科研之友
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摘要
Non-orthogonal multiple access (NOMA) employs new degrees of freedom for channel sharing, but requires sophisticated receivers and generates high computational complexity. It is important to design simple but effective NOMA receivers. User ranking greatly affects the reliability of NOMA. Recently, instantaneous signal power (ISP)-based ranking has been widely adopted by the receiver to determine the signal decoding order in NOMA. However, this ranking neglects the data rate requirement of each user, which poses a significant impact on the reliability of NOMA. This letter puts forward the concept of Relative ISP (RISP), defined as a form of ISP to target-data-rate (TDR) ratio. A new ranking scheme, namely RISP-based ranking, is proposed to improve ISP-based ranking to consider the TDR of each user when determining the signal decoding order. Analysis and simulations demonstrate a surprising outage performance gain realized by the proposed scheme, as it is designed based on channel gain and data rate requirement of each user, rather than purely considering channel gain.
