Joint Optimization Algorithm of Detection Threshold and Power Allocation for Satellite Underlay Cognitive Radio

doi:10.7652/xjtuxb201306006

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Joint Optimization Algorithm of Detection Threshold and Power Allocation for Satellite Underlay Cognitive Radio

更新时间：2025-05-01

- Joint Optimization Algorithm of Detection Threshold and Power Allocation for Satellite Underlay Cognitive Radio
- Vol. 47, Issue 6, Pages: 31-36+43(2013)
- 作者机构：
  
  中国空间技术研究院西安分院,西安,710100
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201306006
  CLC： TN927.23
- Online First：10 June 2013，
  
  Published：2013
- 稿件说明：
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Joint Optimization Algorithm of Detection Threshold and Power Allocation for Satellite Underlay Cognitive Radio[J]. 2013, 47(6): 31-36+43.
DOI：

Joint Optimization Algorithm of Detection Threshold and Power Allocation for Satellite Underlay Cognitive Radio[J]. 2013, 47(6): 31-36+43. DOI： 10.7652/xjtuxb201306006.

摘要

针对窄带卫星通信中频谱利用率不足的情况

以最大化带内数据传输量为目标

提出了基于卫星Underlay认知无线电的上行链路中信道检测门限与功率分配联合优化(JDPO)算法。首先根据检测误差、功率向量与数据传输量之间的运算关系构建了卫星Underlay认知无线电接入模型

之后将目标函数分解为检测门限与功率分配2个子问题分别进行优化

以加窗粒子群优化算法逼近了最优检测门限

根据库恩-塔克条件求解了最优功率分配向量。通过引入中间量使2个子算法反复迭代

最终得到了检测门限与功率分配的联合最优解。仿真结果表明:存在多个次要用户时

JDPO算法可以获得更多的带内数据传输量; 与传统方法相比

JDPO算法的数据传输量最大可提高50%。

Abstract

A joint detection threshold and power allocation optimization(JDPO)based on underlay cognitive radio is proposed to improve spectrum utilization in narrowband satellite systems. The joint scheme maximizes throughput and focuses on uplink. A corresponding model is established using the operation relationship among detection error

power allocation and throughput. Then

the optimization problem is partioned into two sub-problems: optimization of detection threshold and optimization of power allocation. A windowed particle swarm optimization is proposed to solve the former sub-problem

and the Kuhn-Tucker condition is applied to find the solution of the latter one. An intermediate variable is introduced to repeatedly perform iteration between both the sub-solutions to get the joint-optimal solutions for the detection threshold and power allocation. Simulation results and comparisons with the traditional satellite communication show that the JDPO scheme gets about 50% throughput increasing.

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references

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