Energy Pricing Based Network Lifetime Optimization Algorithm for Cooperative OFDM Systems

PANG Li-hua; LI Jian-dong; ZHANG Yang; CHEN Dan

doi:10.3969/j.issn.0372-2112.2012.04.013

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Energy Pricing Based Network Lifetime Optimization Algorithm for Cooperative OFDM Systems

更新时间：2025-07-16

- Energy Pricing Based Network Lifetime Optimization Algorithm for Cooperative OFDM Systems
- Acta Electronica Sinica Vol. 40, Issue 4, Pages: 703-709(2012)
- 作者机构：
  
  西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西,西安,710071
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0372-2112.2012.04.013
  CLC： TN929.5
- Published：2012
- 稿件说明：
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PANG Li-hua, LI Jian-dong, ZHANG Yang, et al. Energy Pricing Based Network Lifetime Optimization Algorithm for Cooperative OFDM Systems[J]. Acta Electronica Sinica, 2012, 40(4): 703-709.
DOI：

PANG Li-hua, LI Jian-dong, ZHANG Yang, et al. Energy Pricing Based Network Lifetime Optimization Algorithm for Cooperative OFDM Systems[J]. Acta Electronica Sinica, 2012, 40(4): 703-709. DOI： 10.3969/j.issn.0372-2112.2012.04.013.

摘要

本文研究两跳协作多中继正交频分复用(OFDM)系统的网络寿命优化问题.为使网络寿命最大化

基于对节点能量的定价提出一种穷举算法

即首先列举所有的子载波配对与中继选择联合决策;在每种决策下利用拉格朗日法求解最优功率分配

使得网络在满足一定吞吐量的前提下消耗能量总价值最小;然后选择损耗能量价值最小的联合决策.由于穷举算法受到计算复杂度的限制

进而基于子载波的单位信噪比(SNR)代价将中继选择与子载波配对分步优化

提出两种低复杂度算法.仿真结果表明

本文各算法的网络寿命性能比已有算法均有显著提高.

Abstract

This paper investigates the network lifetime optimization issue for two-hop cooperative Orthogonal Frequency Division Multiplexing (OFDM) systems recruiting multiple relays.In order to maximize the network lifetime

we propose an exhaustive algorithm which takes energy pricing concept into account.Specifically

all possible combinatorial strategies of subcarrier pairing and relay selection are firstly formulated and by applying standard Lagrange technique

the optimal power assignment which minimizes the total energy consumption subject to network throughput constraints

can be theoretically derived.Accordingly

the candidate with smaller energy sacrifice is designated as the optimum solution.Since the real world applications of the proposed approach are restricted by prohibitively high computational complexity

two low complexity alternatives are consequently designed based on the price of unit Signal-to-Noise Ratio (SNR).The essence of these methods is that relay selection and subcarrier pairing are optimized in two steps.Simulation results indicate that

the network lifetime performance of the proposed algorithms significantly outperforms the existing schemes.

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