Invention Grant
- Patent Title: Spreading and precoding in OFDM
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Application No.: US16864709Application Date: 2020-05-01
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Publication No.: US11018917B1Publication Date: 2021-05-25
- Inventor: Steve Shattil
- Applicant: Genghiscomm Holdings, LLC
- Applicant Address: US CO Boulder
- Assignee: Genghiscomm Holdings, LLC
- Current Assignee: Genghiscomm Holdings, LLC
- Current Assignee Address: US CO Boulder
- Agent Steven J Shattil
- Main IPC: H04L27/26
- IPC: H04L27/26 ; H04L12/24 ; H04L12/28 ; H04W72/04 ; H04B7/0456 ; H04L12/707 ; H04J13/00 ; H04L12/801 ; H04B7/024 ; H04W52/42 ; H04B7/026 ; H04B7/0452 ; H04B7/06 ; H04J11/00 ; H04J13/12 ; H04L5/00 ; H04B7/185 ; H04W88/02 ; H04W84/18

Abstract:
An OFDM transmitter spreads original data symbols with a complex-valued spreading matrix derived from a discrete Fourier transform. Spread data symbols are mapped to OFDM subcarriers. Spreading and mapping are configured to produce a transmitted spread-OFDM signal with a low peak-to-average power ratio (PAPR) and orthogonal code spaces. In MIMO systems, the complex-valued spreading matrix can comprise a MIMO precoding matrix, and the code spaces can comprise MIMO subspaces. In Cooperative-MIMO, a combination of low code-space cross correlation and low PAPR can be achieved.
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