Method for optimizing energy efficiency in OFDM multi-relay network

A technology of energy efficiency and optimization method, which is applied in the direction of multi-frequency code system, multiple use of transmission path, separation device of transmission path, etc., can solve problems such as high computational complexity and insufficient resource utilization

Inactive Publication Date: 2015-03-25
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0012] Technical problem: The present invention aims at the high computational complexity and insufficient resource utilization of the traditional OFDM multi-relay network resource allocation method, and p

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  • Method for optimizing energy efficiency in OFDM multi-relay network
  • Method for optimizing energy efficiency in OFDM multi-relay network
  • Method for optimizing energy efficiency in OFDM multi-relay network

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with embodiment and accompanying drawing:

[0033] 1. Multi-relay OFDM network system model

[0034] In the present invention, a two-hop OFDM-based multi-relay network is considered. The relay network consists of a source node S, a destination node D, and a relay node set {R consisting of K relays 1 , R 2 ,...,R K}constitute. We assume that the transmission bandwidth allocated to the source node S is equally divided into N subcarriers, and each channel occupies the same bandwidth and experiences independent frequency-selective Rayleigh fading. We assume that each relay node knows its forward and backward instantaneous channel information, and all channel instantaneous information is known at source node S and destination node D. The communication mode adopts half-duplex mode, and the whole communication process is divided into two time slots. In the first time slot, the source node S broadcasts the ...

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Abstract

The invention discloses a resource distribution method for maximizing the energy efficiency of a system under the premise that the minimum transmission rate of the system is met in the multi-relay OFDM network. In the relay network, one sub-carrier wave can be allocated to a source node and multiple relay nodes, and therefore a space diversity can be provided for the system. The optimal model including sub-carrier pairing and power distribution to maximize the power efficiency of the system is a typical nonlinear mixed integer programming problem, and the problem usually has great computation complexity. According to the resource distribution method, the optimal solution is obtained by defining the equivalent channel gain and simplifying the original complex optimization problem into a quasi concave programming problem through the Dinkelbach method, the Hungarian algorithm and the subgradient algorithm, and the computing complexity is greatly lowered.

Description

technical field [0001] The invention discloses a resource allocation method for maximizing energy efficiency in an OFDM multi-relay network, and belongs to the technical field of wireless communication. Background technique [0002] Multiple-input multiple-output (MIMO) technology can effectively resist the influence of multipath fading in wireless communication, but it is difficult to be applied in actual wireless communication terminals due to the limitations of equipment size, cost and hardware performance. Cooperative communication technology utilizes mutual cooperation among single-antenna mobile terminals to share each other's antennas to form a virtual MIMO system, thereby obtaining space diversity. Future wireless communication systems need to provide more high-speed multimedia services and data services. The purpose of cooperative communication is to make full use of node resources in the network to help nodes with communication needs perform high-speed and reliable...

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Application Information

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IPC IPC(8): H04L27/26H04L5/00
CPCH04L5/0076H04L5/0007
Inventor 朱琦周志康朱洪波杨龙祥
Owner NANJING UNIV OF POSTS & TELECOMM
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