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Wireless communication method

A leading and main technology, applied in wireless communication, phase-modulated carrier system, electrical components, etc., can solve problems such as increased collision probability, affecting network capacity, and channel boundaries cannot be accurately defined

Active Publication Date: 2016-04-06
SEMTECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in such cases, the random frequency drift of the local oscillator changes frequency so that channel boundaries cannot be precisely defined, collision probability increases and negatively affects network capacity

Method used

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Embodiment Construction

[0021] The following description of the best mode presently conceived for carrying out the invention is not to be taken in a limiting sense, but is made for the purpose of describing the general principles of the invention only. The scope of the present invention should be determined with reference to the claims.

[0022] Reference will now be made to the drawings, wherein like numerals refer to like parts throughout.

[0023] For a detailed description of the LoRa modulation scheme, the reader is directed to European Patent Applications EP2449690 and EP2763321 (incorporated herein by reference). For brevity, this specification will briefly review the main points.

[0024] LoRa modulation is based on a sequence of frequency chirps whose frequency changes from an initial instantaneous frequency value along a predetermined time interval to change to the final instantaneous frequency . To simplify the description, it will be assumed that all chirps have the same duration ...

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Abstract

A wireless communication method between a plurality of end-points by a plurality of base stations, based on frames that have a chirp spread spectrum,CSS,-modulated preamble followed by a data body modulated at a narrower bandwidth, either by CSS or by an ultra-narrowband, UNB modulation. The system facilitates avoidance or mitigation of collision between packets and allows increase in network capacity, while maintaining the simplicity of detection inherent to CSS modulation.

Description

technical field [0001] The present invention is directed to methods and frames for controlling multiple endpoints by multiple base stations in a wireless network, particularly but not exclusively when the throughput of the network system is the limiting factor and the network employs a composite chirp modulation scheme . Background technique [0002] Digital wireless data transmission is used in a variety of systems that exhibit great variability in data rate, transmission range, and power consumption. The various Bluetooth® protocols are examples of techniques that use spectral modulation techniques to improve immunity to noise and interference in radio communications. These modulation schemes use frequency hopping spread spectrum and achieve low consumption and good bandwidth, but their range is limited to a few meters. [0003] Direct sequence spread spectrum techniques are also known and can achieve very high levels of coding gain. In some cases, like in GPS systems, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/69
CPCH04B1/69H04B1/692H04B1/713H04B2001/6912H04L27/22H04W72/0446
Inventor O.B.A.塞勒
Owner SEMTECH CORP
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