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Method for receiving anti-time domain impulse interference signal of coded OFDM system

A time-domain pulse and receiving method technology, applied in the field of communication, can solve problems such as real signal distortion, and achieve the effect of low bit error rate

Active Publication Date: 2019-02-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the processing of the received waveform will distort the real signal, and Myriad filtering is suitable for short pulses

Method used

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  • Method for receiving anti-time domain impulse interference signal of coded OFDM system
  • Method for receiving anti-time domain impulse interference signal of coded OFDM system
  • Method for receiving anti-time domain impulse interference signal of coded OFDM system

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Embodiment

[0048] In this embodiment, the Matlab2014a simulation platform is used for running experiments. OFDM system parameters: subcarrier N=512, using 1 / 3 rate turbo coding, each code block includes 4096 source bits, 675 code blocks are randomly interleaved, and the waveform frame duration is 4.2012ms.

[0049] The wireless channel environment is a Doppler frequency shift of f d = 150Hz and maximum multipath delay τ max=3-path channel model of 5us, Rice factor (ratio of direct path to reflected path) is 20, channel bandwidth W=22.5MHz, baseband sampling frequency 22.5MHz, pulse JSR=10dB, pulse period is 25ms, duty cycle 1 / 8. The implementation steps are as follows, and step 1 can also be omitted in consideration of complexity.

[0050] Step 1: Extinguish the received signal in the time domain, divide the received signal into 10 segments, calculate the maximum amplitude of each segment, and take the smallest one to calculate p threshold , press p for each waveform frame threshol...

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Abstract

The invention belongs to the technical field of communication, and particularly relates to a method for receiving an anti-time domain impulse interference signal of a coded OFDM system. The method directly performs an IFFT / FFT operation and noise reduction processing by using the characteristic that a high frequency zero-subcarrier is no data signal, which is simpler than the formula as shown in the description for calculating a channel, wherein D is a matrix of N x L<t>, and D(i,:)=F(n,:), 1<=i<=N, the LS estimation of a pilot symbols is as shown in the description. The occurrence ofsingular matrices is avoided. Since there is time domain impulse interference in the channel, there will be interference in the entire frequency band of a frequency domain. At this time, the desiredperformance cannot be obtained only by error correcting codes, and the method of scaling interference portions can reduce the interference, but the soft demodulation performance is still not ideal. According to the method, the interference is treated as equivalent noise together with noise, and the average power of the equivalent noise is calculated to replace the noise variance in the soft demodulation, thereby improving the system performance.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an anti-time-domain pulse interference receiving method of a coded OFDM system. Background technique [0002] In recent years, people have higher and higher requirements for data traffic communication represented by the mobile Internet, and wireless communication technology is also developing in the direction of providing users with higher information transmission rates. In order to realize high-speed and highly reliable communication in a complex environment, the communication system needs to have the characteristics of high spectrum utilization and better anti-multipath ability. Just because of these characteristics, Orthogonal Frequency Division Multiplexing (OFDM) technology has become the solution of many wireless communication systems. In the current commercial 4G mobile communication solution, OFDM has become one of the key technologies in the physical l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/26H04L1/00
CPCH04L1/0054H04L1/0071H04L25/03012H04L27/265H04L2025/03611
Inventor 刘松淘王军黄巍李雪迎
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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