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Compensated peak-to-average ratio non-linear distortion new algorithm based on compression perception technology

A nonlinear distortion and compressed sensing technology, applied in multi-frequency code systems and other directions, can solve problems such as signal distortion, and achieve the effect of suppressing and compensating nonlinear distortion

Inactive Publication Date: 2017-03-15
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

Although the direct clipping method ensures that the HPA can work normally in the linear region, but at the same time a new problem arises, that is, the nonlinear process will cause signal distortion

Method used

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  • Compensated peak-to-average ratio non-linear distortion new algorithm based on compression perception technology
  • Compensated peak-to-average ratio non-linear distortion new algorithm based on compression perception technology
  • Compensated peak-to-average ratio non-linear distortion new algorithm based on compression perception technology

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specific Embodiment approach 1

[0074] Embodiment 1: A new algorithm for compensating peak-to-average ratio nonlinear distortion based on compressed sensing technology, the specific steps are as follows:

[0075] Step 1: Build a system model;

[0076] Step 1.1: Establish OFDM system model;

[0077] Use T to represent the unguarded interval period of OFDM symbols, and its carrier frequency interval is Δf=1 / T, if there are N subcarriers, then the frequency of the kth subcarrier is:

[0078] f k =f c +kΔf, k=0, 1, ..., N-1 (1)

[0079] Among them, f c is the carrier frequency;

[0080] In an OFDM symbol period T, X(k) is used to represent the complex information transmitted on the kth subcarrier, then the N-point IFFT of X(k) can be expressed by the following formula:

[0081]

[0082] J is N in OFDM system N The set of subcarrier sequence numbers of empty subcarriers

[0083] x(n) represents the time-domain data obtained after N-point IFFT

[0084] Equation (2) can also be expressed in the form of ...

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Abstract

A compensated peak-to-average ratio non-linear distortion new algorithm based on a compression perception technology belongs to the communication technology field. The algorithm comprises the following steps of (1) based on a CS theory, using an empty carrier wave to carry out peak-to-average ratio amplitude limiting compensation; and (2) carrying out OMP error tolerance value estimation based on an LS algorithm. The algorithm has advantages that (1) a receiver can accurately recover an amplitude of a signal before amplitude limiting; (2) generation of an amplitude limiting noise is greatly reduced, and simultaneously non-linear distortion of a linear amplifier is reduced so that system performance is effectively increased; and (3) algorithm complexity is low and an obvious improvement effect is possessed for an aspect of amplitude limiting noise reduction. The improved amplitude limiting algorithm based on compression perception is better than a common amplitude limiting algorithm, certain practicality is possessed and a certain reference value is possessed for a high-speed real-time OFDM underwater sound communication system.

Description

technical field [0001] The invention belongs to the field of underwater acoustic communication, and in particular relates to a new algorithm for compensating peak-to-average ratio nonlinear distortion based on compressed sensing technology. Background technique [0002] Under Water Acoustic (UWA) channels have serious multipath effects, which makes OFDM technology widely used in underwater acoustic communication systems. However, since the OFDM signal is superimposed by multiple subcarrier signals, when multiple subcarriers have the same phase, the peak value of the instantaneous power of the OFDM signal will be much greater than the average power value, resulting in a large peak-to-average power ratio ( PAPR) appears. This characteristic of the peak-to-average ratio of OFDM symbols will cause signal distortion and deteriorate the performance of the system, which will cause the system to use analog-to-digital (Analog to Digital, A / D), digital-to-analog (D / A) converters, Ha...

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Application Information

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IPC IPC(8): H04L27/26
Inventor 郭铁梁赵旦峰刘辉李社
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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