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Nonlinear amplification-retransmission optimal power allocation method

An optimal power, forwarding and relay technology, applied in power management, wireless communication, electrical components, etc., can solve problems such as research and discussion of optimal power allocation in non-linear relay networks

Inactive Publication Date: 2012-01-25
XI AN JIAOTONG UNIV
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Problems solved by technology

However, according to the current research, there is no research and discussion on the optimal power allocation of nonlinear relay networks.

Method used

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  • Nonlinear amplification-retransmission optimal power allocation method
  • Nonlinear amplification-retransmission optimal power allocation method
  • Nonlinear amplification-retransmission optimal power allocation method

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Embodiment Construction

[0079] The present invention is described in further detail below in conjunction with accompanying drawing:

[0080] see Figure 1-5 , the optimal power allocation method for nonlinear amplifying-forwarding relays, according to the following steps:

[0081] 1) Consider a network of N relays. pass figure 1 Demonstrates the intermediate network signal transmission process. The signal transmission process is divided into two stages. In the first stage, the source node broadcasts the signal to all relays, and the signal received by the i-th relay is:

[0082] r i = P s f i s + n i - - - ( 14 ) ;

[0083] where P s is the transmitting power of the source node, f i is the channel coefficient from the...

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Abstract

The invention discloses a nonlinear amplification-retransmission optimal power allocation method. The method comprises the following steps: an ideal amplitude-limiting amplifier model is constructed into a linear model with a Gaussian distortion noise option by using a linearized theory; according to the linear model, the chain equivalent single-to-noise rate of each nonlinear relay, devoted to a target receiver, is calculated; in order to obtain the optimal signal-to-noise rate performance, a maximum-combination-ratio receiver which is capable of realizing the nonlinear distortion is also designed; then, an optimal relay power allocation mathematical model is built, although the optimal power allocation problem is not a convex problem is found by analyzing a curve structure of signal to noise rate and power, the optimal relay power allocation problem can be converted into a convex optimization problem by limiting the maximum emission power; and finally, an optimal power allocation scheme is provided by utilizing a lagrangian multiplier method. A theoretical analysis and simulation result indicates that the method disclosed by the invention is superior to an optimal power allocation algorithm has no sense to nonlinear distortion, and has the capability of effectively improving the system capacity.

Description

Technical field: [0001] The invention belongs to a relay power distribution method of a wireless relay network, and in particular relates to a method for realizing optimal power distribution of a nonlinear amplifying-forwarding relay. Background technique: [0002] Wireless relay technology is a new technology that utilizes geographically dispersed single-antenna wireless nodes to achieve space diversity. It utilizes the broadcast characteristics of the wireless channel and the idle nodes in the network to solve the problem that a wireless terminal cannot obtain space diversity gain by installing multiple antennas due to the limitation of size, transmission power, and system cost. Since the concept of wireless relay (also known as cooperative communication) was formally proposed in 2003, wireless relay technology has attracted great attention from academia and industry. Industry and mobile communication operators have also placed high expectations on wireless relay technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/24H04W72/04H04L25/02
Inventor 张超任品毅王熠晨杜清河徐静
Owner XI AN JIAOTONG UNIV
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