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Low-signal-noise-ratio SC-FDE (Single Carrier-Frequency Domain Equalization) system synchronization method and synchronization device

A SC-FDE, low signal-to-noise ratio technology, applied in the field of communication, can solve problems such as poor synchronization performance, achieve good synchronization performance, solve timing point lag, and resist the effects of noise

Active Publication Date: 2015-10-28
SHENZHEN GENVICT TECH
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  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a low signal-to-noise ratio SC-FDE system synchronization method and synchronization device for the defects of poor synchronization performance of the traditional SC-FDE system synchronization algorithm under the low signal-to-noise ratio condition of the prior art , which enables precise synchronization of signals

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  • Low-signal-noise-ratio SC-FDE (Single Carrier-Frequency Domain Equalization) system synchronization method and synchronization device
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  • Low-signal-noise-ratio SC-FDE (Single Carrier-Frequency Domain Equalization) system synchronization method and synchronization device

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[0058] The invention relates to a low signal-to-noise ratio SC-FDE (Single Carrier Frequency Domain Equalization, single carrier frequency domain equalization) system synchronization algorithm in a wide-area Internet of Things M2M communication system, which is suitable for long-distance signal transmission and low efficiency requirements. Low SNR SC-FDE system.

[0059] figure 1 It is a structural schematic diagram of the data frame adopted in the low SNR SC-FDE system synchronization method of the present invention. Such as figure 1 As shown, in the present invention, the data frame used for the communication between the sending end and the receiving end of the low SNR SC-FDE system includes a training sequence, a cyclic prefix CP and a payload (ie, data symbols). Wherein, the training sequence includes a first training sequence A and a second training sequence B, and the first training sequence A is composed of a ZC sequence with a period length of L1 repeated T1 times, a...

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Abstract

The invention relates to a low-signal-noise-ratio SC-FDE (Single Carrier-Frequency Domain Equalization) system synchronization method and synchronization device. The synchronization method comprises the following steps that: a transmitting end transmits a data frame including a first training sequence A, a second training sequence B, a cyclic prefix (CP) and a data symbol; and a receiving end receives the data frame and executes the following steps: S1, detecting the data frame by using the first training sequence A with a parallel code phase search algorithm and acquiring a coarse frequency offset estimation value to correct a coarse frequency offset value in order to obtain a data symbol subjected to coarse frequency offset correction; S2, performing fine frequency offset estimation by using the second training sequence B to correct a fine frequency offset value in order to obtain a data symbol subjected to fine frequency offset correction; and S3, performing symbol timing estimation by using the second training sequence B. Through implementation of the low-signal-noise-ratio SC-FDE system synchronization method and synchronization device, the influence of noise can be resisted effectively; a large carrier frequency offset detection range can be realized; excessively large offsets are corrected; and high-accuracy synchronization of signals is finished.

Description

technical field [0001] The present invention relates to the communication field, and more specifically relates to a low signal-to-noise ratio SC-FDE system synchronization method and synchronization device. Background technique [0002] With the development of anti-fading technology and low-power receiving technology of wireless signals, the research of SC-FDE under the condition of low signal-to-noise ratio will become a hot spot in the future, especially "weightless" (a low-power wide-area Internet of Things technology Standard) has adopted SC-FDE technology as the main transmission scheme of the physical layer. Realizing M2M under the condition of low signal-to-noise ratio not only needs to strike a balance and compromise between signal-to-noise ratio and data throughput rate, but also requires anti-multipath transmission of signals within 15 kilometers. For M2M (Machine to Machine, machine-to-machine communication) digital communication systems with low signal-to-noise ...

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Application Information

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IPC IPC(8): H04L7/00
Inventor 董时富刘咏平吴嘉谊
Owner SHENZHEN GENVICT TECH
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