Transmission method of orthogonal frequency division multiplexing signals and transmission device

An orthogonal frequency division and signal multiplexing technology, which is applied in the field of communication, can solve problems such as OFDM signal transmission distortion, reduce OFDM signal transmission rate, and reduce system spectral efficiency, so as to reduce peak-to-average ratio, reduce spectral efficiency, and reduce transmission speed effect

Inactive Publication Date: 2010-07-07
CHINA MOBILE COMM GRP CO LTD
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  • Abstract
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Problems solved by technology

The application of these existing technologies for reducing the peak-to-average ratio of OFDM signals will either cause OFDM signal transmis...

Method used

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  • Transmission method of orthogonal frequency division multiplexing signals and transmission device
  • Transmission method of orthogonal frequency division multiplexing signals and transmission device
  • Transmission method of orthogonal frequency division multiplexing signals and transmission device

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Embodiment Construction

[0022] The transmission scheme of the OFDM signal proposed by the embodiment of the present invention is that the sending end and the receiving end pre-agreed on the block rule and the phase shifting rule, so that during the transmission process of the OFDM signal, both the sending end and the receiving end can perform OFDM according to the agreed rules. Signal sending and receiving. Therefore, the peak-to-average ratio of the OFDM system can be reduced, and there is no need to send sideband information, and the implementation complexity is low.

[0023] The solution of the present invention will be described in detail below in conjunction with specific examples.

[0024] figure 2 It is a schematic flow diagram of the OFDM signal transmission method proposed by the embodiment of the present invention, and the specific flow is described as follows:

[0025] Step 21, the sending end performs serial-to-parallel conversion on the OFDM symbol sequence to be sent;

[0026] For e...

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Abstract

The present invention discloses a transmission method of orthogonal frequency division multiplexing signals and a transmission device. The transmission method comprises the following steps: orthogonal frequency division multiplexing sequences which wait for transmitting are deserialized by a sending end; sub carrier data of each path obtained by deserializing is partitioned according to partitioned regulation engaged with a receiving end in advance; sub carrier data blocks of each path obtained by partitioning are respectively shifted in phase according to phase shifting regulation engaged with the receiving end in advance; after phase shifting, the sub carrier data blocks of each path are respectively made in fourier inversion; and time signals of each path obtained after the fourier inversion are superimposed to be sent. By using the scheme of the present invention, on the premise that the spectrum effectiveness of an orthogonal frequency division multiplexing (OFDM) system can not reduced, the peak-to-average power ratio of the OFDM system is reduced by lower complexity.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for transmitting an OFDM signal. Background technique [0002] In an Orthogonal Frequency Division Multiplex (OFDM, Orthogonal Frequency Division Multiplex) system, according to the central limit theorem, N OFDM signals with equal carrier spacing can be equivalent to a mean value of 0 and a variance of δ 2 Gaussian distribution of , where N is large enough, for example, N>100. Therefore, at some extreme moments, different subcarriers are superimposed linearly in phase and time, which may produce some large amplitude pulse peaks; although the probability of pulse peaks will decrease as the number of subcarriers N increases, the peak will increase, so in the OFDM system, the peak-to-average power ratio (PAPR, Peak-to-Average PowerRatio) of the signal fluctuates greatly, and this puts forward very high requirements on the linear power amplifier of the ...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04J11/00
Inventor 骆晓亮朱春梅任鹏马君
Owner CHINA MOBILE COMM GRP CO LTD
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