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Method and device for reducing peak-to-average power ratio in filter-bank multi-carrier system

A multi-carrier system and filter bank technology, applied in multi-carrier systems, modulated carrier systems, multi-frequency code systems, etc. Improve the effective transmit power, reduce the peak-to-average ratio, and reduce the effect of nonlinear distortion

Inactive Publication Date: 2013-01-30
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there is a problem that the peak-to-average power ratio (Peak-to-Average Power Ratio: PAPR) of the transmitted signal is too high in the FBMC system
Excessive peak-to-average ratio will easily lead to large power loss, especially on the user equipment side, which will be very unfavorable
In addition, if the peak-to-average ratio is too high, it will easily lead to nonlinear distortion of the transmitted signal during the power amplification stage, which should also be avoided.

Method used

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  • Method and device for reducing peak-to-average power ratio in filter-bank multi-carrier system
  • Method and device for reducing peak-to-average power ratio in filter-bank multi-carrier system

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Embodiment Construction

[0026] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] Fig. 1 shows a signal flow diagram in a transmitting device of an existing FBMC system. As shown in the figure, in the existing FBMC system, after channel coding is performed on the information bits, constellation modulation 110 is first performed on the data to be transmitted, and the manner of constellation modulation 110 can be multiple phase-shift keying (Multiple phase-shift keying: MPSK) or quadrature amplitude modulation (Quadrature Amplitude Modulation: QAM), etc., are used to convert data bits into constellation symbols. Then perform serial-to-parallel conversion (not shown in the figure) on the obtained constellation symbols, and perform offset quadrature amplitude modulation 130 (Offset-Quadrature Amplitude Modulation: OQAM) on the vector composed of K constellation symbols, where the parameter K represents The number of subca...

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Abstract

The invention relates to a method for reducing a peak-to-average power ratio in a filter-bank multi-carrier system. The method comprises the following steps of: 210, performing constellation modulation on data to be transmitted; 220, performing K-point discrete Fourier transformation on K vectors consisting of constellation symbols obtained by the constellation modulation; and 230, performing offset quadrature amplitude modulation on data vectors obtained through discrete Fourier transformation, wherein the parameter K represents the number of sub carriers distributed for transmission of the data to be transmitted. By the scheme, under the condition that the increase of operations is low, the peak-to-average power ratio of a signal can be obviously reduced, so that the efficiency of a power amplification circuit is improved, the effective emission power is increased, and the nonlinear distortion of the signal in a power amplification stage is reduced.

Description

technical field [0001] The invention relates to a wireless communication network, in particular to a method for reducing peak-to-average ratio in a filter bank multi-carrier system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) has been used in fourth generation mobile communication systems. However, the out-of-band radiation of OFDM is strong, the overhead of the guard band is large, and the frequency resolution is limited. These shortcomings limit the application of OFDM systems. The filter bank multi-carrier system (filter-bank multi-carrier: FBMC) may become an alternative to OFDM due to its fast out-of-band subcarrier spectrum attenuation and small interference to adjacent subcarriers. [0003] In addition, the advantages of the FBMC system include eliminating the need for cyclic prefixes, improving spectral efficiency, and being robust to time-frequency synchronization errors. [0004] However, there is a problem in the FBMC system ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2621H04L27/3411H04L25/08H04L27/362H04L27/26H04L27/38H04L27/2614H04L27/2636H04L27/2654H04L27/26416
Inventor 李栋
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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