Systems and Methods for SC-FDMA Diversity Transmission
AssigneeApple Inc.
InventorsMing Jia, Jianglei Ma, Peiying Zhu, Wen Tong, Hua Xu, Hang Zhang
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Abstract
The present application provides methods, devices and transmitters that mitigate increases in peak to average power ratio (PAPR) from transmission diversity in a single carrier frequency division multiple access (SC-FDMA) modulated uplink. A PAPR preserving precode matrix hopping method that utilizes cyclic shift delays is provided, as well as a sub-band based transmit diversity scheme. The present application also provides methods, devices and transmitters that relax the scheduling restrictions associated with uplink scheduling in the LTE standard.
Claims14
A method for transmit diversity on a SC-FDMA modulated uplink channel, comprising:
- for each of a plurality of antennas:
- precoding a sequence of SC-FDMA modulated symbols based on hopping through a time domain precoding vector that is different for each antenna, and
- transmitting the plurality of precoded SC-FDMA modulated symbols.
An apparatus for transmit diversity on a SC-FDMA modulated uplink channel, comprising:
- for each of a plurality of antenna:
- means for precoding a sequence of SC-FDMA modulated symbols based on hopping through a time domain precoding vector that is different for each antenna, and
- means for transmitting the plurality of precoded SC-FDMA modulated symbols.
An apparatus for transmit diversity on a SC-FDMA modulated uplink channel, comprising:
- a pair of antennas;
- and
- a processor in communication with the pair of antennas, wherein the processor is configured for:
- precoding a sequence of SC-FDMA modulated symbols based on hopping through a time domain precoding vector that is different for each antenna, and
- transmitting the plurality of precoded SC-FDMA modulated symbols.
Dependencies are inferred from the claim text.