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A communication system and method for millimeter wave Internet of things based on beam modulation

A millimeter wave and Internet of Things technology, applied in the field of Internet of Things communication, can solve the problems of high algorithm complexity, high cost of millimeter wave communication, and high hardware cost, and achieve the effect of low complexity, low complexity, and low cost

Active Publication Date: 2022-01-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a millimeter-wave Internet of Things communication system based on beam modulation for the high cost of millimeter-wave communication caused by the high hardware cost and high algorithm complexity (requiring channel estimation, beamforming, etc.) of the existing millimeter-wave system Different from the traditional millimeter-wave algorithm that only considers the strongest channel transmission path, this system makes full use of the line-of-sight path and non-line-of-sight path of the millimeter-wave channel for signal transmission, and the attenuation of the millimeter-wave signal is different based on different paths of the channel It can make the unmodulated millimeter wave signal sent by the node have different energy after channel transmission and reach the receiving end, and realize a modulation effect similar to ASK, that is, beam modulation; in the proposed Internet of Things system based on beam modulation, the node device Different antenna groups are enabled according to the different information bits in the transmitted data frame, so that the millimeter wave signal can propagate along different paths in the channel, and the receiving end determines the judgment method according to the received energy of the millimeter wave signal of the preamble in the corresponding frame , and use it as the beam-modulated millimeter-wave signal corresponding to the data part in the frame to decode, recover the transmitted information, and thus realize the entire communication process; the system does not need to modulate the millimeter-wave signal before transmission, and does not need channel estimation. Deploy multiple sets of antennas at the receiving end to achieve space division multiple access, which greatly reduces the complexity of the system and improves the channel capacity and spectral efficiency of the mmWave system

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  • A communication system and method for millimeter wave Internet of things based on beam modulation

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Embodiment 1

[0034] The millimeter-wave Internet of Things communication system based on beam modulation in an exemplary embodiment of the present invention includes: a sending-end device, a millimeter-wave channel, and a receiving-end device;

[0035] Wherein, the sending-end device can switch and send multiple millimeter wave signals according to the order of the information bit sequence of each frame of data, so that the millimeter-wave signals propagate along different paths of the millimeter-wave channel; wherein, the sending-end device The transmitted millimeter wave signal is a millimeter wave signal with the same frequency and the same amplitude;

[0036] The millimeter wave channel can perform beam modulation on the millimeter wave signal with the same frequency and the same amplitude, and the beam modulation is: when the millimeter wave signal with the same frequency and the same amplitude is transmitted along different paths of the millimeter wave channel, It will experience dif...

Embodiment 2

[0070] In this example, we set and That is, the two main lobes of beam0 are respectively located in the ±30° direction of the normal line of the antenna array. By analyzing the number of antennas, we can get the number of sending node antennas N node = 4, the corresponding beamwidth is θ BW =29.3°. In addition, the central AP is equipped with N AP = 64 antennas and M AP = 8 RF chains to communicate with the surrounding K = 5 nodes. where each node contains two sets of N node = 4 antennas and M node = 1 RF chain. Through the simulation experiment of the proposed communication system, since the number of antennas of the transmitting node is fixed, the test simulation results are as follows image 3 As shown, the channel capacity tests of MIMO systems with different numbers of receiving antennas N=4, 8, 16, 32, and 64 are respectively verified.

[0071] further, Figure 4 It shows a schematic diagram of the change of the average bit error rate as the number of nodes ...

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Abstract

The present invention discloses a beam modulation-based millimeter wave Internet of Things communication system and method. The transmitting device in the system can transmit millimeter waves in different directions with different information bit sequences in the data frame; when the different directions When the millimeter wave beam is transmitted along different paths in the channel, it will experience different degrees of attenuation, that is, the energy of the beam will show energy differences after passing through different paths, and the unmodulated millimeter wave signal will have different energy after propagating through different paths of the channel and reaching the receiving end. , which achieves an effect similar to ASK modulation, that is, beam modulation; the receiving end device can determine the decision standard of the signal according to the received energy of the millimeter wave signal of the preamble corresponding to the data frame, and according to the obtained decision standard To complete the decoding of the information field in the data frame and complete the transmission of information. The system does not need to perform channel estimation, does not need complex decoding algorithms, has relatively low algorithm complexity, and realizes low-cost and high-efficiency transmission.

Description

technical field [0001] The present invention relates to the technical field of Internet of Things communication, in particular to a communication system and method for millimeter wave Internet of Things based on beam modulation. Background technique [0002] It is estimated that by 2025, the total number of IoT devices will reach 75 billion worldwide, growing at a rate of 23.76% per year. With the exponential growth of IoT devices, it is believed that developing scalable, energy-efficient, and reliable IoT connectivity solutions can bring great benefits to society and industry. Unfortunately, at present, IoT devices are mainly oriented to low-speed application scenarios, and the communication frequency band used is low, which cannot meet the current IoT communication requirements for large data volume and high-speed transmission. The huge growth of IoT devices poses great challenges to future wireless communication systems, especially when broadband IoT services are require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0408H04B7/06H04B7/08H04L27/04H04L27/06
CPCH04B7/0408H04B7/0695H04B7/088H04L27/04H04L27/06
Inventor 李帅陈杰男罗斯瑜邢静
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA