Technique for Peak Power Reduction
First Claim
1. A method of peak power reduction in a transmitter stage configured to generate a stream of single-carrier frequency-division multiple access (SC-FDMA) modulated symbols, including cyclic prefix insertion, whereby a set of M input symbols are dynamically mapped onto a set of N orthogonal subcarriers, wherein M<
- N, and whereby to each of the remaining (N-M) subcarriers a predefined value is allocated, the method comprising;
receiving the modulated signal stream in a time domain representation;
evaluating a power distribution of the modulated signal stream in the time domain to detect one or more power peaks; and
processing the one or more power peaks detected in the modulated signal stream taking into account the dynamically changing subcarrier mapping such that one or more spectral portions consisting of the (N-M) subcarriers to which the predefined value has been allocated are left essentially undisturbed.
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Abstract
A peak power reduction technique for a transmitter stage configured to map a set of input symbols onto a set of orthogonal subcarriers to generate a modulated signal is proposed. The technique can be adaptively implemented responsive to a dynamically changing subcarrier allocation. In a method realization, the technique comprises the steps of receiving the modulated signal in a time domain representation, evaluating a power distribution of the modulated signal in the time domain to detect one or more power peaks, and processing the one or more peaks detected in the modulated signal taking into account the dynamically changing subcarrier mapping.
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Citations
20 Claims
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1. A method of peak power reduction in a transmitter stage configured to generate a stream of single-carrier frequency-division multiple access (SC-FDMA) modulated symbols, including cyclic prefix insertion, whereby a set of M input symbols are dynamically mapped onto a set of N orthogonal subcarriers, wherein M<
- N, and whereby to each of the remaining (N-M) subcarriers a predefined value is allocated, the method comprising;
receiving the modulated signal stream in a time domain representation; evaluating a power distribution of the modulated signal stream in the time domain to detect one or more power peaks; and processing the one or more power peaks detected in the modulated signal stream taking into account the dynamically changing subcarrier mapping such that one or more spectral portions consisting of the (N-M) subcarriers to which the predefined value has been allocated are left essentially undisturbed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- N, and whereby to each of the remaining (N-M) subcarriers a predefined value is allocated, the method comprising;
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14. (canceled)
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15. A transmitter stage comprising:
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a modulator configured to generate a stream of single-carrier frequency division multiple accesss (SC-FDMA) modulated symbols, including cyclic prefix insertion, whereby a set of M input symbols are dynamically mapped onto a set of N orthogonal subcarriers, wherein M<
N, and whereby to each of the remaining (N-M) subcarriers a predefined value is allocated;a peak detector configured to evaluate a power distribution of the modulated signal stream in the time domain to detect one or more power peaks; and a processor configured to process the one or more power peaks detected in the modulated signal stream taking into account the dynamically changing subcarrier mapping such that one or more spectral portions consisting of the (N-M) subcarriers to which the predefined value has been allocated are left essentially undisturbed. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification