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Method of reducing nonlinear distortion of multi-carrier signal in LTE system

A nonlinear distortion, multi-carrier signal technology, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve the problems of system performance degradation, the impact of received signal bit error rate, large out-of-band spectrum, etc. Anti-interference and accuracy, eliminate nonlinear distortion, improve the effectiveness of multi-carrier transmission signals

Active Publication Date: 2018-03-06
CHANGAN UNIV
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Problems solved by technology

However, the shortcomings of their methods are: both methods will affect the bit error rate of the received signal, and suppressing the peak-to-average ratio of the signal will cause a large out-of-band spectrum leakage, which will cause a sharp decline in system performance

Method used

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  • Method of reducing nonlinear distortion of multi-carrier signal in LTE system
  • Method of reducing nonlinear distortion of multi-carrier signal in LTE system
  • Method of reducing nonlinear distortion of multi-carrier signal in LTE system

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Embodiment Construction

[0054] First, constellation mapping and modulation are performed on the original transmitted signal to obtain a multi-carrier time-domain transmission signal. By comparing the multi-carrier time-domain transmission signal through the power amplifier, the introduced noise component is obtained, and the noise component that satisfies the conditions is selected and mapped to the carrier injection. Gather, and then obtain the subtracted signal in the carrier injection set, and combine it with the multi-carrier time-domain transmission signal to obtain a new transmission signal, and finally send the new transmission signal that meets the distortion limit condition after digital-to-analog conversion and radio frequency amplification.

[0055] Refer to attached figure 1 , the specific implementation steps of the present invention are as follows:

[0056] (1) Initialization: set the nonlinear distortion threshold ξ and the maximum number of iterations T;

[0057] (2) The original tra...

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Abstract

The invention relates to a method for reducing the nonlinear distortion of multi-carrier signals in an LTE system. Firstly, constellation mapping and modulation are performed on the original transmission signal to obtain a multi-carrier time-domain transmission signal. By comparing the changes of the multi-carrier time-domain transmission signal through a power amplifier, the obtained The introduced noise component, and select the noise component to form the carrier injection set, and then obtain the subtracted signal in the carrier injection set, and combine it with the multi-carrier time domain transmission signal to obtain a new transmission signal, and finally send the new transmission signal that meets the distortion limit condition go out. The present invention can eliminate the nonlinear distortion introduced by the signal through the power amplifier to the greatest extent with relatively low complexity, thereby effectively improving the anti-interference and accuracy of signal transmission without reducing the bit error rate and transmission efficiency of the transmission system.

Description

【Technical field】 [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method for reducing nonlinear distortion of multi-carrier signals in an LTE system. 【Background technique】 [0002] The multi-carrier technology represented by OFDM (orthogonal frequency division multiplexing, OFDM) has become one of the key technologies in the physical layer of wireless communication systems such as B3G / 4G due to its high-frequency band utilization and low implementation complexity. At present, multi-carrier modulation technology has been widely used in Asymmetric Digital Subscriber Line (ADSL), High Definition Television (High Definition Television, HDTV) and 3GPP-LTE (The 3rd Generation Partnership Project Long Term Evolution, 3GPP- LTE) and other standards. [0003] However, there are still some technical difficulties in the process of multi-carrier transmission that need to be solved urgently. One of them is the nonlinear dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2691
Inventor 赵祥模张阳侯俊惠飞马峻岩史昕杨澜时恒心胡梦岩
Owner CHANGAN UNIV
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