Performance of Non-orthogonal Multiple Access With a Novel Asynchronous Interference Cancellation Technique

Abstract

The non-orthogonal multiple access (NOMA) allows one subcarrier to be allocated to more than one user at the same time in an orthogonal frequency division multiplexing (OFDM) system. NOMA is a promising technique to provide high throughput due to frequency reuse within a cell. In this paper, a novel interference cancellation (IC) technique is proposed for asynchronous NOMA systems. The proposed IC technique exploits a triangular pattern to perform the IC from all interfering users for the desired user. The bit error rate (BER) and capacity performance analysis of an uplink NOMA system with the proposed IC technique is presented, along with the comparison to orthogonal frequency division multiple access (OFDMA) systems. The numerical and simulation results show that the NOMA with the proposed asynchronous IC technique outperforms the OFDMA. It is also shown that employing iterative IC provides significant performance gain for NOMA and the number of required iterations depends on the modulation level and the detection method. With hard-decision, two iterations are sufficient, however with soft-decision, two iterations are enough only for low modulation level, and more iterations are desirable for high modulation level.

Modeling and Analysis of Two-Way Relay Non-Orthogonal Multiple Access Systems

“…Considering the secrecy issues of NOMA against external eavesdroppers, the authors in [9] investigated secrecy outage behaviors of NOMA in largerscale networks for both single-antenna and multiple-antenna transmission scenarios. Explicit insights for understanding the asynchronous NOMA, a novel interference cancellation scheme was proposed in [10], where the bit error rate and throughput performance were analyzed. By the virtue of available CSI, the performance of NOMA based multicast cognitive radio scheme (MCR-NOMA) was evaluated [11], in which outage probability and diversity order are obtained for both secondary and primary networks.…”

Extending the user capacity of MU-MIMO systems with low detection complexity and receive diversity

“…Modulation Mapping On the other hand, a balance between spectral efficiency and fairness in distributing the system resources among active users should be maintained for future communications [11,22]. Motivated by these facts, user partitioning is considered in this work by dividing the allowed users into two groups based on their relative proximity from BS represented by the path loss and channel gain conditions as:…”

“…On different directions, user overloading based on users grouping to share the same DoF has been investigated in [22][23][24][25][26][27] for different multiple-access schemes. In [22], non-orthogonal multiple-access (NOMA) is proposed to allow simultaneous transmission of more than one user for each subcarrier in orthogonal frequency division multiplexing (OFDM) system with efficient interference cancellation technique.…”

“…In [22], non-orthogonal multiple-access (NOMA) is proposed to allow simultaneous transmission of more than one user for each subcarrier in orthogonal frequency division multiplexing (OFDM) system with efficient interference cancellation technique. In [23], more users than the spreading factors of orthogonal code division multiple-access (OCDMA) are accommodated though at the cost of higher signal-to-noise ratio (SNR).…”

Minimum Power Scheduling under Rician Fading in Full-Duplex Relay-Assisted D2D Communication

“…Among these techniques, Non-Orthogonal Multiple Access (NOMA) differentiates from traditional orthogonal multiple access (OMA) schemes, permitting users to share the same resource (time/frequency/code), exploiting different channel power levels [1]. NOMA transmissions adopt superposition coding, while at the reception Successive Interference Cancellation (SIC) is employed, decoding first the strongest signal and then, subtracting it, in order to decode the desired signal with minimum interference [2]. The survey in [3] presents various challenges of NOMA, including the need for dynamic user pairing, as users must be divided in groups that are allocated different channels to perform NOMA, while the potential of NOMA for increasing the resource efficiency was underlined.…”