Spectrum Efficiency Analysis and Adaptive Transceiver Design for Single-Carrier Multiuser Transmission
Spectrum Efficiency Analysis and Adaptive Transceiver Design for Single-Carrier Multiuser Transmission
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DOI：
10.1109/tvt.2014.2360850
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发表时间：
2015-08
影响因子：
6.8
通讯作者：
W. Peng;F. Adachi;Xiaodong Wang;Tao Jiang
中科院分区：
文献类型：
--
作者：
W. Peng;F. Adachi;Xiaodong Wang;Tao Jiang
本文研究了多用户单载波传输的频谱效率问题。在SC多用户传输中，可以通过使用干扰抑制来实现多用户接入，例如，SC频域自适应天线阵列（SC-FDAAA）收发器，或者通过用户之间的正交频率分配，例如，SC频分多址（SC-FDMA）收发器。为了评估系统频谱效率，分别推导了SC-FDAAA接收机和SC-FDMA接收机输出端的信号干扰噪声比（SINR）。然后评估系统频谱效率，并对两个收发器进行比较。结果表明，在慢发射功率控制的假设下，SC-FDMA收发机的系统频谱效率不随用户数的变化而变化，而SC-FDAAA收发机的频谱效率在最优用户数处达到最大值，该最优用户数由接收天线数和目标接收信噪比（SNR）共同决定.在此基础上，提出了一种基于非正交频率分配和频域干扰抑制的SC自适应收发器，以提高系统的频谱利用率，数值结果表明了该方案的有效性。
In this paper, the spectrum efficiency of multiuser single carrier (SC) transmission is considered. In SC multiuser transmission, multiuser access can be realized by using interference suppression, e.g., SC frequency-domain adaptive antenna array (SC-FDAAA) transceiver, or by orthogonal frequency allocation among users, e.g., SC frequency-division multiple access (SC-FDMA) transceiver. To evaluate the system spectrum efficiency, the signal-to-interference-plus-noise ratio (SINR) at the output of the SC-FDAAA receiver and the SC-FDMA receiver is derived, respectively. The system spectrum efficiency is then evaluated and compared for both transceivers. It is shown that under the assumption of slow transmit power control, the system spectrum efficiency of the SC-FDMA transceiver does not change with the number of users, whereas the spectrum efficiency of the SC-FDAAA transceiver reaches its maximal value by an optimal number of users, which is determined by both the number of receive antennas and the target receive signal-to-noise ratio (SNR). With this observation, an SC-adaptive transceiver is proposed based on unorthogonal frequency allocation and frequency-domain interference suppression to improve the system spectrum efficiency, and the proposed scheme has been shown to be effective by numerical results.