The estimation and mitigation of swept-tone interferers includes receiving a composite signal comprising a signal of interest and a swept-tone interferer over an observation bandwidth or a hop bandwidth in a frequency-hopping system. The estimation of the interfering signal may be based on modeling the interferer as a magnitude periodic signal comprising non-overlapping, contiguous epochs, where each epoch may comprise a common pulse shape and a distinct phase rotation. The modeling may be based over the observation bandwidth, the hop bandwidth, or after combining the signal over all the frequency hop bandwidths. The period of the magnitude-periodic signal may be initially determined, and the common pulse shape and each of the distinct phase rotations may then be estimated. These estimates may be used to reconstruct an estimate of the swept-tone interferer, which may be subtracted from the composite signal to generate an interference-mitigated signal of interest.

Methods and apparatuses for signaling pulse shaping in a wireless communication system. A method of BS includes determining a spectral extension index (SEIndex) and a frequency domain spectral shaping type index (FDSSTypeIndex) for at least one transmission time interval (TTI) and transmitting, to a UE, the SEIndex and the FDSSTypeIndex. The method further includes receiving, from the UE, uplink (UL) data based on a spectral extension (SE) ratio associated with the SEIndex and frequency domain spectral shaping (FDSS) values. The FDSS values are associated with the FDSSTypeIndex.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, an apparatus may receive an indication of a selected digital pre-distortion (DPD) kernel from multiple DPD kernels. The apparatus may store multiple envelope values associated of with samples of an in-phase/quadrature (I/Q) signal and select a subset of envelope values based at least in part on the selected DPD kernel. The apparatus may generate, using the subset of envelope values and a look-up-table (LUT) component, an envelope computation value. The apparatus may store multiple computational values associated with the samples and select, based at least in part on the selected DPD kernel, at least one subset of computational values. The apparatus may generate an output sample that includes DPD based at least in part on combining the envelope computation value with the at least one subset of computational values. Numerous other aspects are described.

A PAPR optimization method for digital FM radio transmission is disclosed. The method includes generating an Orthogonal Frequency-Division Multiplexed (OFDM) signal for transmission and applying an adaptive PAPR reduction algorithm to the generated signal. The method further includes determining a Modulation Error Ratio (MER) for one or more frequency sidebands and iteratively adjusting PAPR reduction parameters based on the measured MER values. The adjustment includes optimizing the number of PAPR reduction iterations for a highest-power primary digital sideband, optimizing QAM constellation constraint limits, and adjusting convergence bias weight settings for a lowest-power primary digital sideband and/or secondary digital sidebands to maintain target MER values. The method further includes updating PAPR reduction parameters in real-time until the measured MER values meet predefined target thresholds and executing instructions to coordinate the operation of an optimization servomechanism, ensuring dynamic PAPR optimization across multiple transmission modes.

A method for dedicated short-range communication, DSRC, of an on-board unit, OBU, with at least two beacons, each beacon using a different channel for transmitting a respective carrier signal, comprises: receiving a receive signal comprising the carrier signals of the beacons; downconverting the receive signal to obtain a downconverted signal; filtering all of said different channels out of the downconverted signal to obtain a filtered signal; modulating an OBU response onto the filtered signal to obtain a response signal; upconverting the response signal to obtain an upconverted signal; and transmitting the upconverted signal to the beacons. An OBU is configured to carry out a DSRC with at least two beacons.

Methods, systems, and devices for wireless communications are described. The method may include a user equipment (UE) transmitting a first signal using a first waveform type. After transmitting the first signal using the first waveform type, the UE may identify a trigger event for waveform type switching by the UE and select a waveform type from among a set of waveform types based on identifying the trigger event. The UE may then transmit a second signal using the selected waveform type.

An apparatus (10, 110) comprising: means for transmitting, to a second apparatus (120), first information (1901) indicative of a capability of the apparatus to adapt at least one of: a frequency-domain spectral shaping (1902), FDSS, filter for FDSS-based orthogonal frequency division multiplexing, OFDM, transmission, or a spectral extension parameter (1903) for use in FDSS-based OFDM with spectral extension transmission; means for receiving, from the second apparatus based at least in part on the transmitted first information, second information (1904), wherein the second information comprises information for configuring the apparatus to adapt at least one of the FDSS filter (1905) or the spectral extension parameter (1906); means for determining an adaptation to apply to at least one of the FDSS filter or the spectral extension parameter, wherein the determination is based at least in part on the received second information, and wherein the adaptation comprises adapting at least one of: at least one of a plurality of filter coefficients (1909) of the FDSS filter, at least one of one or more filter parameters (1910), or the spectral extension parameter (1903, 1911); and means for transmitting, to the second apparatus, at least one FDSS-based OFDM transmission (1914), wherein the transmitting uses at least one of: the FDSS filter with the determined adaptation applied thereto, or the spectral extension parameter with the determined adaptation applied thereto.