US Patent No. 10,433,309

ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS FOR WIRELESS LOCAL AREA NETWORK


Patent No. 10,433,309
Issue Date October 01, 2019
Title Orthogonal Frequency Division Multiple Access For Wireless Local Area Network
Inventorship Hongyuan Zhang, Fremont, CA (US)
Yakun Sun, San Jose, CA (US)
Hui-Ling Lou, Sunnyvale, CA (US)
Liwen Chu, San Ramon, CA (US)
Assignee Marvell World Trade Ltd., St. Michael (BB)

Claim of US Patent No. 10,433,309

1. A method, comprising:assigning, at a communication device, a plurality of different orthogonal frequency division multiplex (OFDM) tone blocks for a wireless local area network (WLAN) communication channel to a plurality of communication devices, including assigning a first OFDM tone block to a first communication device, assigning a second OFDM tone block to a second communication device, assigning a third OFDM tone block to a third communication device, and assigning a fourth OFDM tone block to a fourth communication device, wherein:
the first OFDM tone block spans a first frequency bandwidth less than or equal to 10 MHz,
the first OFDM tone block is within a first subchannel that spans a frequency bandwidth of 20 MHz,
the second OFDM tone block spans a second frequency bandwidth less than or equal to 10 MHz,
the second OFDM tone block is within the first subchannel,
the third OFDM tone block spans a third frequency bandwidth less than or equal to 10 MHz,
the third OFDM tone block is within a second subchannel that spans a frequency bandwidth of 20 MHz,
the fourth OFDM tone block spans a fourth frequency bandwidth less than or equal to 10 MHz, and
the fourth OFDM tone block is within the second subchannel; and
generating, at the communication device, an orthogonal frequency division multiple access (OFDMA) physical layer (PHY) data unit for transmission in the WLAN communication channel, including:
generating a PHY preamble portion of the OFDMA PHY data unit that spans at least the first subchannel and the second subchannel, the PHY preamble portion including a legacy preamble portion that spans at least the first subchannel and the second subchannel, wherein the legacy preamble portion includes i) a first instance of a legacy signal field that spans the first subchannel and ii) a second instance of the legacy signal field that spans the second subchannel, and
generating a data portion of the OFDMA PHY data unit, the data portion including respective independent data for the plurality of devices modulated to respective OFDM tone blocks, including i) first data for the first communication device modulated to the first OFDM tone block within the first subchannel, ii) second data for the second communication device modulated to the second OFDM tone block within the first subchannel, iii) third data for the third communication device modulated to the third OFDM tone block within the second subchannel, and iv) fourth data for the fourth communication device modulated to the fourth OFDM tone block within the second subchannel.