Efficient peak-to-average-power reduction for OFDM and MIMO-OFDM
AssigneeTybalt, LLC
InventorSteve Shattil
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Abstract
Certain aspects of the present disclosure generally relate to wireless communications. In some aspects, a wireless device reduces a peak-to-average power ratio (PAPR) of a discrete-time orthogonal frequency division multiplexing (OFDM) transmission by selecting a signal with low PAPR from a set of candidate discrete-time OFDM signals. The wireless device may generate a partial-update discrete-time OFDM signal by performing a sparse transform operation on a base data symbol sequence, and then linearly combine the partial-update discrete-time OFDM signal with a base discrete-time OFDM signal to produce an updated discrete-time OFDM signal, which is added to the set of candidate discrete-time OFDM signals. Numerous other aspects are provided.
Claims21
A method for reducing a peak-to-average power ratio (PAPR) of a discrete-time orthogonal frequency division multiplexing (OFDM) signal by selecting a signal with low PAPR from a plurality of candidate discrete-time OFDM signals, the method comprising:
- generating a partial update discrete-time OFDM signal by performing a sparse invertible transform operation on a base data symbol sequence;
- and
- linearly combining a base discrete-time OFDM signal and the partial update discrete-time OFDM signal to produce an updated discrete-time OFDM signal, the updated discrete-time OFDM signal being designated as one of the plurality of candidate discrete-time OFDM signals;
- wherein the base discrete-time OFDM signal is generated by performing a dense invertible transform operation on the base data symbol sequence or is selected from a previous updated discrete-time OFDM signal.
An apparatus for reducing a peak-to-average power ratio (PAPR) of a discrete-time signal by selecting a signal with low PAPR from a set of candidate discrete-time signals, comprising:
- a memory;
- and one or more processors operatively coupled to the memory, the one or more processors configured to:
- generate a partial update discrete-time signal by performing a sparse transform operation on a base data symbol sequence;
- and
- linearly combine a base discrete-time signal and the partial update discrete-time signal to produce an updated discrete-time signal, the updated discrete-time signal being included in the set of candidate discrete-time signals;
- wherein the base discrete-time OFDM signal is generated by performing a dense invertible transform operation on the base data symbol sequence or is selected from a previous updated discrete-time OFDM signal.
A non-transitory computer-readable medium storing one or more instructions for reducing a peak-to-average power ratio (PAPR) of a transmitted discrete-time signal by selecting a signal with low PAPR from a set of candidate discrete-time signals, the one or more instructions, when executed by one or more processors, cause the one or more processors to:
- generate a partial update discrete-time signal by performing a sparse transform operation on a base data symbol sequence;
- and
- linearly combine a base discrete-time signal and the partial update discrete-time signal to produce an updated discrete-time signal, the updated discrete-time signal being included in the set of candidate discrete-time signals;
- wherein the base discrete-time OFDM signal is generated by performing a dense invertible transform operation on the base data symbol sequence or is selected from a previous updated discrete-time OFDM signal.
Dependencies are inferred from the claim text.