Apparatus and method for reduced peak-to-average-power ratio in a wireless network
First Claim
1. For use in a wireless network, a subscriber station configured to communicate with the wireless network according to a multi-carrier protocol, the subscriber station comprising:
- a size M Fourier Transform (FT) block configured to receive input symbols and generating therefrom M FT pre-coded outputs; and
a spectral shaping filter block configured to receive the M FT pre-coded outputs and generating therefrom a plurality of spectrally shaped outputs;
wherein the subscriber station configures the spectral shaping filter block based on whether a first packet to be transmitted to the wireless network comprises control information or user data such that, when the first packet comprises user data, the subscriber station configures the spectral shaping filter block to perform spectral shaping according to a peak-to-average power (PAPR) value associated with the first packet, and when the first packet comprises control information, the subscriber station configures the spectral shaping filter block to operate as a filter type known at an intended receiver of the first packet to be used only with control information, wherein the control information comprises at least one parameter associated with the spectral shaping of user data packets.
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Abstract
A wireless transmission device capable of communicating with a receiver according to a DFT-spread OFDM protocol. The wireless transmission device comprises a configurable spectral shaping filter block capable of performing spectral shaping of an outgoing signal. The wireless transmission device configures the configurable spectral shaping filter block to perform spectral shaping according to a peak-to-average power (PAPR) value associated with the outgoing signal. The multi-carrier protocol comprises one of orthogonal frequency division multiple access (OFDMA) and orthogonal frequency division multiplexing (OFDM).
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Citations
20 Claims
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1. For use in a wireless network, a subscriber station configured to communicate with the wireless network according to a multi-carrier protocol, the subscriber station comprising:
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a size M Fourier Transform (FT) block configured to receive input symbols and generating therefrom M FT pre-coded outputs; and a spectral shaping filter block configured to receive the M FT pre-coded outputs and generating therefrom a plurality of spectrally shaped outputs; wherein the subscriber station configures the spectral shaping filter block based on whether a first packet to be transmitted to the wireless network comprises control information or user data such that, when the first packet comprises user data, the subscriber station configures the spectral shaping filter block to perform spectral shaping according to a peak-to-average power (PAPR) value associated with the first packet, and when the first packet comprises control information, the subscriber station configures the spectral shaping filter block to operate as a filter type known at an intended receiver of the first packet to be used only with control information, wherein the control information comprises at least one parameter associated with the spectral shaping of user data packets. - View Dependent Claims (2, 3, 4, 5, 6)
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7. For use in a wireless network, a subscriber station configured to communicate with the wireless network according to a multi-carrier protocol, the subscriber station comprising:
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a size M Fourier Transform (FT) block configured to receive input symbols and generating therefrom M FT pre-coded outputs; and a spectral shaping filter block configured to receive the M FT pre-coded outputs and generating therefrom a plurality of spectrally shaped outputs; wherein the subscriber station determines whether a modulation technique used by the subscriber station is at least equal to a specified modulation order and, in response to a determination that the modulation technique is at least equal to the specified modulation order, configures the spectral shaping filter block so that spectral shaping is not performed, and wherein the subscriber station configures the spectral shaping filter block based on whether a first packet to be transmitted to the wireless network comprises control information or user data such that, when the first packet comprises user data, the subscriber station configures the spectral shaping filter block to perform spectral shaping according to a peak-to-average power (PAPR) value associated with the first packet, and when the first packet comprises control information, the subscriber station configures the spectral shaping filter block to operate as a filter type known at an intended receiver of the first packet to be used only with control information, wherein the control information comprises at least one parameter associated with the spectral shaping of user data packets. - View Dependent Claims (8, 9, 10)
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11. A wireless transmission device configured to communicate with a receiver according to a multi-carrier protocol using orthogonal frequencies, the wireless transmission device comprising:
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a spectral shaping filter block configured to perform spectral shaping on an outgoing signal, wherein the wireless transmission device configures the spectral shaping filter block based on whether a first packet in the outgoing signal comprises control information or user data such that, when the first packet comprises user data, the wireless transmission device configures the spectral shaping filter block to perform spectral shaping according to a peak-to-average power (PAPR) value associated with the first packet, and when the first packet comprises control information, the wireless transmission device configures the spectral shaping filter block to operate as a filter type known at an intended receiver of the first packet to be used only with control information, wherein the control information comprises at least one parameter associated with the spectral shaping of user data packets. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A wireless transmission device configured to communicate with a receiver according to a multi-carrier protocol using orthogonal frequencies, the wireless transmission device comprising:
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a spectral shaping filter block configured to perform spectral shaping on an outgoing signal, wherein; the wireless transmission device determines whether a modulation technique used by the wireless transmission device is at least equal to a specified modulation order and, in response to a determination that the modulation technique is at least equal to the specified modulation order, configures the spectral shaping filter block so that spectral shaping is not performed; and the wireless transmission device configures the spectral shaping filter block based on whether a first packet in the outgoing signal comprises control information or user data such that, when the first packet comprises user data, the wireless transmission device configures the spectral shaping filter block to perform spectral shaping according to a peak-to-average power (PAPR) value associated with the first packet, and when the first packet comprises control information, the wireless transmission device configures the spectral shaping filter block to operate as a filter type known at an intended receiver of the first packet to be used only with control information, wherein the control information comprises at least one parameter associated with the spectral shaping of user data packets. - View Dependent Claims (18, 19, 20)
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Specification