Waveform for internet-of-things data transfer
AssigneeIntel Corporation
InventorsShahrnaz Azizi, Hosein Nikopour, Thomas J. Kenney
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Abstract
Described herein are waveform designs and systems that enable low-power narrow bandwidth operations by battery powered Internet-of-Things devices in an 802.11ax environment. In one embodiment, a single carrier waveform is frequency multiplexed within 802.11ax OFDM transmissions in both the downlink and uplink. The single-carrier waveform provides a low peak-to-average-power-ratio to lower the overall power consumption of the battery powered devices.
Claims25
An apparatus for a wireless access point (AP), the apparatus comprising:
- memory and processing circuitry, wherein the processing circuitry is to:
- generate a single-carrier (SC) waveform that comprises a baseband carrier frequency modulated by data to be transmitted to a low-power station (LP-STA);
- generate an orthogonal frequency division multiple access (OFDMA) waveform that includes data to be transmitted to one or more wireless stations (STAs) wherein the data for each of the one or more STAs is carried by one or more allocated resource units (RUs), each RU comprising a group of contiguous OFDMA subcarriers;
- and,
- frequency multiplex the SC and OFDMA waveforms, wherein the SC waveform has a bandwidth corresponding to one or more RUs within the OFDMA waveform.
A method for operating a wireless access point (AP), the apparatus comprising:
- encoding a trigger frame to request uplink transmissions from the LP-STA and from one or more STAs, the trigger frame indicating which RUs are allocated to each of the one or more STAs for its uplink transmission;
- receiving a composite baseband waveform in response to the trigger frame that comprises an SC waveform added to an OFDMA waveform;
- OFDMA demodulating the composite baseband waveform to extract data carried by subcarriers of the OFDMA waveform, discarding subcarriers of the OFDMA waveform within a specified bandwidth on either side of the baseband carrier frequency of the SC, and recovering data transmitted from the one or more STAs;
- and,
- filtering the composite baseband waveform to extract the SC waveform therefrom and demodulating the SC waveform to recover data transmitted from the LP-STA.
A computer-readable medium comprising instructions to cause a wireless access point (AP), upon execution of the instructions by processing circuitry of the AP, to:
- generate a single-carrier (SC) waveform that comprises a baseband carrier frequency modulated by data to be transmitted to a low-power station (LP-STA);
- generate an orthogonal frequency division multiple access (OFDMA) waveform that includes data to be transmitted to one or more wireless stations (STAs) wherein the data for each of the one or more STAs is carried by one or more allocated resource units (RUs), each RU comprising a group of contiguous OFDMA subcarriers;
- and,
- frequency multiplex the SC and OFDMA waveforms, wherein the SC waveform has a bandwidth corresponding to one or more RUs within the OFDMA waveform.
Dependencies are inferred from the claim text.