A New Design of Hybrid SIC for Improving Transmission Robustness in Uplink NOMA

A Rate Splitting Strategy for Uplink CR-NOMA Systems

“…We assume that the channels follow a statistical fading. In addition, we assume the same channel state information (CSI) acquisition procedure as that in [4].…”

“…Under the quality of service (QoS) oriented criterion, the users with more stringent QoS requirements are decoded first, while the others are decoded in the remaining stages of the SIC [2]- [4]. Under the channel state information (CSI) based criterion, the users with the better CSI are firstly decoded before decoding the users with the worse CSI [1], [5]- [7].…”

“…Fortunately, the recently proposed QoS-guaranteed SIC (QoS-SIC) scheme in [2] and [3] avoids the outage probability error floor to some extent by adopting a hybrid decoding order taking into account both the CSI and QoS requirements for deciding the users' priorities in SIC. Furthermore, a new hybrid SIC (NH-SIC) scheme was proposed in [4], which introduced the power control (PC) to increase the achievable rate. Compared to the QoS-SIC scheme, the NH-SIC scheme relieves the restriction on the target rate values and improves the outage performance [3], [4].…”

“…Furthermore, a new hybrid SIC (NH-SIC) scheme was proposed in [4], which introduced the power control (PC) to increase the achievable rate. Compared to the QoS-SIC scheme, the NH-SIC scheme relieves the restriction on the target rate values and improves the outage performance [3], [4].…”

“…The proposed RS scheme allocates the transmit power to the split data streams most efficiently in a CR inspired way and benefits from the advantage of the RS for achieving the capacity region of MACs, which results in the best outage performance for the considered system. To clarify the advantage of the proposed RS scheme, we carry out comprehensive analysis and provide detailed comparisons over the existing schemes [3], [4].…”