Synchronous device and method in narrowband wireless communication terminal

A wireless communication system and terminal technology, applied in the directions of synchronization devices, synchronization receivers, digital transmission systems, etc., can solve the problems of short synchronization sequences and inability to find correlation peaks, and achieve the effect of improving performance, excellent performance, and improving overall performance.

Active Publication Date: 2017-05-10
浙江芯科物联科技股份有限公司
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Problems solved by technology

For narrowband wireless communication systems, since the synchronization sequence is short and works in an environment with extremely low signal-to-noise ratio and large initial frequency of

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  • Synchronous device and method in narrowband wireless communication terminal
  • Synchronous device and method in narrowband wireless communication terminal
  • Synchronous device and method in narrowband wireless communication terminal

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Embodiment Construction

[0049] The implementation of the present invention will be described below through specific examples. The specific examples described here are only used to explain the present invention, but are not intended to limit the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0050] Please refer to the accompanying drawings, the modules contained in the NPSS detection device are as follows figure 1 As shown, it includes downsampling module, sliding autocorrelation module (AutoCorr), coarse cross-correlation module and fine cross-correlation module.

[0051] M101 Downsampling Module

[0052] The downsampling module realizes downsampling from a sampling rate of 1.92MHz to 240K. Before downsampling, each subframe inputs 1920=(137*14+2) sampling points of 1ms, and after downsampling, each subframe outputs 238=(17* 14) sampling points, and follow the fixed downsamp...

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Abstract

The invention discloses a synchronous detection device applied to a narrowband wireless communication system terminal. The device comprises a down-sampling module, a sliding autocorrelation module and a difference cross-correlation module. A received 1.92 MHz time-domain signal is subjected to down sampling to a 240 kHz signal through the down-sampling module in terms of OFDM symbol time periods and a fixed down-sampling pattern. Through the sliding autocorrelation module, sampling point data in a 10 ms wireless frame processing window is moved bit by bit as an initial position t, date of which the length is eleven OFDM symbol time periods is taken as a sliding window, and the eleven groups of sample points in the sliding window are correlatively accumulated at intervals of two groups. Through the difference cross-correlation module, an obtained primary synchronizing sequence is subjected to differencing to form two approximately equal parts and is correlatively accumulated with a main synchronizing sequence generated locally. According to the invention, by employing the synchronous detection device, main synchronizing signals are detected well in the narrowband-wireless-communication-system application scenario in which the signal-to-noise ratio is low and the frequency deviation is large, and the implementation complexity is low so that the low-cost requirement of the narrowband wireless communication terminal is met.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to a synchronization device and method applied to narrowband cellular communication terminals in a future Internet of Things network. Background technique [0002] In the recent communication market, IoT (Internet of Things) has become a bright spot in the industry, and many operators and devices have demonstrated their latest innovations and application cases. Among them, narrowband wireless communication technology (NB-Iot) is the key for operators to enter the Internet of Things market. The narrowband wireless communication system has the advantages of low power consumption, wide coverage, low cost, and large capacity, so it can be widely used in a variety of vertical industries, such as remote meter reading, asset tracking, smart parking, smart agriculture, etc. The first version of the 3GPP standard is expected to be released in June 2016. It is expected that narrow...

Claims

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Application Information

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IPC IPC(8): H04L7/00H04L27/26H04L27/00
CPCH04L7/0079H04L27/2668H04L27/0014H04L2027/0026
Inventor 李文龙
Owner 浙江芯科物联科技股份有限公司
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