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Timing synchronization method based on SC-FDE burst signal double oversampling

A technology of SC-FDE and burst signal, applied in the direction of digital transmission system, electrical components, modulated carrier system, etc., can solve the problem of difficult residual timing deviation, limited sampling rate of broadband signal receiving hardware platform, limited bandwidth or hardware platform limit and other issues

Active Publication Date: 2020-10-30
BEIJING RES INST OF TELEMETRY +1
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Problems solved by technology

In the author's published invention patent "A Feedforward Timing Recovery Method Applicable to Satellite Communication Burst Transmission System, CN104135360, 2017", a timing synchronization method for satellite communication burst transmission system is designed, but it is only applicable to oversampling When the rate exceeds 4 times, it cannot be used for the case where the sampling rate of the broadband signal receiving hardware platform is limited
[0004] Various SC-FDE receiving technologies have been designed in the above-mentioned documents. It is difficult to solve the problem of residual timing deviation by using the traditional OFDM differential preamble method. There is a problem of limited bandwidth or hardware platform when using oversampled 4 times data for timing estimation, and accurate timing Phase synchronization is important for subsequent frequency domain equalization

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  • Timing synchronization method based on SC-FDE burst signal double oversampling
  • Timing synchronization method based on SC-FDE burst signal double oversampling
  • Timing synchronization method based on SC-FDE burst signal double oversampling

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Embodiment 1

[0100] The performance simulation results of the synchronization method of the present invention are compared with the theoretical performance limit of ranging.

[0101] figure 1 Shown is a block diagram of a timing synchronization method based on SC-FDE burst signal 2 times oversampling in the present invention. When using N u = UW sequence of length 64, N p =128 length preamble sequence, UW sequence is ZC sequence, preamble and data segment adopt QPSK modulation. After the signal is shaped, it is added to the channel, and after matching at the receiving end, it enters the timing of 2 times oversampling. The sampling delay deviation before timing often causes the signal sampling to deviate from the optimal point, and the optimal point is obtained by fitting after timing. figure 2 is the effect diagram of sampling and difference.

[0102] image 3 Shown is the mean value of the timing deviation estimation error, and the timing error is set to 0.125. It is obtained throu...

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Abstract

A timing synchronization method based on SC-FDE burst signal double oversampling comprises the following steps: (1) setting a time slot frame of a single carrier frequency domain equalization SC-FDE signal as s, and obtaining a kth oversampling digital signal x(kTS) of a receiving end; (2) performing timing deviation estimation based on 2NL+1 sampling signals x(kTS) corresponding to NL symbols fortiming; (3) calculating an interpolation base point ms and a relative timing deviation mus according to the timing deviation estimation value; and (4) carrying out linear interpolation to obtain an optimal sampling point z(m) of the received signal.

Description

technical field [0001] The invention relates to the technical field of digital wireless communication transmission, in particular to a timing synchronization method based on 2 times oversampling of SC-FDE burst signals. Background technique [0002] In wireless communication systems such as unmanned aerial vehicle data link and low-orbit satellite communication, broadband data transmission often faces a multipath environment. Orthogonal frequency division multiplexing OFDM technology or single carrier frequency domain equalization SC-FDE technology can be used to resist channel fading. Among them, compared with OFDM technology, SC-FDE technology has the advantage of lower peak-to-average ratio, can work close to the nonlinear saturation region of power amplifiers, and has higher power efficiency. The timing synchronization of SC-FDE technology can use the same traditional algorithm of OFDM system, and use the differential correlation of preamble segment or cyclic prefix CP t...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2655H04L27/2659H04L27/2678H04L27/2692Y02D30/70
Inventor 闫朝星刘同领罗翔付林罡王先朋李辉
Owner BEIJING RES INST OF TELEMETRY
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