论文标题
用CDMA在机器型通信中使用CDMA进行2步随机访问的性能分析
Performance Analysis of 2-Step Random Access with CDMA in Machine-Type Communication
论文作者
论文摘要
从四步随机访问到机器类型通信（MTC）中的2步随机访问的过渡越来越感兴趣，因为两步随机访问非常适合在各种物联网（IoT）应用程序中短信交付。在本文中，我们研究了一种使用代码分区多访问（CDMA）的两步随机访问方法，以形成多个通道，用于数据包传输的传播，其扩展因子小于频道数量。结果，2步随机访问中数据传输阶段的长度可以以多源干扰成本为短。为了了解数据传输阶段长度的减小如何提高光谱效率，我们得出吞吐量以及光谱效率。从分析的结果中，我们可以证明，基于2步CDMA的随机访问方法可以比传统的2步方法具有正交通道分配的传统2步方法更高，这意味着可以通过使用CDMA成功成功地传输更多单位时间数据包，从而改善MTC的性能。模拟结果也证实了这一点。
There is a growing interest in the transition from 4-step random access to 2-step random access in machine-type communication (MTC), since 2-step random access is well-suited to short message delivery in various Internet of Things (IoT) applications. In this paper, we study a 2-step random access approach that uses code division multiple access (CDMA) to form multiple channels for data packet transmissions with a spreading factor less than the number of channels. As a result, the length of data transmission phase in 2-step random access can be shorter at the cost of multiuser interference. To see how the decrease of the length of data transmission phase can improve the spectral efficiency, we derive the throughput as well as the spectral efficiency. From the results of analysis, we can show that the 2-step CDMA-based random access approach can have a higher spectral efficiency than conventional 2-step approach with orthogonal channel allocations, which means that the performance of MTC can be improved by successfully transmitting more data packets per unit time using CDMA. This is also confirmed by simulation results.
