Modified uf-ofdm for enhanced wi-fi iot ul transmission
AssigneeIntel Corporation
InventorsShahrnaz AZIZI, Thomas J. KENNEY, Eldad PERAHIA
Life of this patent
Estimating the term…
Abstract
The devices and methods herein can produce a new waveform for transmission that is robust to carrier frequency offset (CFO) errors, and hence, enables implementation of low cost and low power consumption local oscillators at the Internet of Things (IoT) devices. The proposed method builds upon the existing 802.11ax OFDMA architecture, and adds block filtering to each resource unit to reduce out of band (OOB) emissions. Embodiments also define a modified Universal Filtered OFDM (UF-OFDM) technique that adds a Guard Interval (GI) to UF-OFDM, and thus, provides a GI-UF-OFDM architecture. The added GI helps prevent inter-symbol interference (ISI) at the receiver.
Claims20
A wireless device that transmits using an orthogonal frequency division multiplexing access (OFDMA) structure defined by the IEEE 802.11ax standard, the wireless device comprising:
- a local oscillator;
- transmit circuitry configured to:
- generate a signal for transmission on a resource unit (RU) frequency block as defined by the 802.11ax standard;
- add a guard interval to a symbol in the signal;
- and
- block transmit filter the signal based on the RU bandwidth of the OFDMA structure, as defined by the IEEE 802.11ax standard.
A receiving wireless device that receives signals based on an orthogonal frequency division multiplexing access (OFDMA) structure defined by the 802.11ax standard, the receiving wireless device comprising:
- receive circuitry configured to:
- receive a signal from a transmitting device, wherein the signal has been block transmit filtered based on a resource unit (RU) bandwidth of the OFDMA structure, as defined by the IEEE 802.11ax standard used by the transmitting device and has been modified;
- and
- window the received signal;
- remove a guard interval inserted into the received signal;
- and
- ingest data in the signal.
A method performed by a wireless device, the method comprising:
- receiving data comprising two or more symbols;
- mapping the data to a IEEE 802.11ax resource unit (RU) size;
- performing an Inverse Fast Fourier Transform (IFFT) on the data;
- adding a guard interval to each of the two or more symbols;
- and
- block filtering the data based on a bandwidth associated with a resource unit (RU) of a orthogonal frequency division multiplexing access (OFDMA) structure, as defined by the IEEE 802.11ax standard, used by the wireless device for transmission of data.
Dependencies are inferred from the claim text.