US8588276B2

5G,4G

Title

METHODS AND SYSTEMS FOR OFDM USING CODE DIVISION MULTIPLEXING

Application Number:

US201113333463

Publication Date:

19-11-2013

Current Assignee:

APPLE INC , NORTEL NETWORKS LIMITED

Family ID:

37052928

Application Date:

30-03-2005

Publication Country:

US

View on Espacenet

Priority Date:

21-12-2011

Declaring Company:

APPLE INC , NORTEL NETWORKS LIMITED

Abstract  Abstract

In some embodiments of the invention, OFDM symbols are transmitted as a plurality of clusters. A cluster includes a plurality of OFDM sub-carriers in frequency, over a plurality of OFDM symbol durations in time. Each cluster includes data as well as pilot information as a reference signal for channel estimation. In some embodiments, a plurality of clusters collectively occupy the available sub-carrier set in the frequency domain that is used for transmission. In some embodiments of the invention data and/or pilots are spread within each cluster using code division multiplexing (CDM). In some embodiments pilots and data are separated by distributing data on a particular number of the plurality of OFDM symbol durations and pilots on a remainder of the OFDM symbol durations. CDM spreading can be performed in time and/or frequency directions.

Note:

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The information in purple was extracted from the FrandAvenue

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Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.

Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.

Family member:related patents or applications that share a common priority or original filing.

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