A compander including a module configured to compress a range of amplitudes of a signal in accordance with a companding function derived using a calculus of variations approach and method for deriving the companding function.

Techniques related to a data processing engine for an integrated circuit (IC) are described. In an example, a method is provided for vectorized peak detection. The method includes dividing a set of data samples of a data signal, corresponding to a peak detection window (PDW), into a plurality of subsets of data samples each comprising a number of data samples. The method includes performing vector operations on each of the plurality of subsets of data samples. The method includes determining a running index of a sample with a maximum amplitude over the PDW based on the vector operations.

A peak suppression circuit includes a memory, and a processor coupled to the memory and the processor configured to suppress a first peak of a transmission signal according to a first sampling signal having a predetermined period, delay the transmission signal where the first peak is suppressed by a predetermined time corresponding to a period shorter than the predetermined period, and suppress a second peak of the delayed transmission signal according to a second sampling signal having the predetermined period.

A compander including a module configured to compress a range of amplitudes of a signal in accordance with a companding function derived using a calculus of variations approach and method for deriving the companding function.

A system for peak-to-average-power ratio (PAPR) reduction of a frequency shifted plurality of digital broadcast signals taking into account the combined signal peaks in order to transmit the signals more efficiently in a single broadcast transmission system. The PAPR algorithm takes into account a rotating constellation phase offset for the shifted signals corresponding to the amount of applied frequency shift. In the case of a dual sideband In-Band-On-Channel (IBOC) signal typically used in conjunction with an FM carrier in the center, the sidebands can be interleaved to create a new IBOC signal definition and take the place of the FM carrier for an all-digital transmission that is backward compatible with IBOC receivers allowing for a gradual migration to all digital broadcasting.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may generate an input signal including information for transmission over a wireless channel. The UE may perform a first waveform shaping stage on the input signal to increase an in-band emissions ratio and reduce a peak-to-average power ratio (PAPR) of the input signal. The UE may perform a second waveform shaping stage on the output of the first waveform shaping stage to reduce an adjacent channel leakage ratio of the output of the first waveform shaping stage. The UE may then transmit a signal over the wireless channel based on an output of the second waveform shaping stage.

Methods, systems, and devices for wireless communications are described. The described methods, systems, and devices may include sampling an input signal to obtain one or more signal windows. An amplitude of a first sample within a first signal window of the one or more signal windows may be determined to exceed an amplitude threshold. A series of cancellation pulses may be combined with the first sample within the first signal window to obtain a reduced signal, the reduced signal including one or more reduced samples each having an amplitudes within the amplitude threshold. The series of cancellation pulses may be based on a characteristic of the first sample. The reduced signal may then be transmitted. The series of cancellation pulses may be based on, for example, an envelope of the first sample. In some cases, the series of cancellation pulses may be based on a phase of the first sample.

Embodiments of the present disclosure provide an apparatus of reducing a peak-to-average ratio of a multi-carrier signal to be transmitted in a wireless communication system. The apparatus comprises a multi-carrier processing circuitry, a storage and a peak cancellation circuitry. The multi-carrier processing circuitry is configured to process a plurality of signals on respective carriers and to combine the processed plurality of signals into a multi-carrier signal to be transmitted. The multi-carrier processing circuitry is further configured to process an injected impulse to obtain an impulse response of the multi-carrier processing circuitry. The storage is configured to store the impulse response as a clipping pulse. The peak cancellation circuitry is configured to apply the clipping pulse to the multi-carrier signal to cancel a peak of the multi-carrier signal whose amplitude is over a predetermined threshold.

The disclosure provides a circuit. The circuit includes an IFFT (inverse fast fourier transform) block. The IFFT block generates a modulated signal in response to a data signal. A clip logic block is coupled to the IFFT block, and generates a clipped signal in response to the modulated signal. A first subtractor is coupled to the clip logic block and the IFFT block, and subtracts the modulated signal from the clipped signal to generate an error signal. A cyclic filter is coupled to the first subtractor, and filters the error signal to generate a filtered error signal. A second subtractor is coupled to the cyclic filter and the IFFT block. The second subtractor subtracts the filtered error signal from the modulated signal to generate a processed signal.

A computer-implemented method for reducing crest factor by an electronic device includes: receiving a plurality of first samples of a first input signal. The plurality of first samples are generated at a first sampling rate. A first peak detection is performed based on the plurality of first samples to generate a plurality of first peak detection output samples. A plurality of first windowing input samples are generated at a second sampling rate by downsampling the plurality of first peak detection output samples. A plurality of first windowing output samples are generated based on the plurality of first windowing input samples. A plurality of first peak reduction samples are generated at the first sampling rate by upsampling the plurality of first windowing output samples. A first output signal is generated based on the plurality of first samples and the plurality of first peak reduction samples.