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US 8,509,324 B2Granted
Methods and systems for reducing PAPR of an OFDM signal
AssigneeQUALCOMM Incorporated
InventorsJe Woo Kim, Ayman Fawzy Naguib, Jong Hyeon Park, Tae Ryun Chang
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Abstract
Certain embodiments of the present disclosure provide a method and an apparatus for peak-to-average power ratio (PAPR) reduction of a transmission signal in a single carrier frequency division multiple access (SC-FDMA) system. The method may utilize a permutation of a time domain signal, and/or a permutation of a frequency domain signal or a permutation of a signal transformed by a unitary matrix. The apparatus may include an M-point DFT or some other M×M unitary matrix, N-point IDFT, interpolation and frequency conversion units, and a pair of possibly different permutation matrices of size M×M, where M can be less or equal than N.
Claims32
A method for transmitting data in a wireless communication system using orthogonal frequency division multiplexing (OFDM), comprising:
- performing a serial-to-parallel conversion of modulated symbols for the data to obtain a first sequence of samples;
- performing a time-to-frequency transformation of the first sequence of samples to obtain a second sequence of samples, wherein the time-to-frequency transformation comprises:
- performing a first cyclic permutation of the first sequence of samples utilizing a first cyclic permutation matrix to obtain a permuted sequence of samples;
- performing a transformation involving a unitary matrix on the permuted sequence of samples to obtain a transformed sequence of samples;
- and
- performing a second cyclic permutation of the transformed sequence of samples utilizing a second cyclic permutation matrix to obtain the second sequence of samples, wherein the first cyclic permutation matrix is characterized by a first index i, and the second cyclic permutation matrix is characterized by a second index j, and wherein the first index i and the second index j are each determined by simulations where a particular set of matrices are used for a particular modulation type;
- and
- generating an OFDM symbol for transmission from the second sequence of samples.
5 more elements
An apparatus for wireless communications using orthogonal frequency division multiplexing (OFDM), comprising:
- at least one processor configured to:
- perform serial-to-parallel conversion of modulated symbols for the data to obtain a first sequence of samples;
- perform a time-to-frequency transformation of the first sequence of samples to obtain a second sequence of samples at least in part by:
- performing a first cyclic permutation of the first sequence of samples utilizing a first cyclic permutation matrix to obtain a permuted sequence of samples;
- performing a transformation involving a unitary matrix on the permuted sequence of samples to obtain a transformed sequence of samples;
- and
- performing a second cyclic permutation of the transformed sequence of samples utilizing a second cyclic permutation matrix to obtain the second sequence of samples, wherein the first cyclic permutation matrix is characterized by a first index i, and the second cyclic permutation matrix is characterized by a second index j, and wherein the first index i and the second index j are each determined by simulations where a particular set of matrices are used for a particular modulation type;
- and
- generate an OFDM symbol for transmission from the second sequence of samples;
- and
- a memory coupled to the at least one processor.
8 more elements
An apparatus for wireless communications using orthogonal frequency division multiplexing (OFDM), comprising:
- means for performing a serial-to-parallel conversion of modulated symbols for the data to obtain a first sequence of samples;
- means for performing a time-to-frequency transformation of the first sequence of samples to obtain a second sequence of samples, wherein the means for performing the time-to-frequency transformation comprises:
- means for performing a first cyclic permutation of the first sequence of samples utilizing a first cyclic permutation matrix to obtain a permuted sequence of samples;
- means for performing a transformation involving a unitary matrix on the permuted sequence of samples to obtain a transformed sequence of samples;
- and
- means for performing a second cyclic permutation of the transformed sequence of samples utilizing a second cyclic permutation matrix to obtain the second sequence of samples, wherein the first cyclic permutation matrix is characterized by a first index i, and the second cyclic permutation matrix is characterized by a second index j, and wherein the first index i and the second index j are each determined by simulations where a particular set of matrices are used for a particular modulation type;
- and
- means for generating an OFDM symbol for transmission from the second sequence of samples.
5 more elements
A computer-program product for processing data for transmission in a wireless communication system using orthogonal frequency division multiplexing (OFDM) comprising a non-transitory computer readable medium having a set of instructions stored thereon, the set of instructions being executable by one or more processors and the set of instructions comprising:
- instructions for performing a serial-to-parallel conversion of modulated symbols for the data to obtain a first sequence of samples;
- instructions for performing a time-to-frequency transformation of the first sequence of samples to obtain a second sequence of samples, wherein the instructions for performing the time-to-frequency transformation comprise:
- instructions for performing a first cyclic permutation of the first sequence of samples utilizing a first cyclic permutation matrix to obtain a permuted sequence of samples;
- instructions for performing a transformation involving a unitary matrix on the permuted sequence of samples to obtain a transformed sequence of samples;
- and
- instructions for performing a second cyclic permutation of the transformed sequence of samples utilizing a second cyclic permutation matrix to obtain the second sequence of samples, wherein the first cyclic permutation matrix is characterized by a first index i, and the second cyclic permutation matrix is characterized by a second index j, and wherein the first index i and the second index j are each determined by simulations where a particular set of matrices are used for a particular modulation type;
- and
- instructions for generating an OFDM symbol for transmission from the second sequence of samples.
5 more elements
A method for transmitting data in a wireless communication system using orthogonal frequency division multiplexing (OFDM), comprising:
- performing a serial-to-parallel conversion of modulated symbols for the data to obtain a first sequence of samples;
- performing a time-to-frequency transformation of the first sequence of samples to obtain a second sequence of samples, wherein the time-to-frequency transformation comprises:
- performing a first cyclic permutation of the first sequence of samples utilizing a first cyclic permutation matrix to obtain a permuted sequence of samples;
- performing a transformation involving a unitary matrix on the permuted sequence of samples to obtain a transformed sequence of samples;
- and
- performing a second cyclic permutation of the transformed sequence of samples utilizing a second cyclic permutation matrix to obtain the second sequence of samples, wherein the first cyclic permutation matrix is characterized by a first index i, and the second cyclic permutation matrix is characterized by a second index j, and wherein the first index i and the second index j are each determined by selecting values that result in minimum peak-to-average power ratio (PAPR) values for a particular modulation type;
- and
- generating an OFDM symbol for transmission from the second sequence of samples.
5 more elements
An apparatus for wireless communications using orthogonal frequency division multiplexing (OFDM), comprising:
- at least one processor configured to:
- perform serial-to-parallel conversion of modulated symbols for the data to obtain a first sequence of samples;
- perform a time-to-frequency transformation of the first sequence of samples to obtain a second sequence of samples at least in part by:
- performing a first cyclic permutation of the first sequence of samples utilizing a first cyclic permutation matrix to obtain a permuted sequence of samples;
- performing a transformation involving a unitary matrix on the permuted sequence of samples to obtain a transformed sequence of samples;
- and
- performing a second cyclic permutation of the transformed sequence of samples utilizing a second cyclic permutation matrix to obtain the second sequence of samples, wherein the first cyclic permutation matrix is characterized by a first index i, and the second cyclic permutation matrix is characterized by a second index j, and wherein the first index i and the second index j are each determined by selecting values that result in minimum peak-to-average power ratio (PAPR) values for a particular modulation type;
- and
- generate an OFDM symbol for transmission from the second sequence of samples;
- and
- a memory coupled to the at least one processor.
8 more elements
An apparatus for wireless communications using orthogonal frequency division multiplexing (OFDM), comprising:
- means for performing a serial-to-parallel conversion of modulated symbols for the data to obtain a first sequence of samples;
- means for performing a time-to-frequency transformation of the first sequence of samples to obtain a second sequence of samples, wherein the means for performing the time-to-frequency transformation comprises:
- means for performing a first cyclic permutation of the first sequence of samples utilizing a first cyclic permutation matrix to obtain a permuted sequence of samples;
- means for performing a transformation involving a unitary matrix on the permuted sequence of samples to obtain a transformed sequence of samples;
- and
- means for performing a second cyclic permutation of the transformed sequence of samples utilizing a second cyclic permutation matrix to obtain the second sequence of samples, wherein the first cyclic permutation matrix is characterized by a first index i, and the second cyclic permutation matrix is characterized by a second index j, and wherein the first index i and the second index j are each determined by selecting values that result in minimum peak-to-average power ratio (PAPR) values for a particular modulation type;
- and
- means for generating an OFDM symbol for transmission from the second sequence of samples.
5 more elements
A computer-program product for processing data for transmission in a wireless communication system using orthogonal frequency division multiplexing (OFDM) comprising a non-transitory computer readable medium having a set of instructions stored thereon, the set of instructions being executable by one or more processors and the set of instructions comprising:
- instructions for performing a serial-to-parallel conversion of modulated symbols for the data to obtain a first sequence of samples;
- instructions for performing a time-to-frequency transformation of the first sequence of samples to obtain a second sequence of samples, wherein the instructions for performing the time-to-frequency transformation comprise:
- instructions for performing a first cyclic permutation of the first sequence of samples utilizing a first cyclic permutation matrix to obtain a permuted sequence of samples;
- instructions for performing a transformation involving a unitary matrix on the permuted sequence of samples to obtain a transformed sequence of samples;
- and
- instructions for performing a second cyclic permutation of the transformed sequence of samples utilizing a second cyclic permutation matrix to obtain the second sequence of samples, wherein the first cyclic permutation matrix is characterized by a first index i, and the second cyclic permutation matrix is characterized by a second index j, and wherein the first index i and the second index j are each determined by selecting values that result in minimum peak-to-average power ratio (PAPR) values for a particular modulation type;
- and
- instructions for generating an OFDM symbol for transmission from the second sequence of samples.
5 more elements
Dependencies are inferred from the claim text.