Wireless transmission apparatus and peak power suppressing method in multicarrier transmission

A technology of wireless transmission and peak power, applied in multiplexing communication, modulated carrier system, multi-frequency code system, etc., can solve problems such as deterioration, signal distortion, and high peak power, and prevent the decline of transmission efficiency and reduce Effect of peak power and throughput reduction prevention
CN1886923AInactive Publication Date: 2006-12-27PANASONIC CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PANASONIC CORP
Publication Date
2006-12-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

A wireless transmission apparatus wherein peak power can be suppressed without degradation of throughput and that of transmission efficiency in a multicarrier transmission. In the apparatus, an encoding part (11) encodes data to be transmitted. A modifying part (12) modifies the encoded data to produce a symbol. An assigning part (13) assigns the symbol to one of a plurality of subcarriers that will constitute a multicarrier signal. A changing part (15) changes the phases of the plurality of subcarriers within a range that does not exceed a determination boarder line of signal points on the I-Q plane. An IFFT part (16) produces the multicarrier signal by use of a high-speed inverse Fourier transformation.
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Description

technical field

[0001] The invention relates to a wireless sending device and a peak power suppressing method in multi-carrier communication. Background technique

[0002] In mobile communications, there is an increasing demand for high-speed transmission of various media such as audio, video, and data. Therefore, OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) and MC-CDMA (Multi Carrier-Code Division Multiple Access, multi-carrier- Code Division Multiple Access) and other multi-carrier communications.

[0003] However, in multi-carrier communication using a plurality of subcarriers, when the phases of the subcarriers match, the peak power becomes very large compared to the average power. When the peak power increases, the signal is distorted due to the limitation of the linear amplifier, thereby deteriorating the transmission characteristics (for example, BER: Bit Error Rate, bit error rate). Therefore, in order to avoid the ...

Claims

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