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AssigneeApple Inc.
InventorsJianglei Ma, Ming Jia, Wen Tong, Peiying Zhu, Hua Xu, Hang Zhang, Mo-Han Fong
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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.
An apparatus for implementation in a base station, the apparatus comprising:
A method for operating a base station, the method comprising:
A base station, the base station comprising:
Dependencies are inferred from the claim text.