that synthesizes the plurality of oscillation signals with the envelope signals, an envelope signal extractor that extracts a plurality of modulation envelope signals from the impulse signal, an amplitude phase determiner that determines the phase and the amplitude in the plurality of modulation envelope signals based on the plurality of oscillation signals, and a calculator that extracts the envelope signals from the plurality of modulation envelope signals based on the phase and the amplitude.

Systems and methods for ultra-wideband (UWB) in-band discovery may include a first UWB device which determines an availability for associations with potential controlees, and which generates and transmits an application control (AC) information element (IE) indicating the availability. A second UWB device may receive the AC IE, select an available slot for transmitting an association request to the first UWB device, and transmit the association request in the available slot. The first UWB device may receive the association request, generate an association response, and transmit the association response to the second UWB device.

Within many applications impulse radio based ultra-wideband (IR-UWB) transmission offers significant benefits for very short range high data rate communications when compared with existing standards and protocols. In many of these applications the main design goals are very low power consumption and very low complexity design for easy integration and cost reduction. Digitally programmable IR-UWB transmitters using an on-off keying modulation scheme on a 0.13 microns CMOS process operating on 1.2V supply and yielding power consumption as low as 0.9 mW at a 10 Mbps data rate with dynamic power control are enabled. The IR-UWB transmitters support new frequency hopping techniques providing more efficient spectrum usage and dynamic allocation of the spectrum when transmitting in highly congested frequency bands. Biphasic scrambling is also introduced for spectral line reduction. Additionally, an energy detection receiver for IR-UWB is presented to similarly meet these design goals whilst being adaptable to address IR-UWB transmitter specificity.

Embodiments enable communicating Ultra Wideband (UWB) devices to collaborate by exchanging pulse shape information. The UWB devices use the pulse shape information to improve ranging accuracy. The improved ranging accuracy can be used in complex multipath environments where advanced estimation schemes are used to extract an arriving path for time-of-flight estimation. To determine the pulse shape information to be shared, some embodiments include determining location information of a UWB device and selecting the pulse shape information that satisfies regional aspects. The pulse shape information includes a time-zero index specific to a ranging signal that is used by UWB receivers to establish timestamps time-of-flight calculations. Some embodiments include measuring performance characteristics and selecting different pulse shape information based on the performance characteristics for improved accuracy.