US 10,122,560 B2 · Tree search tone reservation for PAPR reduction in OFDM systems

Abstract

An OFDM transmitter comprising an input for acquiring or receiving a signal to be transmitted, an output for transmitting a PAPR reduced version of the signal, a processor and memory storing code for execution by the processor. The processor, when executing the code, is configure to determine a plurality of possible values of tone reservation, hereinafter referred to as TR, tones for use in TR based PAPR reduction and to perform a tree search over some or all of the possible values under a first constraint that the average power per TR tone does not exceed the average power per tone used for data transmission and a second constraint that selected values for the TR tones reduce PAPR.

Claims13

Dependent claims

A tone reservation (TR) method for reducing PAPR (peak-to-average power ratio) of an OFDM (orthogonal frequency division multiplexing) signal, comprising:

determining a plurality of possible TR tone values for use with a data signal by:
determining a first search radius so that, for a search sphere centered on the data signal and having the first search radius, the possible values for the TR tones within the sphere satisfy a first constraint that the average power of the TR tones does not exceed the average power of the tones used for data transmission;
determining a second search radius so that, for a search sphere centered on the data signal and having the second search radius, the possible values for the TR tones within the sphere satisfy a second constraint that the values reduce PAPR;
and
performing a search over some or all of the possible TR tone values within the first search radius and the second search radius until a stopping criteria is met.

2 more elements

A PAPR (peak-to average power ratio) reducing unit for an OFDM (orthogonal frequency division multiplexing) transmitter, the PAPR reducing unit comprising:

an input for acquiring or receiving a data signal to be transmitted;
an output for transmitting a PAPR reduced version of the signal;
a processor;
and
a memory storing code for execution by the processor;
the processor, when executing the code, configured to:
determine a plurality of possible tone reservation (TR) tones values for use with a data signal;
determine a first search radius so that, for a search sphere centered on the data signal and having the first search radius, the possible values for the TR tones within the sphere satisfy a first constraint that the average power of the TR tones does not exceed the average power of the tones used for data transmission;
determine a second search radius so that, for a search sphere centered on the data signal and having the second search radius, the possible values for the TR tones within the sphere satisfy a second constraint that the values reduce PAPR;
and
perform a search over some or all of the possible TR tone values with the first search radius and second search radius until a stopping criteria is met.

8 more elements

Dependencies are inferred from the claim text.

Tree search tone reservation for PAPR reduction in OFDM systems

Life of this patent

Tree search tone reservation for PAPR reduction in OFDM systems

Life of this patent

Abstract

Claims13