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Modulating method and modulating equipment for OFDM signal

A modulation method and signal technology, applied in the modulation carrier system, digital transmission system, electrical components, etc., can solve the problem of reducing the ability of CP-OFDM system to resist ISI and ICI, OFDM signal out-of-band attenuation speed is not fast enough, adjacent frequency band Data interference and other issues, to achieve the effect of suppressing out-of-band leakage and enhancing the ability to resist ISI and ICI

Active Publication Date: 2014-06-04
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One disadvantage of OFDM signals is that the out-of-band attenuation of the power spectrum is not fast enough, which will cause interference to adjacent frequency band data
At present, time-domain windowing and other schemes are usually used to suppress out-of-band power, but it is easy to reduce the ability of CP-OFDM system to resist ISI and ICI

Method used

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  • Modulating method and modulating equipment for OFDM signal
  • Modulating method and modulating equipment for OFDM signal
  • Modulating method and modulating equipment for OFDM signal

Examples

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Effect test

Embodiment 1

[0043] Such as figure 1 As shown, the embodiment of the present invention provides a modulation method of OFDM signal, including:

[0044] S101. Receive the current OFDM signal and the last adjusted OFDM signal;

[0045] In this application, the adjusted last OFDM signal refers to the last OFDM signal superimposed with noise signals.

[0046] S102. Generate a noise signal according to the received signal;

[0047] S103. Superimpose the noise signal on the current OFDM signal to generate an adjusted current OFDM signal, where the CP of the adjusted current OFDM signal is continuous with the tail of the adjusted previous OFDM signal.

[0048]The OFDM signal modulation method provided by the embodiments of the present invention, by superimposing the noise signal on the OFDM signal, makes the CP of the adjusted current OFDM signal continuous with the adjusted last OFDM signal, realizing the continuity between OFDM signals and effectively The out-of-band leakage is suppressed, a...

Embodiment 2

[0050] Such as figure 2 As shown, this embodiment may include the following steps:

[0051] S201. Receive the i-th OFDM signal and the adjusted i-1-th OFDM signal.

[0052] Call the i-th OFDM signal S i , the adjusted ith OFDM signal is called The adjusted i-1th OFDM signal is called Can be fetched from cache.

[0053] That is, after each OFDM signal superimposed with a noise signal is obtained, it needs to be buffered, refer to step S206. The OFDM signal superimposed with the noise signal can be regarded as an adjusted OFDM signal.

[0054] S202. Acquire a pulse-like Kernel signal corresponding to the ith OFDM signal.

[0055] Specifically, the generation method of the Kernel signal is as follows:

[0056] First, set an appropriate weight value w for each carrier of the OFDM signal k , must satisfy w k ≥0, and it is a non-negative real number, and then perform IFFT transformation to obtain the Kernel signal. The highest amplitude normalized Kernel signal for M-ra...

Embodiment 3

[0097] Such as Figure 5 As shown, this embodiment may include the following steps:

[0098] S501. Receive the current OFDM signal and the last OFDM signal;

[0099] S502. Generate a noise signal according to the received signal;

[0100] S503. Superimpose the noise signal on the current OFDM signal to generate an adjusted current OFDM signal; wherein, the CP of the adjusted current OFDM signal is continuous with the tail of the previous OFDM signal.

[0101] By superimposing the noise signal on the current OFDM signal, so that the CP of the previous OFDM signal is continuous with the tail of the previous OFDM signal, the out-of-band leakage can be effectively suppressed, and the ability of OFDM to resist ISI and ICI is enhanced.

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Abstract

A modulating method and modulating equipment for Orthogonal Frequency Division Multiplexing (OFDM) signal are provided by the embodiments of the invention in the wireless communication filed. The method includes: receiving the current OFDM signal and the previous OFDM signal or the adjusted previous signal; generating a noise signal according to the received signal; superposing the noise signal to the current OFDM signal and generating an adjusted current OFDM signal; wherein the cyclic prefix of the adjusted current OFDM signal and the end of the previous OFDM signal or the end of the adjusted previous OFDM signal are continuous.

Description

technical field [0001] Embodiments of the present invention relate to the field of wireless communication, and in particular, to a modulation method and a modulation device for OFDM signals. Background technique [0002] With the growth of users' demand for various real-time multimedia services and the rapid development of Internet technology, higher and higher requirements are put forward for the information transmission rate of wireless communication. In order to support higher information transmission rate and higher mobile speed of users, in the next generation wireless communication system, it is necessary to adopt wireless transmission technology with higher spectrum efficiency and stronger ability to resist multipath interference. [0003] Among the current wireless solutions for high-speed transmission, multi-carrier modulation technology represented by OFDM (Orthogonal Frequency Division Multiplexing) has become one of the most concerned technologies at present. Mu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2627
Inventor 姜勇王艺
Owner HUAWEI TECH CO LTD
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