| 摘要: |
| 在通信距离不尽相同节点的最优适用频段可能会部分重叠的背景下，针对水声系统频率资源利用率低的问题，提出了一种基于部分非正交多址接入(Partial Non-orthogonal Multiple Access，P-NOMA)技术的上行链路水声通信方法。该方法中各P-NOMA节点在非重叠频段内采用正交多址接入技术传输信息，〖JP2〗在重叠频段内利用最大或受限的发送功率同时同频发送信息给目的节点，目的节点采用串行干扰消除方法提取重叠频段内的各P-NOMA节点信息。根据功率谱密度与容量之间的关系，分析了P-NOMA节点在注水算法和功率均匀分布下的可达容量，以及信干噪比限制对最小发射功率的影响。仿真结果验证了基于P-NOMA技术的水声上行通信网络在系统容量方面具有的优势。 |
| 关键词: 水声通信 部分非正交多址接入(P-NOMA) 发射功率 可达容量 |
| DOI：10.20079/j.issn.1001-893x.211020005 |
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| 基金项目:广西自然科学基金项目(2020GXNSFBA159051)；广西高校中青年教师科研基础能力提升项目(2020KY10020,2019KY0449）；北部湾大学高层次人才科研启动项目(2019KYQD40) |
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| Capacity analysis of P-NOMA based uplink underwater acoustic communication networks |
| YAN Xiaojuan,ZHANG Qianfeng,LI Dan,TAO Weiping,FAN Yongbin |
| (Key Laboratory of Beibu Gulf Offshore Engineering Equipment and Technology, Education Department of Guangxi Zhuang Autonomous Region,Beibu Gulf University,Qinzhou 535011,China;College of Electronics and Information Engineering,Beibu Gulf University,Qinzhou 535011,China) |
| Abstract: |
| Under the background that the optimal communication frequency bands of underwater acoustic nodes with different communication distances may overlap partially,to solve the low resource utilization efficiency problem of underwater acoustic communications,a partial non-orthogonal multiple access(P-NOMA) based uplink underwater acoustic communication scheme is proposed.In the proposed strategy,each P-NOMA node uses orthogonal multiple access technology to transmit information in their non-overlapping frequency band;while in the overlapped frequency band,P-NOMA nodes,with their maximum or limited transmission power,simultaneously transmit information to the destination node,which uses a serial interference cancellation(SIC) method to extract the information of each P-NOMA node.Specially,the power spectral density is related to the achievable capacity,and then the achievable performance of each P-NOMA node under water-filling algorithm and uniform power distribution is analyzed,respectively,as well as the impact of signal-to-interference-plus-noise ratio on the minimum transmission power.Numerical simulation results are provided to show the advantages of the P-NOMA based underwater acoustic uplink communication network. |
| Key words: underwater acoustic communication partial non-orthogonal multiple access(P-NOMA) transmission power achievable capacity |
