Method and device for improving ACLR index

An indicator and chip technology, applied in the field of improving multi-carrier ACLR indicators in TD-SCDMA systems, can solve problems such as deteriorating ACLR indicators, deteriorating peak-to-average ratio of baseband data, deteriorating algorithm performance, etc., to eliminate carrier errors, improve ACLR indicators, Unlimited effect of digital interpolation multiples

Active Publication Date: 2009-10-28
DATANG MOBILE COMM EQUIP CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

[0008] Among them, when the digital interpolation multiple (integer) cannot be divisible by the required NCO frequency, the NCO frequency control word is not an integer, and needs to be rounded, and the part that is not divisible will be discarded; and the carrier step defined according to the standard is 200Hz, so the required NCO frequency is an integer multiple of 200Hz. This frequency is controlled by the frequency control word. When the frequency control word is rounded, a very small frequency error will be generated, causing the corresponding carrier wave to not be divisible by 200Hz. In this way It will lead to using a time period of 5ms (that is, the observation frequency is 200Hz) to observe the carrier signal. The initial phase of the carrier signal observed every 5ms is different. The initial phase of the carrier signal of 5ms is the same; therefore, when the initial phase of the NCO of multiple carriers in each subframe in continuous multi-subframe data is not d

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  • Method and device for improving ACLR index
  • Method and device for improving ACLR index
  • Method and device for improving ACLR index

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Embodiment Construction

[0041] The basic idea of ​​the present invention is to re-synchronize the initial phases in the digital frequency conversion channels of each carrier to the same phase by resetting the initial phases of the NCOs of all carriers, thereby eliminating the carrier wave caused by the indivisibility of the NCO control word The error solves the problem that the data peak-to-average ratio fluctuates in each subframe, and then achieves the purpose of improving the ACLR index.

[0042] In order to enable those skilled in the art to better understand the present invention, the method of the present invention will be described in detail below in conjunction with the drawings and specific embodiments.

[0043] Embodiment 1 of the present invention proposes a method for improving the ACLR index, such as image 3 As shown, the method includes:

[0044] Step 301: preset the NCO initial phase in the digital frequency conversion chip;

[0045] Among them, the setting of the initial phase is m...

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Abstract

The invention provides a method for improving an ACLR index, comprising the following steps: presetting a primary phase of a digital intermediate-frequency oscillator (NCO) in a digital frequency conversion chip; and synchronizing the NCO of each carrier wave digital frequency conversion channel again to form same phase. The invention also provides a device for improving an ACLR index. By adopting the method and the device, the invention eliminates the carrier wave error brought by aliquant control words of the NCO, solves the problem that the peak-to-average power ratio of baseband data fluctuates in each subframe, thereby further achieving the aim of improving the ACLR index; in addition, the invention can sufficiently exert the performance of a digital intermediate-frequency chip so that the digital interpolating times are not limited.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a method and a device for improving multi-carrier ACLR indicators in a TD-SCDMA system. Background technique [0002] In the existing TD-SCDMA (Time Division Synchronous CDMA, Time Division-Synchronous Code Division Multiple Access) system, ACLR (Adjacent Channel Leakage Ratio, adjacent channel leakage power ratio) is an important indicator in the radio frequency indicators of the base station. The indicator indicates the ratio of the transmit power of the working signal channel to the radiated power of the adjacent channel; among them, the most critical factor affecting ACLR is the linearity of the power amplifier and the peak-to-average ratio of the data, that is, increasing the rated power of the power amplifier and reducing the baseband The peak-to-average ratio of the data can improve the ACLR index. [0003] Among them, reducing the peak-to-average ratio of ba...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 郭全成高军
Owner DATANG MOBILE COMM EQUIP CO LTD
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