Abstract
In most existing works on non-orthogonal multiple access (NOMA), the decoding order of successive interference cancellation (SIC) is prefixed and based on either the users' channel conditions or their quality of service (QoS) requirements. A recent work on NOMA assisted semi-grant-free transmission showed that the use of a more sophisticated hybrid SIC scheme can yield significant performance improvements. This letter illustrates how the concept of hybrid SIC can be generalized and applied to different NOMA applications. We first use NOMA assisted mobile edge computing (MEC) as an example to illustrate the benefits of hybrid SIC, where new results for offloading energy minimization are presented. Then, future directions for generalizing hybrid SIC with adaptive decoding order selection as well as its promising applications are discussed.
Highlights
S UCCESSIVE interference cancellation (SIC) is a key component of non-orthogonal multiple access (NOMA) systems, and is crucial for the performance of NOMA transmission [1]–[3]
In the first part of this letter, the recent work in [5] on a hybrid implementation of channel state information (CSI)- and quality of service (QoS)-based successive interference cancellation (SIC) has been reviewed, where we showed that adaptively switching between CSI- and QoSbased SIC can avoid an outage probability error floor, which is inevitable with either of the two individual schemes
A hybrid SIC based optimal solution for offloading energy minimization was obtained and its superior performance compared to benchmark schemes was demonstrated
Summary
S UCCESSIVE interference cancellation (SIC) is a key component of non-orthogonal multiple access (NOMA) systems, and is crucial for the performance of NOMA transmission [1]–[3]. In the first part of this two-part invited letter, we have explained that, in most existing works on NOMA, the design of the SIC decoding order is prefixed and based on either the users’ channel state information (CSI) or their quality of service (QoS) requirements [2]–[4]. This is primarily due to the general perception that the use of more than one SIC decoding orders is trivial and unnecessary. Future directions for the design of sophisticated SIC schemes as well as promising applications in different NOMA communication scenarios are presented
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