Distributed cross-layer optimization method for MIMO (Multiple Input Multiple Output) wireless multi-hop network

A wireless multi-hop network and cross-layer optimization technology, applied in the field of distributed cross-layer optimization, can solve the problem that the system model has no transmission power limit and power allocation

Active Publication Date: 2015-12-16
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology

However, the system model in the literature has no transmission power limitation and power allocation

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  • Distributed cross-layer optimization method for MIMO (Multiple Input Multiple Output) wireless multi-hop network
  • Distributed cross-layer optimization method for MIMO (Multiple Input Multiple Output) wireless multi-hop network
  • Distributed cross-layer optimization method for MIMO (Multiple Input Multiple Output) wireless multi-hop network

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Embodiment Construction

[0044] In order to make the above and other objects, features and advantages of the present invention more apparent, further detailed description will be given below.

[0045] In the MIMO wireless multi-hop network system model, the secondary user (SU) and the primary user (PU) are equipped with multiple antennas, and the SU uses the frequency band resource shared by the PU. Assuming that each link experiences flat fading, SUs construct an FDMA MIMO multi-hop network, which can be represented as a directed graph collection of them represents all SU nodes, represent all possible links in the network. Assuming that the network is strongly connected, in a MIMO wireless multi-hop network, the source node sends data to the destination node through multi-hop and multi-path. Since non-overlapping frequency band resources are assigned to each SU's receiving and transmitting links, SUs can simultaneously transmit data without interfering with each other.

[0046] In this model, ...

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Abstract

The invention discloses a distributed cross-layer optimization method for an MIMO (Multiple Input Multiple Output) wireless multi-hop network. The method comprises the following steps: solving the problems of routing of a network layer and rate optimization of a transport layer according to a current session and routing information in a network by a source node of each session stream, and updating the session streams and the routing information; and solving the problems of multi-antenna power control of a physical layer and bandwidth allocation of a link layer on each node. An alternate iterative update method based on linearization is provided to solve problems; a power control sub-problem is solved by fixing of a link bandwidth on each node; then, power is fixed as a previous solution; a bandwidth allocation sub-problem is solved; and a physical layer problem is solved by alternate iterative update. Finally, solutions of the problems of a network transport layer and a physical link layer are converged through iterative update of Lagrange dual variables, so that network utility is realized, and the transmitted power is lowered at the same time. Through adoption of the method, the loss of the transmitted power, namely, energy consumption is lowered greatly while the network utility is ensured.

Description

technical field [0001] The invention relates to the technical field of wireless communication transmission, in particular to a low-power distributed cross-layer optimization method for node data transmission in a MIMO (Multiple Input Multiple Output) wireless multi-hop network. Background technique [0002] The AdHoc network is a distributed, autonomous, multi-hop network. There are no fixed basic network nodes in the entire network, and it can be established without using or inconveniently using existing network nodes (such as mobile base stations, APs, etc.). The wireless communication network provides communication services for the nodes. The AdHoc network utilizes the routing and forwarding function of the mobile node to conduct wireless communication without a basic network, thus solving the problem of wireless communication when the mobile basic network is destroyed or there is no mobile basic network. [0003] MIMO technology is a multi-antenna wireless communication...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/26H04W52/34H04W52/46
CPCH04W52/267H04W52/346H04W52/46
Inventor 徐伟强袁文初史清江
Owner ZHEJIANG SCI-TECH UNIV
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