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Relay system energy efficiency optimization method based on OFDM

An optimization method and relay system technology, applied in transmission systems, digital transmission systems, energy consumption reduction, etc., can solve problems such as low-complexity algorithms that do not fully consider the logarithm of system user energy efficiency and optimal real-time requirements

Inactive Publication Date: 2017-01-04
辛建芳
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The existing OFDM-based relay system energy efficiency optimization method does not fully consider the optimal logarithm of system user energy efficiency, guarantee the fairness of user resource allocation, joint subcarrier allocation and power allocation, real-time requirements, and low-complexity algorithm practice. applications, etc.

Method used

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  • Relay system energy efficiency optimization method based on OFDM
  • Relay system energy efficiency optimization method based on OFDM
  • Relay system energy efficiency optimization method based on OFDM

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Embodiment 1

[0094] An OFDM-based relay system energy efficiency optimization method, comprising

[0095] Step 1: build system model;

[0096] The present invention is aimed at a special application scene, comes from practical application, and the scene setting is meticulous and reasonable, and has practical guiding significance. like figure 1 As shown, the present invention considers a two-hop multi-relay multi-user OFDM cellular system. In this system, there is a base station located in the center of the circle, the cell radiation radius is R, K relay nodes are r (r0 . All relay nodes apply the half-duplex AF relay mode, and can obtain instantaneous channel information under different subcarriers. The communication process of the system is divided into two time slots. In the first time slot, all relay nodes receive the signal broadcast from the base station, and each pair of subcarriers can only be used by one relay; in the second time slot, All relay nodes amplify the received signa...

Embodiment 2

[0128] On the basis of the first embodiment, the Lagrangian multiplier algorithm is used, and in the process of each loop iteration, we can use the sub-gradient method, and select the gradual step, so that the optimization is more accurate. Specifically, the Lagrangian factor β in the Lagrangian form of the optimization problem P1 ρ,n ,β s ,β r,k The iterative update method of using the sub-gradient algorithm has lower complexity and more efficiency. The iterative update equation of the sub-gradient algorithm is:

[0129] β ρ , n ( τ + 1 ) = [ β ρ , n ( τ ) - δ ρ , n ...

Embodiment 3

[0136] On the basis of the first embodiment, the present invention adopts the method of dual decomposition to solve the optimization problem P1. Specifically, the solution of the optimization problem P1 in step 3 may include dual decomposition:

[0137] The classical problem of convex optimization problems with zero duality interval has been proved. That is to say, the solution of the dual problem is exactly the same as the original problem. The present invention will introduce the fractional programming Dinkelbach algorithm to transform the fractional problem into the integer problem. Therefore, construct the Lagrangian function of the objective function:

[0138] L ( p s , k n , p ...

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Abstract

The invention discloses a relay system energy efficiency optimization method based on the OFDM, and belongs to the technical field of mobile communication. The method comprises the steps: building a system model; carrying out the analysis of a system scene; summing up problems; and solving an optimization problem through employing a convex optimization method. The method combines the integrated channel state information under the constraints of the maximum total power and minimum user instant speed, gives consideration to the joint optimization problem of enabling the energy efficiency to be maximized while considering to the equity, and gives a mathematical expression of user equity. Aiming at the solving of the optimization problem, the method employs the convex optimization processing, converts a target function of an optimization problem, does not need to carry out approximate calculation, does not affect the precision of the problem, greatly reduces the calculating complexity, and reduces the time delay caused by the system expenditure. The method is reasonable in algorithm design, and is easy to implement.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and more particularly, relates to an OFDM-based energy efficiency optimization method for a relay system. Background technique [0002] The research on OFDM technology has matured as early as the end of the 20th century. However, traditional cellular networks have two major shortcomings. On the one hand, the high signal transmission power of the base station makes the energy consumption of the whole system too high. In a network environment, the signal transmission power will gradually attenuate, which may cause signal distortion and thus lead to reception errors. These shortcomings make relay-based collaboration technology into people's field of vision. It is not only cheap, but also highly flexible and extensible. It can indirectly extend the network distance, further ensure the quality of service (QoS) for edge users, and improve traditional communication networks. system perform...

Claims

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Application Information

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IPC IPC(8): H04W72/04H04L5/00
CPCH04L5/0007H04L5/0094H04W72/04H04W72/0453Y02D30/70
Inventor 辛建芳李淑敬李林国
Owner 辛建芳
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