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High-dynamic frequency offset estimation method based on joint iterative decoding

A technology of frequency offset estimation and joint iteration, applied in the field of satellite communication reception, can solve problems such as large complexity, large estimation range, and low estimation accuracy, and achieve the effect of reducing complexity, simplifying construction and analysis

Active Publication Date: 2020-06-12
SUN YAT SEN UNIV
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Problems solved by technology

Common data-assisted synchronization methods include pilot-assisted algorithms such as Kay algorithm, Fitz algorithm, L&R algorithm, and M&M algorithm. These algorithms have different computational complexity and applicable application scenarios, and are characterized by large estimation range and low estimation accuracy.
The estimation range of code-assisted synchronization technology is smaller than that of data-assisted synchronization technology, but the estimation accuracy is higher and the complexity is larger, and the current existing algorithm is for the estimation of constant frequency offset

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  • High-dynamic frequency offset estimation method based on joint iterative decoding
  • High-dynamic frequency offset estimation method based on joint iterative decoding
  • High-dynamic frequency offset estimation method based on joint iterative decoding

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Embodiment

[0061] This embodiment combines the attached figure 1 to attach Figure 4 And a specific receiver system is used to give a detailed description of the joint iterative decoding high dynamic frequency offset estimation method proposed by the present invention.

[0062] Consider the system model as follows: the transmitted signal is modulated by QPSK, and the code rate is 1 / 3 turbo channel coding. The length of the sent symbol is K=45×10 4 , the symbol period is T s =20us, the channel signal-to-noise ratio is -3.5dB, the first-order frequency deviation is 300Hz, and the second-order frequency deviation is 10Hz / s.

[0063] After the transmitted signal passes through the analog channel, the receiver performs frame synchronization and symbol synchronization to obtain the symbol information, and then uses the pilot rough estimation method to estimate the initial frequency offset value and perform signal frequency offset compensation to obtain r (0) ; get y through soft demodulati...

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Abstract

The invention discloses a high-dynamic frequency offset estimation method based on joint iterative decoding, which fully utilizes a channel coding structure, utilizes a decoder to output soft information to perform frequency offset estimation, and compensates a frequency offset value obtained by frequency offset estimation calculation for a received signal. According to the method, an estimation expression containing a high-order frequency offset variable is established based on the maximum likelihood criterion, and the high-order frequency offset variable is simplified through an enumerationmethod. Obtaining a first-order frequency offset estimation value of the simplified expression by using discrete Fourier transform (DFT), and obtaining a second-order frequency offset estimation valueof the simplified expression by using a second-order frequency offset estimation value of the simplified expression; and under different listed high-order frequency offset estimation variables, comparing the maximum values of the estimation expressions obtained by the DFT to obtain a target frequency offset estimation value. The method can be used for frequency offset estimation under the condition that the channel environment is severe, and a frequency offset estimation value with high precision can be obtained.

Description

technical field [0001] The invention relates to the technical field of satellite communication reception, in particular to a high dynamic frequency offset estimation method based on joint iterative decoding. Background technique [0002] As an extension of the ground communication network, satellite communication can achieve communication coverage in places that are difficult to reach by the ground communication network. However, the special environment of the satellite communication channel makes it difficult to apply the commonly used ground receiving technology to the satellite communication receiver. Generally, the satellite is in a high-speed moving state, and there is a large Doppler frequency deviation in the communication channel, and because the satellite does not move at a uniform speed, the Doppler frequency deviation is often a high-order variable. [0003] Common receiving synchronization technologies include data-assisted synchronization technology, non-data-as...

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2657
Inventor 陈翔黄泽润邱继云龚杰
Owner SUN YAT SEN UNIV
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