A Multi-Carrier Nonlinear Clipping Distortion Compressed Sensing Estimation Method to Mitigate Observation Interference

A compressed sensing and clipping distortion technology, applied in modulation carrier systems, multi-frequency code systems, digital transmission systems, etc., can solve the problems affecting the reconstruction performance of the compressed sensing algorithm, clipping distortion, etc., and achieve effective and reliable data processing capacity , Improve the measurement signal-to-noise ratio and overcome the effect of large interference noise

Active Publication Date: 2020-03-13
QINGDAO UNIV
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Problems solved by technology

[0010] 2. Clipping distortion
[0042] Therefore, the measured signal-to-noise ratio MSNR in different sub-channels is different, and MSNR significantly affects the reconstruction performance of the compressive sensing algorithm for c

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  • A Multi-Carrier Nonlinear Clipping Distortion Compressed Sensing Estimation Method to Mitigate Observation Interference
  • A Multi-Carrier Nonlinear Clipping Distortion Compressed Sensing Estimation Method to Mitigate Observation Interference
  • A Multi-Carrier Nonlinear Clipping Distortion Compressed Sensing Estimation Method to Mitigate Observation Interference

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[0109] Figure 8 An overall block diagram of an OFDM receiver including a clipping distortion suppression module according to an embodiment of the present invention. Channel estimation and sub-channel demapping are the basic steps of traditional OFDM receivers, which are not included in the inventions of this patent application. image 3 It is a specific implementation block diagram of the OFDM clipping distortion compressed sensing reconstruction and suppression scheme proposed by the present invention to alleviate observation interference. The present invention will be described in detail below with reference to other drawings and in combination with embodiments. The parameters of designing OFDM system are shown in Table 1.

[0110] Table 1

[0111] project parameter Sampling rate(GHz) 1 IFFT / FFT length 2048 Subcarrier spacing (MHz) 0.488 Number of subcarriers N 512 Modulation 16-QAM Clipping rate(dB) 1.5 / 2 / 2.5 Measurin...

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Abstract

A multicarrier non-linear clipping distortion compressed sensing estimation method of relieving the observation interference, provided by the present invention, comprises the following steps of S1 before the target information is measured, pre-configuring a channel observation interference inhibition module; S2 before the target information is measured, using the channel observation interference inhibition module to pre-estimate an observation interference component, denoising a reception end original frequency domain symbol, and constructing an alternative observation vector; S3 during a target information measurement process, generating a corresponding row step measurement matrix according to the observation interference component estimation information, a measurement compression ratio and a measurement criterion, and acquiring data in a plurality of sub-channels as the final observation vector information. The method of the present invention still shows a strong communication performance on the conditions of the low measurement compression ratio and the depth clipping, and enables the system robustness to be improved.

Description

technical field [0001] The invention relates to the technical field of digital communication systems, in particular to a method for estimating multi-carrier nonlinear clipping distortion compressed sensing for alleviating observation interference. Background technique [0002] 1. Multi-carrier modulation technology [0003] Multi-carrier modulation uses multiple carrier signals to divide data into several sub-data streams, which reduces the sensitivity of the system to the time dispersion of the transmission channel. It has the advantages of high spectrum utilization and strong anti-multipath interference ability, and is widely used in In wireless communication and wired communication system. However, the multi-carrier modulation signal has a high peak-to-average power ratio (PAPR), and the large peak signal will cause signal distortion through the nonlinear device (such as power amplifier, HPA) in the system, and the nonlinear noise generated seriously affects the system. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2623H04L27/2691H04L27/2695
Inventor 苗圃朱秉诚吴乐南宋康戚晨皓
Owner QINGDAO UNIV
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