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A signal transmission method and narrowband wireless terminal

A technology for signal transmission and wireless communication terminals, applied in the field of narrowband wireless receivers, can solve problems such as the inability to receive signals correctly, achieve the effects of saving hardware costs, meeting low costs, and ensuring accuracy

Active Publication Date: 2020-03-06
深圳市励科机电科技工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] For the deficiencies of the existing technology, the inventor believes that it is necessary to design a signal transmission scheme for narrowband wireless communication from both the base station (transmitter) and the terminal (receiver) to overcome the extremely low signal-to-noise ratio (SNR=- 20dB) and a large frequency offset (maximum frequency offset 25kHz) deployment scenario, the problem that the signal cannot be received correctly

Method used

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  • A signal transmission method and narrowband wireless terminal
  • A signal transmission method and narrowband wireless terminal
  • A signal transmission method and narrowband wireless terminal

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Experimental program
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Embodiment 1

[0035] As described in the background, a narrowband wireless communication system includes two types of carriers: anchor carriers and non-anchor carriers. Both the subframes carrying synchronization signals (NPSS / NSSS) and the subframes carrying broadcast signals (MIB / SIB1) are mapped on the fixed subframes of the anchor carrier. The subframe carrying service data can be mapped on the anchor carrier or non-anchor carrier. The subframe sequence number is configured by the base station side. The protocol stipulates that the base station uses BitMap (1 means valid DL subframe, 0 means invalid DL subframe) subframe) to indicate the downlink subframes that the terminal can use in a radio frame, for example figure 1 The service data shown in a is carried on the subframes #0, #1, #2, #3 and #8, #9 of each wireless frame, and its BITMAP=1111000011, figure 1 The subframe configuration BITMAP=1010101011 shown in b, figure 1 The continuously usable downlink subframes in a configuration...

Embodiment 2

[0084] Please refer to image 3 , is a structural schematic diagram of a narrowband wireless communication terminal disclosed in the present invention, including the following modules.

[0085] M101, data receiving module

[0086] The module receives configuration information from the base station, including the number of available downlink subframes, the number N of subframes to be sent repeatedly, and the configuration of NRS antenna ports. And receiving the signal of the NPSS / NSSS / NPBCH subframe on the anchor carrier, carrying the signal of the usable downlink subframe on the service data carrier.

[0087] M201, LS Estimation Module

[0088] This module implements LS channel estimation for NPSS / NSSS / NPBCH subframes and LS channel estimation for downlink subframes carrying service data.

[0089] The processing of the NPSS / NSSS / NPBCH subframe includes generating the NPSS / NSSS / NPBCH signal sequence locally, and multiplying the received NPSS / NSSS / NPBCH subframe signal conjug...

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Abstract

The invention discloses a technology for realizing signal transmission in a narrowband wireless communication system. Firstly, a base station repeatedly places business data on N continuous and available downlink subframes and informs to a terminal, and the terminal receives NPSS / NSSS / NPBCH subframes on an anchor carrier and carries out frequency offset estimation accordingly. After the terminal receives the downlink subframes, the terminal carries out frequency offset correction on receiving data according to an estimated frequency offset value, and lastly, the terminal merges the subframe data after frequency offset correction and a channel estimation result thereof and carries out MIMO detection at a time. The invention aims at improving the noise reduction capability in the narrowband wireless communication while reducing the implementation complexity of the terminal.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to a baseband signal transmission method in a narrowband wireless IoT network and a narrowband wireless receiver. 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. Narrowband wireless communication systems need to have the advantages of low cost, low power consumption, wide coverage, and a large number of nodes. For example, it is generally believed that the cost of its terminal nodes is less than one dollar, and the battery can support a standby state of more than one year, and the coverage is greater than tens of kilometers, and the number of nodes can reach billi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00H04W72/04H04B7/0413
CPCH04B7/0413H04L5/0037H04L5/0094H04W72/0446
Inventor 李文龙
Owner 深圳市励科机电科技工程有限公司