Orthogonal frequency division multiplexing (OFDM) anti-interference synchronization method under complex multipath channel

A channel and complex technology, applied in the field of communication, can solve problems such as failure to work normally, and achieve the effect of improving anti-interference ability, reducing the influence of noise, and strong anti-interference ability

Inactive Publication Date: 2015-06-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] Aiming at the defect that the traditional OFDM synchronization method cannot work normally in a complex multipath environment with strong interference, the present invention pro

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  • Orthogonal frequency division multiplexing (OFDM) anti-interference synchronization method under complex multipath channel
  • Orthogonal frequency division multiplexing (OFDM) anti-interference synchronization method under complex multipath channel
  • Orthogonal frequency division multiplexing (OFDM) anti-interference synchronization method under complex multipath channel

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Embodiment Construction

[0032] The technical solution of the present invention will be described in detail below in combination with the embodiments and the accompanying drawings.

[0033] In this embodiment, a Matlab simulation platform is used for running experiments.

[0034] In the embodiment, the synchronization parameters are as follows: the ZC sequence length is 512, the channel sampling frequency is 10MHz, the channel model is a Rayleigh channel, its wireless channel is similar to the COST207 urban channel, there is no direct path in the channel, and the dispersive component delay power spectrum is an exponential decay type, the maximum delay is 7μs, and the diffuse Doppler power spectrum is a typical Jakes spectrum. The added noise in the channel is additive Gaussian white noise, and the added interference is partial frequency band interference of 20% frequency band.

[0035] Step 1: Synchronous sequence generation.

[0036] Generate ZC sequences C(k), c(k) and [x(k), x(k)] in the frequency ...

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Abstract

The invention relates to the field of communications, in particular to an orthogonal frequency division multiplexing (OFDM) anti-interference synchronization method under a complex multipath channel with strong interference signals. According to the method, an existing OFDM synchronization scheme is not suitable for a strong-interference complex multipath environment any more, and thus the OFDM anti-interference synchronization method under the complex multipath channel is designed. The method includes the specific steps that a sequence C(k), c(k) and [x(k) and x(k)] is generated; a sliding correlation value is solved; timing synchronization is conducted; frequency offset estimation is carried out. Compared with an existing synchronization method, by the adoption of the scheme, the OFDM symbol timing and frequency estimation accuracy under the complex multipath environment can be improved, and the anti-interference performance of the system is improved.

Description

technical field [0001] The invention relates to the field of communication, especially for complex multipath channels with strong interference signals. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology has the characteristics of high spectrum utilization rate and strong anti-fading ability, and has become the technical core of the new generation of mobile communication. Synchronization error is a main factor affecting the performance of OFDM system, especially the synchronization in complex multipath environment. Existing literatures have done a lot of research on OFDM synchronization technology, and classified OFDM from different angles. According to the synchronization function, it is divided into timing synchronization, carrier frequency synchronization and sampling clock synchronization; according to the scope and accuracy of synchronization, it is divided into coarse synchronization and fine synchronization; according to whether...

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2657H04L27/2663
Inventor 甘华强王军周鹏赵阳陈亚丁李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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