Novel power back-off amount metric system and method based on out-of-band cubic metric (OCM)

A technology of power back-off and cubic measurement, applied in power management, multi-frequency code system, electrical components, etc., can solve problems such as in-band distortion, inaccurate CM algorithm, and inability to accurately represent OBR

Inactive Publication Date: 2014-06-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0014] ① OBR is caused by third-order nonlinearity, and the PAPR algorithm only considers the peak power, which cannot accurately represent OBR;
[0015] ② The third-order nonlinearity not only causes OBR, but also causes in-ban

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  • Novel power back-off amount metric system and method based on out-of-band cubic metric (OCM)
  • Novel power back-off amount metric system and method based on out-of-band cubic metric (OCM)
  • Novel power back-off amount metric system and method based on out-of-band cubic metric (OCM)

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[0064] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0065] Through the analysis of the background technology section, the out-of-band part of the third-order nonlinear output power is more closely related to the out-of-band distortion of the output signal of the power amplifier PA. Therefore, if the out-of-band radiation of the third-order output is directly used to predict the out-of-band radiation, it will be more accurate. This new metric is called out-of-band CM (OCM).

[0066] like figure 1 As shown, the new power back-off measurement system based on the out-of-band cubic metric OCM includes a serial / parallel conversion module, an IFFT conversion module, a parallel / serial conversion module, a signal OCM metric value calculation module and a power back-off calculation module, The input ...

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Abstract

The invention discloses a novel power back-off amount metric system and method based on out-of-band cubic metric (OCM). The system comprises a serial/parallel conversion module, an IFFT conversion module, a parallel/serial conversion module, a signal OCM calculation module and a power back-off amount calculation module. The serial/parallel conversion module is connected with the input end of the IFFT conversion module, one output end of the IFFT conversion module is connected with a power amplifier sequentially through the signal OCM calculation module and the power back-off amount calculation module. The method includes the steps that the average power value Pav of an original OFDM signal is calculated; the out-of-band radiation average power value POB of the OFDM signal is calculated; the OCM is calculated; the power back-off (PBO) amount is calculated. The power back-off amount is predicated by the adoption of the out-of-band radiation average power of the OFDM signal and the average power of an original signal, an out-of-band part of third-order output is directly used for predicating out-of-band radiation, and compared with a traditional PAPR method and a traditional CM method, the power back-off amount needed by the power amplifier (PA) can be predicated more accurately.

Description

technical field [0001] The invention relates to the field of power backoff measurement, in particular to a novel power backoff measurement system and method based on out-of-band cubic metric OCM. Background technique [0002] OFDM technology is a multi-carrier digital modulation technology. OFDM signals are superimposed by multiple independent sub-carrier signals. Therefore, when the number of sub-carriers increases to a relatively large number, the OFDM time-domain signal will approximate a complex Gaussian random process, so the fluctuation of its signal envelope is much larger than that of a single-carrier system. The large fluctuation of the signal envelope requires a large linear range of the power amplifier (PA), otherwise, the signal enters the nonlinear region, which will cause serious out-of-band radiation (OBR), resulting in phase adjacent channel interference. However, due to the nonlinear characteristics of the PA, the power amplifier is required to have a larg...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04W52/34
Inventor 朱晓东张翔引胡海超夏金祥胡明
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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