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Single-user large-scale antenna relay system power allocation method based on energy efficiency optimization

A large-scale antenna and relay system technology, applied in power management, wireless communication, electrical components, etc., can solve problems such as no analytical expression, difficult solution process, complex objective function, etc.

Active Publication Date: 2016-01-13
SOUTHEAST UNIV
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Problems solved by technology

Because the objective function in this model is too complex and there is no precise analytical expression, it is very difficult to solve the optimization problem, and it is not easy to obtain a low-complexity solution

Method used

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  • Single-user large-scale antenna relay system power allocation method based on energy efficiency optimization
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  • Single-user large-scale antenna relay system power allocation method based on energy efficiency optimization

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Embodiment Construction

[0073] Combine figure 2 The algorithm flow chart shown in the present invention specifically describes a single-user large-scale antenna relay system power allocation method based on the best energy efficiency of the present invention, including the following steps:

[0074] 1). The relay node obtains its ideal channel state information between all source nodes and sink nodes through channel estimation, that is, the channel vector with And both h and g obey the complex Gaussian distribution Assuming that the system adopts the time division duplex system and the channel obeys flat block fading, that is, the channel coefficient remains unchanged during the channel coherence time;

[0075] 2). Established at the relay node to maximize the total system energy efficiency function η(ρ s ,ρ r ) Is the goal, the minimum spectrum efficiency of the system is the constraint, and the source node transmit power ρ s And relay node transmit power ρ r The mathematical optimization model for the ...

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Abstract

The invention discloses a single-user large-scale antenna relay system power allocation method based on energy efficiency optimization. A communication system consists of a single antenna information source node, a single antenna information sink node, and a relay node transceiver configured with a large scale of antennas, and is shown in accompanying drawings in the summary. According to the method, a mathematical optimization model taking transmitting powers of the information source node and a relay node as design variables is built specific to a design objective of system energy efficiency maximization under a constraint condition of satisfying specified system quality of service (QoS). Since an accurate analytical expression is unavailable for an objective function in an optimization problem, an accurate approximate analytical expression of the objective function is obtained by means of a law of large numbers in a large-dimension random matrix theory. Then, a non-convex objective function is transformed into a convex function through interval approximation equivalence with a large signal-to-noise ratio. Through a Lagrange dual function convex optimization algorithm, a closed-form solution of a power allocation scheme is obtained finally by means of a Lambert W function, so that solving of the optimization problem with an alternate iteration method is avoided.

Description

Technical field [0001] The invention belongs to the technical field of wireless communication, and specifically relates to a power distribution method for a single-user large-scale antenna relay system based on optimal energy efficiency. Background technique [0002] In the past ten years, relay wireless communication technology has been paid attention to by many scholars and manufacturers, and has achieved tremendous development. By adding a relay node to the cellular system to forward and transmit signals, the entire system has achieved significant improvements in terms of link reliability, cell coverage, and system spectrum efficiency. In particular, the relay system does not need a wired backhaul link as support, which greatly reduces the deployment cost of operators. Therefore, relay wireless communication technology is also widely regarded as an important part of future heterogeneous wireless communication networks. [0003] At the same time, the newly proposed massive mult...

Claims

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Application Information

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IPC IPC(8): H04W52/04
CPCH04W52/228H04W52/241
Inventor 李春国王毅杨绿溪王东明郑福春
Owner SOUTHEAST UNIV
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