Enhancement of throughput and fairness in 4G wireless access systems by non-orthogonal signaling
Enhancement of throughput and fairness in 4G wireless access systems by non-orthogonal signaling
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DOI：
10.1002/bltj.20336
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发表时间：
2009
影响因子：
--
通讯作者：
J. Schaepperle;A. Rüegg
中科院分区：
文献类型：
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作者：
J. Schaepperle;A. Rüegg
除了显著提高吞吐量，第四代(4G)蜂窝无线接入系统预计将具有成本效益，并即使在小区边缘也能提供足够的性能。本文提出了一种新的方法，称为径向空分多址(RDMA)，可以在不增加天线数量的情况下显著提高系统的频谱效率，并在不需要基站之间快速骨干通信和同步的情况下提供用户之间的公平性。其基本思想是通过不仅利用空间的角度维度(如在空分多址(SDMA)中)，而且利用径向维度来逼近公平约束下的多用户信道的容量。使用用于在相同无线电资源上同时传输多个信号的非正交信令和接收器中的联合检测。利用仅需要长期信道统计并且在发射机处不需要瞬时信道状态信息的低复杂性方法，实现了显著的吞吐量增益。在IEEE 802.16/全球微波接入互操作性(WiMAX)系统向802.16m演进的背景下，详细的链路和第一个简单的系统级仿真结果表明，在不需要更先进的模拟硬件或增加带宽或发射功率的情况下，系统吞吐量可以翻一番。
Besides having significantly enhanced throughput, fourth generation (4G) cellular wireless access systems are expected to be cost efficient and provide sufficient performance even at the cell edge. This paper proposes a new method, called radial space-division multiple access (RDMA) for improving the system's spectral efficiency significantly and providing fairness among users without increasing the number of antennas and without requiring fast backbone communication and synchronization between base stations. The basic idea is to approach the capacity of the multi-user channel under fairness constraints by exploiting not only the angular dimension of space, as in space-division multiple access (SDMA), but also the radial dimension. Non-orthogonal signaling for simultaneous transmission of multiple signals over the same radio resource and joint detection in the receiver are used. Significant throughput gains are achieved with low complexity methods requiring only long term channel statistics and no instantaneous channel state information at the transmitter. Detailed link and first simple system-level simulation results in the context of the evolution of IEEE 802.16/Worldwide Interoperability for Microwave Access (WiMAX) systems towards 802.16m show that system throughput can be doubled without requiring more advanced analog hardware or increasing bandwidth or transmit power.