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Satellite mobile OFDM communication system channel estimation method and device

A communication system and channel estimation technology, which is applied in the field of satellite mobile communication, can solve problems such as frequency deviation, large time delay, phase deflection of received data, and influence on the demodulation performance of the receiving system, and achieve the goal of simple algorithm structure and simplified calculation process Effect

Active Publication Date: 2021-12-21
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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AI Technical Summary

Problems solved by technology

[0002] In the satellite mobile communication system, OFDM technology is gradually applied to it. Due to the block of satellite movement speed, the frequency offset and time delay are relatively large, which will cause the phase of the received data to be deflected and affect the demodulation performance of the receiving system.

Method used

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  • Satellite mobile OFDM communication system channel estimation method and device
  • Satellite mobile OFDM communication system channel estimation method and device
  • Satellite mobile OFDM communication system channel estimation method and device

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Embodiment Construction

[0053] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0054] In the OFDM system, a subframe includes two slots (slots), and each slot has 14 symbols, of which the 0th and 7th are pilot symbols, and the others are data symbols. The slot structure is as follows image 3 shown. The CP length of the pilot symbol is configured by higher layers, and the maximum is 160.

[0055] The present invention is applied to the receiving end of the ground base station, and can also be used for the receiving end of the terminal, such as figure 1 Shown is a functional block diagram of an embodiment of the present invention, figure 2 It is a flowchart of an embodimen...

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Abstract

The invention discloses a satellite mobile OFDM communication system channel estimation method and device, and relates to a satellite mobile communication system gateway station and a terminal design technology. Aiming at the characteristic that an OFDM system is greatly influenced by frequency offset and time offset, estimation compensation of a received signal is realized and demodulation of the signal is completed by using pilot symbols and methods of phase rotation estimation, timing offset estimation, frequency offset compensation and the like. The method has the advantages of being simple, high in processing speed, rapid in tracking frequency change and the like, and is particularly suitable for demodulation of a satellite mobile OFDM communication system.

Description

technical field [0001] The invention belongs to the field of satellite mobile communication, and relates to a channel estimation method and device of a satellite mobile OFDM communication system. It is especially suitable for the demodulation of OFDM signals by gateway stations and terminals of satellite mobile communication systems. Background technique [0002] In the satellite mobile communication system, OFDM technology is gradually applied to it. Due to the block of satellite movement speed, the frequency deviation and time delay are large, which will cause the phase of the received data to be deflected and affect the demodulation performance of the receiving system. In order to ensure the performance of the base station receiving system, it is necessary to correct and compensate the frequency offset and phase rotation generated by the data. Due to the high transmission rate of the OFDM system and the fast phase change, a method is needed to track the phase change of th...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/02H04B7/185
CPCH04L27/2695H04L25/0224H04B7/18513
Inventor 王力男陈金伦王永超王雨晴
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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