Symbol synchronization method based on particle filtering

A technology of particle filtering and symbol synchronization, which is applied in the direction of synchronization devices, digital transmission systems, electrical components, etc., can solve the problem of low estimation performance, achieve the effects of improving estimation accuracy, excellent estimation variance performance, and reducing the influence of self-noise

Inactive Publication Date: 2013-04-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] The purpose of the present invention is to improve the defect of low estimation performance of the existing time-domain symbol synchronization algorithm, propose a symbol synchronizat

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  • Symbol synchronization method based on particle filtering
  • Symbol synchronization method based on particle filtering
  • Symbol synchronization method based on particle filtering

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Embodiment 1

[0061] Taking the modulation and demodulation system adopting 16APSK modulation mode and matching filter roll-off coefficient as 0.2 as an example, the "a symbol synchronization method based on particle filter" of the present invention is used to realize symbol synchronization.

[0062] Such as figure 1 As shown, the input analog baseband signal x with a symbol rate of 1Mbaud I (t) and x Q (t) After AD sampling with a fixed sampling rate of 200MHz, it becomes a digital signal x I (nT s ) and x Q (nT s ), x I (nT s ) and x Q (nT s ) first passes through an interpolation filter based on the input signal and the timing offset estimate provided by the particle filter Calculate the value of the best sampling time, and the output of the interpolation filter is sent to the timing error calculation module to obtain u(r), and u(r) is particle-filtered to obtain the estimated value of the timing deviation then It is fed into the interpolation filter to control the interpol...

Embodiment 2

[0125] In order to further verify the synchronization method, the method in "a particle filter-based symbol synchronization method" described in the present invention is used to achieve synchronization for a system with frequency offset and phase offset. The system adopts the STM-4 standard, the information rate is 622.08Mbps, the 32APSK modulation method is adopted, the symbol rate is 154MB, each frame has 120 symbols at the beginning of the frame, 3936 symbols of effective data, and the roll-off coefficient is 0.5.

[0126] Step 1. Sampling the two input analog baseband signals with a symbol rate of 154MBaud, a modulation mode of 32APSK, and a roll-off coefficient of 0.5 to obtain a digital signal; wherein, the sampling rate is 1.54GHz.

[0127] Among them, the input baseband signal is two analog signals x I (t) and x Q (t), two signals x are obtained after analog-to-digital conversion I (nT s ) and x Q (nT s ).

[0128] Step 2. Generate particles.

[0129] According ...

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Abstract

The invention belongs to the technical field of communication signal processing and relates to a symbol synchronization method based on particle filtering, in particular to a high speed satellite communication system symbol synchronization method based on the particle filtering. An input analog baseband signal is turned into a digital signal after being subjected to analog digital (AD) sampling; the digital signal first passes through an interpolation filter; the interpolation filter calculates an optimal sampling instant value according to the input signal and a timing deviation estimated value which is provided by a particle filter; the output value of the interpolation filter is sent into a timing error calculation module to obtain a measured timing error; the measured timing error is subjected to the particle filtering to obtain the timing deviation estimated value, and then the timing deviation estimated value is sent into the interpolation filter to control an interpolation moment; and the output value x' (rTs) of the interpolation filter contains the optimal sampling instant value x' (rT) so that the symbol synchronization can be finished through direct output of the output value x' (rTs). By means of the symbol synchronization method based on the particle filtering, timing error estimated accuracy is improved on the premise that the sampling rate is not increased, the particle filtering is utilized for adjusting timing deviation, and compared with a traditional scheme, the influence of self noise is lowered.

Description

technical field [0001] The invention relates to a particle filter-based symbol synchronization method, in particular to a particle filter-based high-speed satellite communication system symbol synchronization method, which belongs to the technical field of communication signal processing. Background technique [0002] Synchronization has always been the research topic and technical bottleneck of high-speed satellite communication systems. Among them, the process of finding and tracking the best sampling time of symbol symbols is symbol synchronization. For high-speed satellite communication systems, due to the high symbol rate of modulation, limited by the AD device, the AD sampling rate should not be too high relative to the symbol rate, and it is necessary to be able to accurately restore the best signal at a lower sampling rate than the symbol rate. The value of the signal at the sampling instant. In May 1986, Gardner proposed a symbol synchronization algorithm, referred...

Claims

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Application Information

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IPC IPC(8): H04L7/00
CPCH04L7/0029
Inventor 刘策伦安建平田露卜祥元卢继华王正欢黄彦东柯晟
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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