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Mode division multiple access method based on orbital angular momentum (OAM)

An access method and modulo division technology, applied in diversity/multi-antenna systems, space transmit diversity, optical mode multiplexing systems, etc., can solve the problems of shortage of spectrum resources, low spectrum utilization, limited connection equipment, etc. The effect of large transmission distance, reducing interference and improving quality

Inactive Publication Date: 2018-04-06
NANJING UNIV OF POSTS & TELECOMM
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method solves the problems of shortage of spectrum resources, low spectrum utilization, and limited connection devices in mobile data transmission in the case of explosive growth of mobile data services

Method used

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  • Mode division multiple access method based on orbital angular momentum (OAM)
  • Mode division multiple access method based on orbital angular momentum (OAM)
  • Mode division multiple access method based on orbital angular momentum (OAM)

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Embodiment Construction

[0030] The invention will be described in further detail below in conjunction with the accompanying drawings.

[0031] like figure 1 Shown is a schematic diagram of the orbital angular momentum. It represents the difference between the OAM beam and the traditional electromagnetic beam.

[0032] like figure 2As shown, the millimeter wave system targeted by the present invention is a schematic diagram of a typical indoor intelligent network system, and there are multiple terminals A, B, C, D and a signal transceiving device E in the room. The transceiver device E can send a large amount of content (such as high-definition video) to each user at the same time, and at the same time, the terminals A, B, C, and D can upload content to the device E. In addition, the terminals can also communicate, because there is no obstacle between A and C , A and C can directly carry out line-of-sight communication. OAM-based modular division multiple access technical scheme, this technical s...

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Abstract

The invention discloses a mode division multiple access method based on orbital angular momentum (OAM). The method comprises the following steps: modulating M (M is greater than or equal to 1) paths of baseband signals onto a millimeter wave (the formula is described in the specification) carrier of an OAM mode produced by a phased array antenna and carrying an eigenvalue li, wherein the OAM modeis expressed by a Laguerre-Gaussian beam, a total sending signal is expressed as (the formula is described in the specification), and the total signal received by a receiving end is (the formula is described in the specification); then after k (k is smaller than or equal to M and is greater than or equal to l) terminals receive the signal (the formula is described in the specification), using a receiving antenna array to analyze the own necessary ith path of baseband signals from the (the formula is described in the specification) to obtain the ith path of baseband receiving signals; and finally performing sampling and quantitative processing on (the formula is described in the specification) to obtain quantitative baseband receiving signals (the formula is described in the specification),wherein T represents a code element interval. The invention provides a mode division multiple access scheme using the OAM mode as a new degree of freedom by using the orthogonality of the OAM beams and the Hilbert space characteristics of the mode l thereof, and the mode division multiple access scheme provided by the invention can improve the spectrum utilization rate and increase the equipmentconnection number, thereby greatly improving the capacity of a millimeter wave system and satisfying the transmission requirements of mass data in the future, and the application prospect is extensive.

Description

technical field [0001] The invention relates to a multiple access method in a millimeter wave system, in particular to an OAM-based mode division multiple access (MDMA) method. Background technique [0002] With the explosive growth of demand for mobile data services, spectrum resources and spectrum utilization are facing enormous challenges. The utilization of traditional spectrum resources below 3 GHz has approached saturation, and the spectrum utilization rate has also approached the Shannon capacity limit, which has become a bottleneck for network capacity improvement. In the future, various services, such as the application of ultra-high-definition (4K, 8K) video services, will further increase the demand for spectrum resources in wireless communications, making low-frequency spectrum resources suitable for wireless communications services increasingly scarce; at the same time, with the development of Internet of Things technology , the number of connected devices in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/04H04B7/204H04B7/08H04W16/14
CPCH04J14/04H04B7/08H04B7/204H04W16/14
Inventor 王磊郑宝玉周亮赵磊陈鸣锴王乐
Owner NANJING UNIV OF POSTS & TELECOMM
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