Modulation scheme for low peak average power ratio (PAPR)
AssigneeZte Corporation
InventorsYu Xin, Guanghui Yu, Jian Hua
Life of this patent
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Abstract
Methods, apparatus, and systems for reducing Peak Average Power Ratio (PAPR) in signal transmissions are described. In one example aspect, a wireless communication method includes determining, for an input sequence of coefficients, an output sequence and generating a waveform using the output sequence. The output sequence corresponds to an output of a convolutional modulation between a three-coefficient function associated with 2 2 , 1, and 2 2 and an intermediate sequence. The intermediate sequence is generated by inserting zero coefficients between coefficients of the input sequence of coefficients.
Claims17
A method for wireless communication, comprising:
- determining, for an input sequence of coefficients that is generated by mapping data bits to constellation points according to a π/2-Binary Phase Shift Keying (BPSK) modulation scheme, an output sequence;
- and
- generating a waveform using the output sequence;
- wherein the output sequence corresponds to an output of a convolutional modulation between a three-coefficient function having values
- 2
- 2
- ,
- 1, and
- 2
- 2
- and an intermediate sequence,
- wherein the intermediate sequence is generated by inserting a zero coefficient between each pair of adjacent coefficients of the input sequence,
- wherein the convolutional modulation comprises a multi-path delay operation, and wherein the multi-path delay operation comprises:
- generating multiple delayed sequences based on the intermediate sequence using different delay values;
- and
- computing a weighted sum of the multiple delayed sequences using the three-coefficient function.
A wireless communication method, comprising:
- receiving a sequence generated by a convolutional modulation between a three-coefficient function having values
- 2
- 2
- ,
- 1, and
- 2
- 2
- and an intermediate sequence, wherein the intermediate sequence is generated by inserting a zero coefficient between each adjacent pair of coefficients of an input sequence of coefficients that is generated by mapping data bits to constellation points according to a π/2-Binary Phase Shift Keying (BPSK) modulation scheme,
- wherein the convolutional modulation comprises a multi-path delay operation, and wherein the multi-path delay operation comprises:
- generating multiple delayed sequences based on the intermediate sequence using different delay values;
- and
- computing a weighted sum of the multiple delayed sequences using the three-coefficient function;
- and
- demodulating the received sequence to determine the input sequence.
A wireless communication apparatus comprising a processor and a memory storing instructions, execution of which by the processor causes the apparatus to:
- determine, for an input sequence of coefficients that is generated by mapping data bits to constellation points according to a π/2-Binary Phase Shift Keying (BPSK) modulation scheme, an output sequence;
- and
- generate a waveform using the output sequence;
- wherein the output sequence corresponds to an output of a convolutional modulation between a three-coefficient function having values
- 2
- 2
- ,
- 1, and
- 2
- 2
- and an intermediate sequence,
- wherein the intermediate sequence is generated by inserting a zero coefficient between each pair of adjacent coefficients of the input sequence,
- wherein the convolutional modulation comprises a multi-path delay operation, and wherein the multi-path delay operation comprises:
- generating multiple delayed sequences based on the intermediate sequence using different delay values;
- and
- computing a weighted sum of the multiple delayed sequences using the three-coefficient function.
A wireless communication apparatus comprising a processor and a memory storing instructions, execution of which by the processor causes the apparatus to:
- receive a sequence generated by a convolutional modulation between a three-coefficient function having values
- 2
- 2
- ,
- 1, and
- 2
- 2
- and an intermediate sequence, wherein the intermediate sequence is generated by inserting a zero coefficient between each adjacent pair of coefficients of an input sequence of coefficients that is generated by mapping data bits to constellation points according to a π/2-Binary Phase Shift Keying (BPSK) modulation scheme,
- wherein the convolutional modulation comprises a multi-path delay operation, and wherein the multi-path delay operation comprises:
- generating multiple delayed sequences based on the intermediate sequence using different delay values;
- and
- computing a weighted sum of the multiple delayed sequences using the three-coefficient function;
- and
- demodulate the received sequence to determine the input sequence.
Dependencies are inferred from the claim text.