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.
Claims5
A method for uplink adaptive sub-channelization in an SC-FDMA modulated uplink, the method comprising:
- assigning a wireless device a plurality of non-contiguous sub-bands for SC-FDMA modulated uplink transmission based on an operating power headroom of the wireless device.
A method in a base station for adaptation of an SC-FDMA modulated uplink connection of a MIMO-capable wireless device, comprising:
- monitoring an operating power headroom of the wireless device;
- when the wireless device has sufficient operating power headroom, scheduling multi-codeword rank-1 transmission based on channel strength or at least rank-2 transmission.
An apparatus for uplink adaptive sub-channelization in an SC-FDMA modulated uplink, the method comprising:
- means for assigning a wireless device a plurality of non-contiguous sub-bands for SC-FDMA modulated uplink transmission based on an operating power headroom of the wireless device.
The apparatus of claim 15 further comprising:
- means for determining sub-carriers on which the wireless device has fading peaks, wherein the means for assigning the wireless device a plurality of non-contiguous sub-bands comprises means for assigning the wireless device a plurality of non-contiguous sub-bands for SC-FDMA modulated uplink transmissions based on the operating power headroom of the wireless device and the sub-carriers on which the wireless device has fading peaks.
Dependencies are inferred from the claim text.