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Ad hoc network multi-user extension method based on OFDMA

An extension method and an ad hoc network technology, applied in the multi-user extension field of an ad hoc network, can solve the problems of large user transmission delay, difficulty in meeting the requirements of high-speed and smooth communication of mobile terminals, and reduced efficiency, so as to shorten the transmission time. delay, resist multipath effect, and reduce the effect of transmission delay

Active Publication Date: 2020-04-14
HUBEI KAILE SCI & TECH
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Problems solved by technology

However, only one user in the network can send data at a time, and its efficiency decreases as the number of users increases, and the transmission delay of users is large, so it is difficult to meet the high-speed and smooth requirements of today's users for mobile terminal communication.

Method used

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  • Ad hoc network multi-user extension method based on OFDMA
  • Ad hoc network multi-user extension method based on OFDMA
  • Ad hoc network multi-user extension method based on OFDMA

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specific Embodiment

[0026] A specific embodiment is as follows: an OFDMA-based multi-user extension method for an ad hoc network, characterized in that: it is realized by including the following steps:

[0027] Step 1, define the bandwidth W, divide the bandwidth W into N subcarriers, and form an OFDM symbol; the system defines M mutually orthogonal ZC sequences, M>128, and the length of the ZC sequences is 1, and these M are mutually orthogonal The ZC sequence is used to distinguish each user in the cell and becomes a user label; the size of M determines the number of users in the cell;

[0028] Step 2. Define the combination of K user tags, K>16, that is, each user ZC sequence can be sent continuously at most 5 times, at least once, and select the corresponding The 16 ZC sequences that specify the subcarrier allocation method are called resource labels; this long sequence of resource labels repeated 5 times is called a synchronization sequence, and each user periodically broadcasts its own sync...

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Abstract

The invention relates to an ad hoc network multi-user extension method based on OFDMA, and belongs to the technical field of mobile terminal communication. By including seven steps, multiple access transmission is realized, the transmission efficiency is greatly improved, the transmission time delay is effectively shortened, and the method has the advantages of inhibiting narrowband interference,resisting multipath effect and coping with frequency selective fading; dividing the whole bandwidth into a plurality of sub-channels which are overlapped with one another among sub-bands; wherein eachsub-channel comprises a plurality of orthogonally modulated sub-carriers, each sub-channel is allocated to one user, or one user can occupy a plurality of sub-channels, and if the users in the two user groups cannot directly communicate with each other, the same physical resources can be used to independently form a token ring; and high-speed and smooth communication of the multi-user mobile terminal is ensured. The problems that in the prior art, only one user can send data at each moment, the transmission efficiency is reduced along with increase of the number of the users, the user transmission delay is large, and the requirements of the users for high-speed and smooth communication of the mobile terminal are difficult to meet are solved.

Description

technical field [0001] The invention relates to an OFDMA-based multi-user extension method of an ad hoc network, which belongs to the technical field of mobile terminal communication. Background technique [0002] The existing COFDM-based Mesh ad-hoc network solution, each user uses all the bandwidth to send information, and realizes asynchronous communication through token ring. The data are more reliable. However, only one user in the network can send data at any time, and its efficiency decreases with the increase of the number of users, and the transmission delay of users is large, so it is difficult to meet the high-speed and smooth requirements of today's users for mobile terminal communication. In order to improve transmission efficiency and shorten time delay, it is necessary to develop and provide an OFDMA-based multi-user extension method for ad hoc networks. Contents of the invention [0003] The purpose of the present invention is to address the shortcomings ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L5/00
CPCH04L27/2601H04L5/003
Inventor 张拥军吴昊王纪肖肖登国
Owner HUBEI KAILE SCI & TECH
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