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A Impulse Noise Suppression Method in OFDM Communication System

A technology of impulse noise and communication systems, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve the problems of impulse noise interference, long burst length, high power, etc., and achieve improved anti-impulse noise performance, small The effect of interweaving depth

Active Publication Date: 2021-07-13
深圳市力合微电子股份有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of pulse noise interference in the prior art, especially the problem of high power and long burst length pulse noise interference, and propose a method for suppressing pulse noise in an OFDM communication system

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  • A Impulse Noise Suppression Method in OFDM Communication System
  • A Impulse Noise Suppression Method in OFDM Communication System
  • A Impulse Noise Suppression Method in OFDM Communication System

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] figure 1 Shown is a schematic diagram of an STBC (Space Time Block Code, space-time block coding) encoder. The figure shows the application of dual transmitting antennas, which is the widely used Alamouti scheme, which has the characteristics of full rate, full diversity and simple linear decoding algorithm. The input data symbols are divided into odd branches and even branches through serial-to-parallel conversion 101 . The two branches are recombined in the time domain and space domain at the signal recombination 102 to obtain the data symbol sequences of the two antennas. Odd / even branches are directly multiplexed to obtain the symbol sequence s of antenna 1 * 1,s2,s * 3,s4,s * 5, s6,.... Invert the conjugate of the even-numbered branch, and then multiplex with the conjugate of the odd-numbered branch to obtain the symbol sequence-s of a...

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Abstract

The present invention provides a method for suppressing impulse noise in an OFDM communication system, comprising: S1: performing embedded interleaved space-time block coding on transmitted data symbols to obtain two transmission symbols; S2: performing IFFT transformation on the two transmission symbols respectively to the time domain, and insert the guard interval signal; S3: respectively up-convert the two time domain signals obtained in S2, and transmit them; S4: receive the signal transmitted in S3, obtain the received signal, and Down-converting the received signal; S5: limiting the down-converted signal; S6: stripping the guard interval from the limited signal, and performing FFT transformation to the frequency domain to obtain a frequency-domain signal. The symbol interleaving method embedded in space-time block coding (STBC) realizes the breaking up of impulse noise interference with a small interleaving depth; combined with the impulse noise suppression of time-domain clipping and the diversity reception function of STBC decoding, it aims at the scattered Impulse noise interference is effectively suppressed and the anti-impulse noise performance is improved.

Description

technical field [0001] The invention belongs to the technical field of digital communication, in particular to an impulse noise suppression method in an OFDM communication system. Background technique [0002] Impulse noise is a kind of interference that is difficult to deal with in communication systems, and it is one of the main factors leading to the failure of communication links. Impulse noise mainly comes from factors such as rectifier circuits, electrical switches, lightning, and automobile spark plug ignition devices. Impulse noise has the characteristics of short duration, much higher power than background noise, and random occurrence. The wireless communication system is mainly affected by the impulse noise in the low-end part of the VHF frequency band and the UHF frequency band, and the average duration (burst length) of the impulse noise is less than 250us, and the occurrence interval is greater than tens of ms. In the power line carrier communication system, t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L1/06H04L1/00
CPCH04L1/0071H04L1/0625H04L1/0631H04L27/2628H04L27/265
Inventor 刘鲲刘元成龙必起陈丽恒
Owner 深圳市力合微电子股份有限公司
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