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Peak-to-average ratio restraining method and device in multi-carrier orthogonal frequency division multiplexing system

A technology of peak-to-average ratio suppression and orthogonal frequency division, which is applied in multi-frequency code systems and other directions

Active Publication Date: 2012-06-06
HUAWEI TECH CO LTD
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  • Abstract
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Problems solved by technology

[0009] Through the above analysis, we can see that Figure 1 shows that the clipping scheme using matched filtering cannot be directly applied to multi-carrier OFDM systems, and there is no effective peak-to-average ratio suppression for multi-carrier OFDM systems. plan

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  • Peak-to-average ratio restraining method and device in multi-carrier orthogonal frequency division multiplexing system
  • Peak-to-average ratio restraining method and device in multi-carrier orthogonal frequency division multiplexing system
  • Peak-to-average ratio restraining method and device in multi-carrier orthogonal frequency division multiplexing system

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Embodiment Construction

[0039] In order to make the objects and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0040] figure 2 It is a functional block diagram of a peak-to-average ratio suppression method in a multi-carrier OFDM system according to an embodiment of the present invention. figure 2 The two carriers are shown as an example. The baseband frequency domain signals of carrier 1 and carrier 2 are first multi-carrier combined to form a multi-carrier combined channel signal, and then the index evaluation is performed. If the index evaluation passes, it is directly sent to the intermediate frequency channel for subsequent processing. , if the index evaluation fails, the clipping noise is extracted from the multi-carrier combined channel signal, and the extracted clipping noise is mapped and assigned to carrier 1 and carrier 2. Carrier 1 dete...

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Abstract

The invention discloses a method for inhibiting the peak-to-average ratio in a multi-carrier orthogonal frequency division multiplexing system. The method comprises: combining the baseband frequency area signal of each carrier as the combined channel signal of the time area multi-carrier on each OFDM sign; extracting the cutting noise mapping of the multi-carrier combined channel signal in the length span and distributing to each multi-carrier; cutting the analogy pulse signal of the channel length from the lengthen core kernel wave shape and rotating the phase position of the deforming coefficients on the sub carrier for each carrier vacant space TR ccording to the position of the multi-carrier combined channel signal in the cutting noise; reversely adding the delayed noise to the multi-carrier combined channel signal to baseband frequency area signal to inhibit the peak-to-average ratio. The invention also provides a device for inhibiting the peak-to-average ratio in the OFDM system. The invention can effectively inhibit the peak-to-average ratio by simple process in the multi-carrier OFDM system.

Description

technical field [0001] The present invention relates to Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology, in particular to a method and device for peak-to-average ratio suppression in a multi-carrier OFDM system. Background technique [0002] Among the existing communication technologies, OFDM technology has become the key to the fourth generation of mobile communication due to its high frequency utilization rate, strong anti-intersymbol interference (ISI, Inter Symbol Interference) and carrier interference (ICI, Inter Carrier Interference) capabilities. technology. [0003] For the single-carrier technology, at the transmitting end of the OFDM signal, if the single carrier includes N sub-carriers, the high-speed data stream is divided into N parallel sub-data streams after serial-to-parallel conversion, and the inverse Fourier transform (IFFT, Inverse Fast Fourier Transform), which converts the frequency domain signal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 邹志强武杰张彬彬
Owner HUAWEI TECH CO LTD
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