Abstract: Aspects described herein include devices and methods for smart ultra wideband transmissions. In one aspect, an apparatus includes pulse generation circuitry configured to output a plurality of transmission (TX) pulse samples at a selected signal sample rate, where each pulse sample of the plurality of TX pulse samples comprises a value associated with a pulse amplitude at a corresponding sample time The apparatus includes a plurality of power amplifier (PA) cells, with each PA cell of the plurality of PA cells comprising a corresponding current source and associated gates, and where the associated gates of a PA cell are selectable to configure an on state and an off state. Logic circuitry of the apparatus is configured to set the on state or the off state for each PA cell.

Abstract: Aspects described herein include devices and methods for smart ultra wideband transmissions. In one aspect, an apparatus includes pulse generation circuitry configured to output a plurality of transmission (TX) pulse samples at a selected signal sample rate, where each pulse sample of the plurality of TX pulse samples comprises a value associated with a pulse amplitude at a corresponding sample time The apparatus includes a plurality of power amplifier (PA) cells, with each PA cell of the plurality of PA cells comprising a corresponding current source and associated gates, and where the associated gates of a PA cell are selectable to configure an on state and an off state. Logic circuitry of the apparatus is configured to set the on state or the off state for each PA cell.

Abstract: Aspects of the present disclosure generally relate to wireless communication. In some aspects, a first wireless communication device (WCD) may transmit, to a second wireless communication device, a first synchronization message using a first radio frequency (RF) technology and a first frequency resource, the first synchronization message associated with synchronization for a second RF technology. The first WCD may transmit, to the second WCD and after switching to a second frequency resource, a second synchronization message using the first RF technology, the second synchronization message associated with synchronization for the second RF technology, and the switching to the second frequency resource based at least in part on one or more of: transmission of the second synchronization message being associated with ranging or sensing, or failure of the first synchronization message or failure of a reply, from the second WCD, to the first synchronization message. Various other aspects are described.

Abstract: An example method of ultra-wideband (UWB) sensing performed by a wireless communication device, the method comprising determining a first channel impulse response (CIR) estimation of a first frequency channel based on a radio access technology (RAT) session, wherein the RAT is different from UWB. The method also comprises determining a second CIR estimation of a second frequency channel based on a UWB session and determining a third CIR estimation of the first frequency channel based on determining a phase difference between the third CIR estimation and the first CIR estimation. The method further comprises determining a total CIR estimation for a combined frequency channel comprising the first frequency channel and the second frequency channel based on stitching the first CIR estimation, the second CIR estimation, and the third CIR estimation.

Abstract: Techniques are provided for determining the location of ultrawideband (UWB) devices in a network. An example method for providing location information associated with a target device in a UWB network includes determining a location of a bridge device, querying the bridge device for location information associated with the target device, receiving location information associated with the target device from the bridge device, and determining a location of the target device based at least in part on the location of the bridge device and the location information associated with the target device.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first wireless communication device may transmit, to a second wireless communication device, a time and/or frequency synchronization message using a first radio frequency (RF) technology, wherein the time and/or frequency synchronization message is used to obtain synchronization information for a second RF technology. The first wireless communication device may transmit, to the second wireless communication device, a first set of ranging measurement signals associated with the second RF technology. The first wireless communication device may receive, from the second wireless communication device, a second set of ranging measurement signals associated with the second RF technology. Numerous other aspects are described.

Abstract: In some implementations, an ultra-wideband (UWB) transmitter may generate a data packet for performing the UWB ranging, wherein: the data packet comprises a plurality of symbols, and the data packet further includes one or more zero-power symbols at one or more respective pseudo-random locations in the plurality of symbols. The UWB transmitter may transmit the data packet via UWB radio frequency (RF) signals during a UWB ranging session between the UWB transmitter and a UWB receiver.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless device may perform a listen-before-talk (LBT) procedure for a narrowband communication that provides time and frequency synchronization and/or scheduling information for an ultra-wideband (UWB) communication. The wireless device may transmit the narrowband communication in response to the LBT procedure being successful. The wireless device may transmit the UWB communication based at least in part on the time and frequency synchronization and/or scheduling information. Numerous other aspects are described.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a responding device may receive a signal from an initiating device. The responding device may estimate, from the signal, a channel impulse response (CIR) that represents signal reflections from one or more objects as multiple taps. The responding device may select one or more taps, from the multiple taps, that are within a first time window that starts at a first offset from a reference point and that has a first specified time duration. The responding device may transmit, to the initiating device, a CIR report that indicates the one or more taps. Numerous other aspects are described.

Abstract: A device (e.g., a wireless device) may obtain a set of encoded bits, and select a set of symbol locations for puncturing. The device may then obtain and transmit modulated symbols based on the puncturing. For example, the device may encode information bits according to a convolutional code rate. In some cases, the encoded bits may be punctured (e.g., via a puncturing matrix with each column including either all 1's or all 0's) and the set of punctured bits may be mapped to symbols. In other cases, the encoded bits may be mapped to symbols, and the symbols may be punctured (e.g., via a puncturing matrix). The puncturing matrix may be identified based on a desired punctured code rate, the convolutional code rate used to encode the information bits, and whether or not the puncturing is to be applied before or after symbol mapping.

Abstract: Using the modulation scheme and/or coding techniques of traditional BLE may limit not only the data rate, but also limit the amount that the transmit power of a BLE air interface packet can be reduced due to receiver sensitivity. Namely, the lowest signal power level from which a receiving device may obtain information without meeting a BER threshold may limit the amount that the transmit power at the transmitter side can be reduced. There exists a need to transmit a BLE air interface packet using a modulation rate that is greater than 1 Mbps or 2 Mbps, enables a further reduction in transmit power, and/or enables an increase in receiver sensitivity. The present disclosure provides a solution by applying a coding technique and a PSK modulation scheme to a BLE air interface packet that increases data rate and reduces the sensitivity of the receiving device as compared to traditional BLE.

Abstract: Systems and methods are directed to phase modulation of polar coordinates in a transmitter of wireless signals, to achieve high transmit power levels while meeting spectral mask and EVM requirements. An input signal is mapped to a sequence of modulation frequency (e.g., O-QPSK to MSK) to generate a mapped signal. A digital frequency shaping filter is applied to the mapped signal to generate a shaped signal. An adaptive rounding algorithm is applied to the shaped signal to generate a reduced bit-width signal. A digital frequency synthesizer is applied to the reduced bit-width signal to generate an analog waveform for transmission.

Abstract: Systems and methods are directed to low cost and low power carrier frequency offset (CFO) estimation in a receiver. In-phase (I) and quadrature (Q) samples of a wireless signal are received by the receiver and a first phase and a second phase are extracted from the outputs of a first autocorrelator with a first time-lag and a second autocorrelator with a second time-lag. The extracted first and second phases are combined to generate an estimated CFO of high accuracy and wide estimation range.

Abstract: Systems and methods are directed to phase modulation of polar coordinates in a transmitter of wireless signals, to achieve high transmit power levels while meeting spectral mask and EVM requirements. An input signal is mapped to a sequence of modulation frequency (e.g., O-QPSK to MSK) to generate a mapped signal. A digital frequency shaping filter is applied to the mapped signal to generate a shaped signal. An adaptive rounding algorithm is applied to the shaped signal to generate a reduced bit-width signal. A digital frequency synthesizer is applied to the reduced bit-width signal to generate an analog waveform for transmission.

Abstract: Methods and systems for hardware-efficient carrier sensing are disclosed. The method may include receiving a received signal during a detection window, generating a phase-discriminated waveform based on the received signal, determining a plurality of absolute values respectively based on a plurality of correlations of the phase-discriminated waveform, and generating a detection metric based on a peak value of the plurality of absolute values.

Abstract: In one aspect, a method for estimating residual carrier frequency offset (CFO) in a phase-modulated wireless signal having pseudo noise (PN) spreading is provided. The method includes receiving, at a digital transceiver, a plurality of PN spread blocks of in-phase and quadrature (I/Q) samples of the phase-modulated wireless signal and performing sample-level de-rotation, symbol-level de-spreading, and sign alignment. The method also includes estimating a phase difference and determining an estimated residual CFO based on the phase difference.

Abstract: In an embodiment, a receiver detects a timing error between a transmitter clock at a transmitter and a receiver clock at a receiver associated with an exchange of CPM signals. The receiver phase aligns input samples of a candidate received signal over a time window based on a rotating signal corresponding to a phase progression of the candidate received signal. The receiver generates first and second partial sums of the phase-aligned input samples that are accumulations of phase-aligned input samples corresponding to modulation symbols that contribute positive and negative phases, respectively, to the phase progression. The receiver determines a phase difference between the first and second partial sums, and generates a timing-error metric that is indicative of a timing error between the transmitter clock and the receiver clock based at least in part upon the determined phase difference.

Abstract: A method for setting an initial gain and an initial offset for an automatic gain and offset controller (AGOC) is described. The method includes determining a gain level at which a signal does not under-saturate or over-saturate an input to an analog-to-digital converter (ADC) by performing a binary search over a fixed set of gain levels while an offset is fixed. The method also includes determining an offset correction to bring an unmodulated carrier level at an output of the ADC to a target level. The method may also include updating the gain and the offset in response to changes in a signal level.

Abstract: A method for inductively-coupled communications is described. The method includes receiving a signal. The method also includes analyzing the signal to estimate a symbol timing error. Estimating the symbol timing error may include comparing a location of a pause, a low-to-high or a high-to-low transition in the received signal with an ideal location of a pause or a transition. The method further includes adjusting symbol timing to correct for the symbol timing error.

Abstract: A method includes demodulating a load modulated signal at an initiator device based at least partially on a phase adjusted comparison value corresponding to the load modulated signal.