Method for peak to average power ratio reduction
AssigneeIntel Corporation
InventorVladimir Kravtsov
Life of this patent
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Abstract
According to various embodiments, methods, apparatuses and systems are provided to allow a transmitter to reduce the Peak to Average Power Ratio (PAPR) of a modulated signal by applying a pre-emphasis filter to the signal, clipping the pre-distorted signal to reduce the PAPR, and applying a de-emphasis filter to the clipped signal to reduce the spectral leakage caused by the clipping. Other embodiments may be disclosed or claimed.
Claims16
A wireless transmitter including circuitry to process a signal prior to wireless transmission of the signal, the circuitry comprising:
- a digital pre-emphasis filter configured to receive the signal within a frequency band, and to apply a distortion to the signal;
- a clipping module, coupled to the digital pre-emphasis filter, configured to reduce magnitude of components of the signal that are above a predefined threshold;
- a de-emphasis filter, coupled to the clipping module, configured to reduce spectral leakages in the signal outside of the frequency band caused by the clipping module, and reverse the distortion of the signal caused by the digital pre-emphasis filter within the frequency band;
- and
- a digital to analog converter, coupled to the de-emphasis filter, configured to convert the signal after de-emphasis by the de-emphasis filter.
A method for processing, by circuitry of a wireless transmitter, a signal prior to wireless transmission of the signal by the wireless transmitter, the method comprising:
- receiving the signal, wherein the signal is a digital signal and occupies a frequency band;
- applying a pre-emphasis filter to the signal to distort the signal;
- limiting magnitudes of components of the signal that are above a predefined threshold;
- after applying the pre-emphasis filter to the signal and after limiting magnitudes of components of the signal that are above the predefined threshold, applying a de-emphasis filter to the signal to reduce out-of-band emission caused by said limiting, and reverse the distortion of the signal caused by the digital pre-emphasis filter within the frequency band;
- and
- after applying the de-emphasis filter to the signal, converting the signal from digital to analog form.
A system comprising:
- an antenna;
- and
- a transmitter coupled to the antenna to transmit data over a wireless network, the transmitter including circuitry to process a signal prior to wireless transmission of the signal, wherein the signal is a digital signal, the circuitry comprising:
- a digital pre-emphasis filter configured to receive the signal and to apply a distortion to the signal, wherein the signal is to be transmitted over the wireless network via the antenna;
- a clipping module, coupled to the digital pre-emphasis filter, configured to limit complex magnitude of components of the signal that are above a predefined threshold;
- a de-emphasis filter, coupled to the clipping module, configured to reduce out-of-band emissions of the signal caused by the clipping module, and reverse in-band distortion of the signal caused by the digital pre-emphasis filter;
- and
- a digital to analog converter, coupled to the de-emphasis filter, to convert the signal after de-emphasis of the signal by the de-emphasis filter.
Dependencies are inferred from the claim text.