干扰背景下OFDM系统自适应功率分配优化  

Adaptive power allocation optimization for OFDM systems under interference background

作　　者：王建波 尹康军 魏旭 熊霞 马添乐 WANG Jianbo;YIN Kangjun;WEI Xu;XIONG Xia;MA Tianle(Guizhou Aerospace Nanhai Technology Co.,Ltd.,Zunyi,Guizhou 563000;Placeholder,Military Representative Office of Chengdu Bureau,Sichuan,Chengdu 610000;Big data and Computer Science College of Guizhou Normal University,Guiyang 550000)

机构地区：[1]贵州航天南海科技有限责任公司,贵州遵义563000 [2]空装成都局某军事代表室,四川成都610000 [3]贵州师范大学大数据与计算机科学学院,贵州贵阳550000

出　　处：《长江信息通信》2023年第12期206-208,212,共4页Changjiang Information & Communications

摘　　要：OFDM自适应分配结合了自适应调制技术和自适应分配算法,自适应分配算法根据获取的信道状态信息为每个子载波分配比特数和功率,自适应调制根据自适应算法提供的比特数和功率参数,对子信道配置选择相应的调制方式,以实现子载波的比特和功率的分配,从而提升系统的性能。文章采用常见的几种自适应比特功率算法解决OFDM资源分配问题,分析和比较了这几种算法。数值结果表明Fischer算法比Hughes-Hartogs算法更容易影响系统信道容量,并且该算法计算复杂度相对低,易于实现。在相同的SNR下,采用Fischer算法解决比特功率分配问题,信道容量受干扰环境影响明显。The adaptive allocation for OFDM system combines adaptive modulation technology and adaptive allocation algorithm.The adaptive allocation algorithm allocates the number of bits and power for each subcarrier based on the obtained channel state information.To achieve bits and power allocation of sub-channel,based on the number of bits and power parameters provided by the adaptive algorithm,a suitable adaptive modulation method is selected for the corresponding sub-channel.Thus it can improve system performance significantly.Several common adaptive bit power algorithms to solve OFDM resource allocation problems are used.The numerical results show that Fischer algorithm is more likely to affect the system Channel capacity than Hughes-Hartogs algorithm.And the algorithm has relatively low computational complexity and is easy to implement.Also,under the same SNR parameter condition,the Channel capacity with Fischer algorithm is significantly affected by the interference environment.

关 键 词：OFDM技术 比特功率分配 信道容量 误码率 

分 类 号：TN929.5[电子电信—通信与信息系统]