Hybrid Nonorthogonal Multiple Access with Half and Full Duplex Cooperative Users

Zhiyuan Lin, Wei Chen
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Abstract

In order to achieve high spectral efficiency, considerable attention has been paid to full-duplex (FD) and non-orthogonal multiple access (NOMA) technologies in the past decades. When FD users and half-duplex (HD) users access to the base station simultaneously, however, the rate region is still unknown. In this paper, we investigate hybrid NOMA (H-NOMA) systems, where a multi-antenna FD base station serves both a FD user and a HD uplink user over the same frequency band. The base station adopts successive interference cancellation (SIC) to decode the uplink signals, while the FD user is capable of adopting SIC to decode and cancel the inter-user interference. Given fixed transmission power, the achievable rate region of the H-NOMA system is the convex hull of the union of the rate regions of two alternative schemes with and without SIC at the FD user. Specifically, we derive the explicit expression of the rate region and demonstrate the potential of the proposed switching methods via numerical results.
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半双工和全双工合作用户的混合非正交多址
为了实现更高的频谱效率,全双工(FD)和非正交多址(NOMA)技术在过去几十年中受到了广泛的关注。然而,当FD用户和半双工(HD)用户同时接入基站时,速率区域仍然是未知的。在本文中,我们研究了混合NOMA (H-NOMA)系统,其中多天线FD基站在同一频段上同时为FD用户和高清上行用户提供服务。基站采用逐次干扰抵消(SIC)对上行信号进行解码,FD用户可以采用逐次干扰抵消(SIC)对用户间干扰进行解码和消除。给定固定的传输功率,H-NOMA系统的可实现速率区域是FD用户处带SIC和不带SIC的两种备选方案速率区域联合的凸包。具体而言,我们推导了速率区域的显式表达式,并通过数值结果证明了所提出的开关方法的潜力。
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