Efficient Transmitter and Receiver Designs for SC-FDMA Based Heterogeneous Networks
Efficient Transmitter and Receiver Designs for SC-FDMA Based Heterogeneous Networks
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DOI：
10.1109/tcomm.2015.2434383
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发表时间：
2015-05
影响因子：
8.3
通讯作者：
Daniel Castanheira;Adão Silva;R. Dinis;A. Gameiro
中科院分区：
文献类型：
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作者：
Daniel Castanheira;Adão Silva;R. Dinis;A. Gameiro
在本文中，我们考虑了基于单载波频分多址(SC-FDMA)系统的上行链路，其中一组小小区与使用相同频谱的宏小区共存。为了同时处理载波间干扰(ICI)和系统间干扰，我们在小小区发送端结合了干扰对齐(IA)预编码和宏接收端的迭代判决反馈均衡。发射机和接收机的设计同时考虑了宏蜂窝和小蜂窝之间的完全协调和有限的系统间信息交换。在小小区方面，我们假设接入点通过有限容量的回程网络连接到中央单元，在那里执行小小区信号的量化版本的分离。对于这种情况，迭代反馈均衡器是通过显式考虑信号量化的影响来设计的。此外，还给出了所提出方案的性能的半解析方法。结果表明，该方案对系统间干扰和载波间干扰均具有较强的鲁棒性，能够在有限信息交换的情况下有效分离宏小区和小小区空间流。
In this manuscript, we consider the uplink of a single carrier frequency division multiple access (SC-FDMA) based system, where a set of small-cells coexist with a macro-cell using the same spectrum. To deal with both the inter-carrier interference (ICI) and inter-system interference, we combine interference alignment (IA) precoding at the small-cell transmitters with iterative decision feedback equalization at the macro-receiver. The transmitter and receiver design is performed jointly by considering both full-coordination and limited inter-system information exchange between macro- and small-cells. At the small cells side, we assume that the access points are connected through a limited capacity backhaul network to a central unit, where the separation of a quantized version of the small-cell signals is performed. For this case, the iterative feedback equalizer is designed by explicitly taking into account the impact of signal quantization. Moreover, a semi-analytical approach for the performance of the proposed schemes is provided. The results show that the proposed schemes are robust to both inter-system and inter-carrier interferences and thus are able to efficiently separate the macro- and small-cells spatial streams under limited information exchange.