Invention Grant
- Patent Title: Preamble design for television white space transmissions
- Patent Title (中): 电视空白传输的序言设计
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Application No.: US13471947Application Date: 2012-05-15
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Publication No.: US08830815B2Publication Date: 2014-09-09
- Inventor: Sameer Vermani , Santosh Paul Abraham , Stephen J. Shellhammer , Albert van Zelst , Didier Johannes Richard van Nee , Vincent Knowles Jones, IV
- Applicant: Sameer Vermani , Santosh Paul Abraham , Stephen J. Shellhammer , Albert van Zelst , Didier Johannes Richard van Nee , Vincent Knowles Jones, IV
- Applicant Address: US CA San Diego
- Assignee: Qualcomm Incorporated
- Current Assignee: Qualcomm Incorporated
- Current Assignee Address: US CA San Diego
- Agent S. Hossain Beladi
- Main IPC: H04J11/00
- IPC: H04J11/00 ; H04L5/00 ; H04L29/06 ; H04L27/26 ; H04W4/00
Abstract:
A method for generating a Physical Layer Convergence Protocol Packet Data Unit (PPDU) having a preamble and a payload for television white space transmission (TVWS) is provided. The symbols of the PPDU each include 128 total (orthogonal frequency-division multiplexing) OFDM tones or 256 total OFDM tones. The preamble includes a signal (SIG) field symbol having 108 OFDM data tones if the symbols of the PPDU include 128 total OFDM tones or having 234 OFDM data tones if the symbols of the PPDU include 256 total OFDM tones. The SIG field symbol indicates at least one of an amount of data in the payload or a length of time that the PPDU will occupy the television broadcast frequency spectrum. The PPDU is generated by down-clocking an 802.11ac signal by a factor so that the bandwidth of the PPDU decreases down to one appropriate for use in a TVWS channel.
Public/Granted literature
- US20130128807A1 PREAMBLE DESIGN FOR TELEVISION WHITE SPACE TRANSMISSIONS Public/Granted day:2013-05-23
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