Method and system for reduction of peak-to-average power ratio of transmission signals comprising overlapping waveforms
AssigneeAT&T Corp.
InventorsLeonard Joseph Cimini, JR., Nelson Ray Sollenberger
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Abstract
The present invention provides a method and system for reducing the peak to average power ratio (PAP) of a signal with low computational complexity. According to one embodiment, the present invention is applied to reduce the PAP of an OFDM signal. According to an alternative embodiment, the present invention, is applied to reduce the PAP of a CDMA signal. Rather than seeking the optimum solution, which involves significant computational complexity, the present invention provides for a number of sub-optimal techniques for reducing the PAP of an OFDM signal but with much lower computational complexity.
Claims18
A method for reducing a peak to average power ratio of a signal, comprising:
- calculating, by a processor, a first peak to average power ratio value of a combined signal comprising a combination of:
- each of a plurality of vectors associated with the signal being multiplied by a corresponding phase factor assigned to each of the plurality of vectors, wherein the phase factor comprises a binary value;
- and
- assigning, by the processor, a final phase factor to each of the plurality of vectors, wherein the final phase factor is assigned on a basis that the first peak to average power ratio of the combined signal will be minimized.
A transmitter, comprising:
- a transponder device;
- a memory;
- and
- a processor coupled to the memory and the transponder device, the processor configured to:
- calculate a first peak to average power ratio value of a combined signal comprising a combination of:
- each of a plurality of vectors associated with the signal being multiplied by a corresponding phase factor assigned to each of the plurality of vectors, wherein the phase factor comprises a binary value;
- and
- assign a final phase factor to each of the plurality of vectors, wherein the final phase factor is assigned on a basis that the first peak to average power ratio of the combined signal will be minimized.
An apparatus for reducing a peak to average power ratio of a signal comprising:
- a processor
- and a memory, the processor and the memory configured to perform operations, the operations comprising:
- calculating a first peak to average power ratio value of a combined signal comprising a combination of:
- each of a plurality of vectors associated with the signal being multiplied by a corresponding phase factor assigned to each of the plurality of vectors, wherein the phase factor comprises a binary value;
- and
- assigning a final phase factor to each of the plurality of vectors, wherein the final phase factor is assigned on a basis that the first peak to average power ratio of the combined signal will be minimized.
Dependencies are inferred from the claim text.