Performance and design of SIC receiver for downlink NOMA with open-loop SU-MIMO
Performance and design of SIC receiver for downlink NOMA with open-loop SU-MIMO
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DOI：
10.1109/iccw.2015.7247334
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发表时间：
2015-06
期刊：
影响因子：
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通讯作者：
Keisuke Saito;A. Benjebbour;Y. Kishiyama;Y. Okumura;Takehiro Nakamura
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文献类型：
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作者：
Keisuke Saito;A. Benjebbour;Y. Kishiyama;Y. Okumura;Takehiro Nakamura
本文研究了下行链路非正交多址接入 (NOMA) 与 2×2 开环单用户 (SU)-MIMO 相结合的连续干扰消除 (SIC) 接收机的性能和设计。与具有 1×2 SIMO（单输入多输出）的 NOMA 相比，对于具有 2×2 SU-MIMO 的 NOMA，我们必须在每个用户的接收器处处理用户间和流间干扰。因此，我们根据用户设备（UE）之间的传输秩组合，在SIC之前和SIC之后引入不同的权重生成方案，同时考虑用户间干扰。此外，我们还比较了不同SIC接收器的性能；具体来说，码字级SIC（CWIC）、符号级SIC（SLIC）和理想SIC。假设LTE（长期演进）传输模式3（TM3），在不同分配的发射功率、秩组合以及调制和编码方案（MCS）下进行链路级仿真。链路级仿真结果表明，当小区中心UE功率比低于0.35、小区中心UE和小区边缘UE的MCS分别为16QAM（R = 0.49）和QPSK（R = 0.49）时，CWIC接收器比SLIC实现了更高的性能，并且与理想SIC几乎相同的性能。
This paper investigates the performance and design of successive interference cancellation (SIC) receiver for downlink non-orthogonal multiple access (NOMA) combined with 2-by-2 open-loop single-user (SU)-MIMO. Compared to NOMA with 1-by-2 SIMO (Single Input Multiple Output), for NOMA with 2-by-2 SU-MIMO we have to deal with both inter-user and interstream interference at the receiver of each user. Therefore, we introduce different weight generation schemes for both before SIC and after SIC according to the transmission rank combination between the user equipment (UEs), while taking into account inter-user interference. In addition, we compare the performance of different SIC receivers; specifically, codeword level SIC (CWIC), symbol level SIC (SLIC), and ideal SIC. Assuming LTE (Long Term Evolution) Transmission Mode 3 (TM3), link-level simulations are conducted under different allocated transmit powers, rank combinations, and modulation and coding schemes (MCS). The link-level simulation results showed that the CWIC receiver achieves higher performance compared to SLIC and achieves almost the same performance compared to ideal SIC when the power ratio of cell-center UE is below 0.35, and the MCS of cell-center UE and cell-edge UE are 16QAM (R = 0.49) and QPSK (R = 0.49), respectively.