In this paper,we propose a random access scheme termed sign-compute diversity slotted ALOHA(SCDSA).The SCDSA scheme combines diversity transmission with compute-and-forward.Without considering the capture effect and m...In this paper,we propose a random access scheme termed sign-compute diversity slotted ALOHA(SCDSA).The SCDSA scheme combines diversity transmission with compute-and-forward.Without considering the capture effect and multiple user detection techniques,our scheme can reach a high throughput of 0.98 without feedback under finite frame size settings,where the upper bound on performance is 1.Moreover,a lower bound on throughput performance is derived,which is tight in some parameter settings and can be used to approximate theoretical performance.Simulation results validate our analysis and confirm the advantages of our proposed scheme.展开更多
针对机器类通信(machine type communication,MTC)中海量用户接入网络造成的低成功接入概率问题,本文提出了一种面向MTC的新型多信道ALOHA(additive links on-line Hawaii area)随机接入方案。该方案分为导频传输阶段和数据传输阶段:导...针对机器类通信(machine type communication,MTC)中海量用户接入网络造成的低成功接入概率问题,本文提出了一种面向MTC的新型多信道ALOHA(additive links on-line Hawaii area)随机接入方案。该方案分为导频传输阶段和数据传输阶段:导频传输阶段允许一个信道被多个用户使用,而数据传输阶段根据用户的不同接入时延需求采用不同的数据传输策略,并且采用接入等级限制对数据传输的用户进行拥塞控制,进而提升用户成功接入概率。仿真结果表明,与现有多信道ALOHA随机接入方案相比,该方案能够极大地提升时延敏感用户成功接入概率和总用户成功接入概率。展开更多
文摘In this paper,we propose a random access scheme termed sign-compute diversity slotted ALOHA(SCDSA).The SCDSA scheme combines diversity transmission with compute-and-forward.Without considering the capture effect and multiple user detection techniques,our scheme can reach a high throughput of 0.98 without feedback under finite frame size settings,where the upper bound on performance is 1.Moreover,a lower bound on throughput performance is derived,which is tight in some parameter settings and can be used to approximate theoretical performance.Simulation results validate our analysis and confirm the advantages of our proposed scheme.
文摘针对机器类通信(machine type communication,MTC)中海量用户接入网络造成的低成功接入概率问题,本文提出了一种面向MTC的新型多信道ALOHA(additive links on-line Hawaii area)随机接入方案。该方案分为导频传输阶段和数据传输阶段:导频传输阶段允许一个信道被多个用户使用,而数据传输阶段根据用户的不同接入时延需求采用不同的数据传输策略,并且采用接入等级限制对数据传输的用户进行拥塞控制,进而提升用户成功接入概率。仿真结果表明,与现有多信道ALOHA随机接入方案相比,该方案能够极大地提升时延敏感用户成功接入概率和总用户成功接入概率。
