A multi-antenna Internet of things information transmission method
An information transmission and Internet of Things technology, applied in radio transmission systems, transmission systems, digital transmission systems, etc., can solve the problems of transmission reliability, affecting LoRa applications, prone to bit errors, etc., to improve communication quality and reliability. Sex, the effect of resisting Rayleigh fading
Active Publication Date: 2020-09-29
SHENZHEN UNIV
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Problems solved by technology
Although the CSS spread spectrum modulation method used by LoRa can resist interference to a certain extent, the reliability of transmission is greatly affected after passing through the Rayleigh channel.
This makes LoRa prone to bit errors when transmitting on wireless channels, thus affecting the application of LoRa in the market
Method used
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[0036] specific implementation
[0037] like figure 1 As shown, this specific example is a multi-antenna Internet of Things information transmission method, using more than two antennas at the sending end and the receiving end, and the transmission steps include:
[0038] A. Perform spread-spectrum processing on the desired LORA signal x to obtain the spread-spectrum signal Spread, and multiply the spread-spectrum signal Spread and the upchirp signal to obtain the signal Tx to be transmitted;
[0039] B. Carrying out space-time block coding on the obtained transmission signal Tx packet;
[0040] C. Add additive Gaussian white noise to the encoded signal and transmit it on the Rayleigh channel;
[0041] D. Carry out maximum likelihood estimation to the signal that step C obtains, obtain signal Rx;
[0042] E. Demodulate the signal Rx to obtain the received signal x'.
[0043] The present invention will be further described below by specific examples.
[0044] 1) Randomly g...
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The invention discloses a multi-antenna internet of things information transmission method. A LoRa modulation adopts a time-space coding way, is sent by two antennas, and is transmitted in a way of receiving by two antennas, namely, the diversity degree of each of a sending end and a receiving end is increased, the diversity gain is acquired, and the reliability of transmitting the LoRa modulationsignal on the Rayleigh channel can be greatly improved; the existing LoRa technology is a new technology by itself, and is characterized in that the CSS spread spectrum modulation technology and theadjustable spread spectrum factor are used for realizing the self-adaptive data rate, but the LoRa modulation signal is relatively obviously influenced by the Rayleigh attenuation after entering the Rayleigh channel. Multiple transmitting antennas and receiving antennas are respectively used at the transmitting end and the receiving end, the signal is transmitted and received through multiple antennas at the transmitting end and the receiving end, and the communication quality is improved by combining with the novel transmission way of the LoRa transmission technology, the Rayleigh attenuationcan be effectively resisted, and the transmission reliability is well guaranteed.
Description
technical field [0001] The invention relates to the technical field of low-power wide-area network transmission, in particular to a multi-antenna Internet of Things information transmission method. Background technique [0002] Nowadays, the Internet of Things is developing rapidly, and the prospect is bright. At the same time, Internet of Things technology is quietly changing our lives. [0003] In the Internet of Things, LPWAN has become a more popular technology. There are many technologies in LPWAN: LoRa, SigFox, TELESA, INGENU. SigFox uses the modulation technology of UNB, which has a wide transmission range, but the network throughput is insufficient. Compared with SigFox, LoRa, although the transmission distance is not as wide as SigFox, its network throughput is greatly improved. [0004] Obviously, LoRa has more commercial value and has become a technology favored by developers. LoRa uses the CSS modulation method to make the signal more robust during transmissio...
Claims
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IPC IPC(8): H04L29/08H04B7/0413H04L1/06
CPCH04B7/0413H04L1/0618H04L67/12
Inventor 张沛昌黄磊孙维泽何春龙许家俊王一波杨丽鲜罗泉
Owner SHENZHEN UNIV