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US 8,264,946 B2Granted
Methods and systems for PAPR reduction in SC-FDMA systems
AssigneeQUALCOMM Incorporated
InventorsMadihally J. Narasimha, Je Woo Kim, Yuanning Yu, Jong Hyeon Park
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Abstract
Certain embodiments of the present disclosure relate to methods for peak-to-average power ratio (PAPR) reduction of a transmission signal in a single carrier frequency division multiple access (SC-FDMA) system. The proposed methods and systems are based on manipulations of an SC-FDMA transmission signal in a time- and/or a frequency-domain.
Claims52
A transmission method for a communication system using single carrier frequency division multiple access (SC-FDMA), the transmission method comprising:
- performing a serial-to-parallel conversion of modulated symbols of data to obtain a first sequence of samples;
- performing a time-to-frequency transform on the first sequence of samples to obtain a second sequence of samples;
- performing a frequency-domain manipulation of the second sequence of samples to obtain a third sequence of samples;
- performing a frequency-to-time transform on the third sequence of samples to obtain a fourth sequence of samples, where a number of samples of the fourth sequence is greater than a number of samples of the second sequence;
- performing a parallel-to-serial conversion of the fourth sequence of samples to obtain a fifth sequence of samples;
- and
- transmitting the fifth sequence of samples over a wireless channel,
- wherein performing the frequency-domain manipulation of the second sequence of samples to obtain the third sequence of samples comprises permuting samples of the second sequence, expanding a bandwidth of the permuted samples of the second sequence, and filtering permuted samples of the second sequence with the expanded bandwidth, and wherein a number of samples of the third sequence is greater than the number of samples of the second sequence.
5 more elements
A transmission method for a communication system using single earner frequency division multiple access (SC-FDMA), the transmission method comprising:
- performing a serial-to-parallel conversion of modulated symbols of data to obtain a first sequence of samples;
- performing a time-domain manipulation of the first sequence of samples to obtain a second sequence of samples;
- performing a time-to-frequency transform on the second sequence of samples to obtain a third sequence of samples;
- pertaining a frequency-domain manipulation of the third sequence of samples to obtain a fourth sequence of samples;
- performing a frequency-to-time transform on the fourth sequence of samples to obtain a fifth sequence of samples, where a number of samples of the fifth sequence is greater than a number of samples of the third sequence;
- performing a parallel-to-serial conversion of the fifth sequence of samples to obtain a sixth sequence of samples;
- and
- transmitting the sixth sequence of samples over a wireless channel,
- wherein performing the time-domain manipulation of the first sequence of samples to obtain the second sequence of samples comprises rotating phases of samples of the first sequence.
6 more elements
An apparatus for a communication system using single carrier frequency division multiple access (SC-FDMA), the apparatus comprising:
- logic embodied in a processor for performing a serial-to-parallel conversion of modulated symbols of data to obtain a first sequence of samples;
- logic embodied in a processor for performing a time-to-frequency transform on the first sequence of samples to obtain a second sequence of samples;
- logic embodied in a processor for performing a frequency-domain manipulation of the second sequence of samples to obtain a third sequence of samples;
- logic embodied in a processor for performing a frequency-to-time transform on the third sequence of samples to obtain a fourth sequence of samples, where a number of samples of the fourth sequence is greater than a number of samples of the second sequence;
- logic embodied in a processor for performing a parallel-to-serial conversion of the fourth sequence of samples to obtain a fifth sequence of samples;
- and
- logic embodied in a processor for transmitting the fifth sequence of samples over a wireless channel,
- wherein the logic for performing the frequency-domain manipulation of the second sequence of samples to obtain the third sequence of samples comprises logic for permuting samples of the second sequence, logic for expanding a bandwidth of the permuted samples of the second sequence, and logic for filtering permuted samples of the second sequence with the expanded bandwidth, and wherein a number of samples of the third sequence is greater than the number of samples of the second sequence.
5 more elements
An apparatus for a communication system using single carrier frequency division multiple access (SC-FDMA), the apparatus comprising:
- logic embodied in a processor for performing a serial-to-parallel conversion of modulated symbols of data to obtain a first sequence of samples;
- logic embodied in a processor for performing a time-domain manipulation of the first sequence of samples to obtain a second sequence of samples;
- logic embodied in a processor for performing a time-to-frequency transform on the second sequence of samples to obtain a third sequence of samples;
- logic embodied in a processor for performing a frequency-domain manipulation of the third sequence of samples to obtain a fourth sequence of samples;
- logic embodied in a processor for performing a frequency-to-time transform on the fourth sequence of samples to obtain a fifth sequence of samples, where a number of samples of the fifth sequence is greater than a number of samples of the third sequence;
- logic embodied in a processor for performing a parallel-to-serial conversion of the fifth sequence of samples to obtain a sixth sequence of samples;
- and
- logic embodied in a processor for transmitting the sixth sequence of samples over a wireless channel,
- wherein the logic for performing the time-domain manipulation of the first sequence of samples to obtain the second sequence of samples comprises logic for rotating phases of samples of the first sequence.
6 more elements
An apparatus for a communication system using single earner frequency division multiple access (SC-FDMA), the apparatus comprising:
- means for performing a serial-to-parallel conversion of modulated symbols of data to obtain a first sequence of samples;
- means for performing a time-to-frequency transform on the first sequence of samples to obtain a second sequence of samples;
- means for performing a frequency-domain manipulation of the second sequence of samples to obtain a third sequence of samples;
- means for performing a frequency-to-time transform on the third sequence of samples to obtain a fourth sequence of samples, where a number of samples of the fourth sequence is greater than a number of samples of the second sequence;
- means for performing a parallel-to-serial conversion of the fourth sequence of samples to obtain a fifth sequence of samples;
- and
- means for transmitting the fifth sequence of samples over a wireless channel,
- wherein the means for performing the frequency-domain manipulation of the second sequence of samples to obtain the third sequence of samples comprises means for permuting samples of the second sequence, means for expanding a bandwidth of the permuted samples of the second sequence, and means for filtering permuted samples of the second sequence with the expanded bandwidth, and wherein a number of samples of the third sequence is greater than the number of samples of the second sequence.
5 more elements
An apparatus for a communication system using single carrier frequency division multiple access (SC-FDMA), the apparatus comprising:
- means for performing a serial-to-parallel conversion of modulated symbols of data to obtain a first sequence of samples;
- means for performing a time-domain manipulation of the first sequence of samples to obtain a second sequence of samples;
- means for performing a time-to-frequency transform on the second sequence of samples to obtain a third sequence of samples;
- means for performing a frequency-domain manipulation of the third sequence of samples to obtain a fourth sequence of samples;
- means for performing a frequency-to-time transform on the fourth sequence of samples to obtain a fifth sequence of samples, where a number of samples of the fifth sequence is greater than a number of samples of the third sequence;
- means for performing a parallel-to-serial conversion of the fifth sequence of samples to obtain a sixth sequence of samples;
- and
- means for transmitting the sixth sequence of samples over a wireless channel,
- wherein the means for performing the time-domain manipulation of the first sequence of samples to obtain the second sequence of samples comprises means for rotating phases of samples of the first sequence.
6 more elements
A computer-program product for a communication system using single carrier frequency division multiple access (SC-FDMA), comprising a non-transitory computer-readable medium having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:
- instructions for performing a serial-to-parallel conversion of modulated symbols of data to obtain a first sequence of samples;
- instructions for performing a time-to-frequency transform on the first sequence of samples to obtain a second sequence of samples;
- instructions for performing a frequency-domain manipulation of the second sequence of samples to obtain a third sequence of samples;
- instructions for performing a frequency-to-time transform on the third sequence of samples to obtain a fourth sequence of samples, where a number of samples of the fourth sequence is greater than a number of samples of the second sequence;
- instructions for performing a parallel-to-serial conversion of the fourth sequence of samples to obtain a fifth sequence of samples;
- and
- instructions for transmitting the fifth sequence of samples over a wireless channel,
- wherein the instructions for performing the frequency-domain manipulation of the second sequence of samples to obtain the third sequence of samples comprise instructions for permuting samples of the second sequence, instructions for expanding a bandwidth of the permuted samples of the second sequence, and instructions for filtering permuted samples of the second sequence with the expanded bandwidth, and wherein a number of samples of the third sequence is greater than the number of samples of the second sequence.
5 more elements
A computer-program product for a communication system using single carrier frequency division multiple access (SC-FDMA), comprising a non-transitory computer-readable medium having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:
- instructions for performing a serial-to-parallel conversion of modulated symbols of data to obtain a first sequence of samples;
- instructions for performing a time-domain manipulation of the first sequence of samples to obtain a second sequence of samples;
- instructions for performing a time-to-frequency transform on the second sequence of samples to obtain a third sequence of samples;
- instructions for performing a frequency-domain manipulation of the third sequence of samples to obtain a fourth sequence of samples;
- instructions for performing a frequency-to-time transform on the fourth sequence of samples to obtain a fifth sequence of samples, where a number of samples of the fifth sequence is greater than a number of samples of the third sequence;
- instructions for performing a parallel-to-serial conversion of the fifth sequence of samples to obtain a sixth sequence of samples;
- and
- instructions for transmitting the sixth sequence of samples over a wireless channel,
- wherein the instructions for performing the time-domain manipulation of the first sequence of samples to obtain the second sequence of samples comprise instructions for rotating phases of samples of the first sequence.
6 more elements
Dependencies are inferred from the claim text.