Successive Interference Cancellation for LDPC Coded Non-Orthogonal Multiple Access Systems

Yuan, Lei; Pan, Jie; Yang, Nan; Ding, Zhiguo; Yuan, Jinhong

doi:10.1109/tvt.2018.2831213

Cited by 23 publications

(12 citation statements)

References 14 publications

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“…Về cơ bản, NOMA được phân chia thành hai loại: NOMA miền mã và NOMA miền năng lượng. Yuan và các công sự đã đưa ra hệ thống NOMA với mã kiểm tra chẵn lẽ mật độ thấp (LDPC: Low Density Parity Check) 2 . Đồng thời, các tác giả đã khảo sát hiệu năng của hệ thống gồm 2 UE tại đầu thu với phương pháp tách tín hiệu dùng các phiên bản khác nhau của SIC.…”

Section: Giới Thiệuunclassified

Performance of non-orthogonal multiple access downlink system using the Log-Likelihood ratio

Dang

Ngo

Nguyen

2020

Sci. Tech. Dev. J. - Nat. Sci.

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Non-orthogonal multiple access (NOMA) is one of the potential technologies for fifth generation (5G) cellular networks. This technique can combine with other techniques such as Orthogonal Frequency Division Multiplexing (OFDM) and Multiple Input Multiple Output (MIMO). In NOMA downlink, signals from multiple users are superposed in time-frequency domain. Hence, NOMA systems have a larger throughput than orthogonal multiple access systems. There are several schemes for NOMA detection. The successive interference cancellation (SIC) is commonly used to decode desired signals at the receivers. Some NOMA schemes with SIC are ideal SIC, symbol-level SIC and codeword-level SIC. The previous studies showed that the log-likelihood ratio (LLR) has a performance as ideal SIC. In this paper, we derive the bit error rate for a NOMA downlink system with 2 users (UE) using LLR receiver. This study considers the system over a Rayleigh fading channel and the presence of Additive White Gaussian Noise. The closed-form equations have been proposed for each user with QPSK mapping. The simulation results show that the performance of the system is consistent with the proposed formula

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Section: Giới Thiệuunclassified

Performance of non-orthogonal multiple access downlink system using the Log-Likelihood ratio

Dang

Ngo

Nguyen

2020

Sci. Tech. Dev. J. - Nat. Sci.

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“…It has been reported in literature that scheduling high number of users (more than 2-3) in power domain NOMA in same resource block does not offer much gain despite prohibitively increasing the complexity of transmit signal processing, signaling overhead as well as realizing the successive interference canceler receiver in polynomial or exponential order [42]. Therefore, we limit this early investigating work to 2 user multiplexed system as in [43]- [45].…”

Section: Link Level Performance Analysis Of Noma-otfs Systemsmentioning

confidence: 99%

Non Orthogonal Multiple Access with Orthogonal Time Frequency Space Signal Transmission

Chatterjee,

Rangamgari,

Tiwari

et al. 2020

Preprint

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Orthogonal time frequency space (OTFS) is being pursued in recent times as a suitable wireless transmission technology for use in high mobility scenarios. In this work, we propose nonorthogonal multiple access (NOMA) based OTFS which may be called 'NOMA-OTFS' system and evaluate its performance from system level and link level perspective. The challenge lies in the fact that while OTFS transmission technology is known for its resilience to high mobility conditions, while NOMA is known to yield high spectral efficiency in low mobility scenarios in comparison to orthogonal multiple access (OMA). We present a minimum mean square error (MMSE)-successive interference cancellation (SIC) based receiver for NOMA-OTFS, for which we derive expression for symbol-wise post-processing SINR in order to evaluate system sum spectral efficiency (SE). We develop power allocation schemes to maximize the sum SE in the high-mobility version of NOMA. We further design a realizable codeword level SIC (CWIC) receiver using LDPC codes along with MMSE equalization for evaluating link level performance of such practical NOMA-OTFS system. The system level and link level performance of the proposed NOMA-OTFS system are compared against benchmark OMA-OTFS, OMA-orthogonal frequency division multiplexing (OMA-OFDM) and NOMA-OFDM schemes. From system-level performance evaluation, we observe interestingly that NOMA-OTFS provides higher system sum SE than OMA-OTFS. When compared to NOMA-OFDM, we find that outage SE of NOMA-OTFS is improved at the cost of decrease in mean SE. Whereas link-level results show that the developed CWIC based NOMA-OTFS receiver performs significantly better than NOMA-OFDM in terms of block error rate (BLER), goodput and throughout.

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“…With NOMA, the introduction of overlapped information at the transmitter may bring higher spectral efficiency, but it also causes the MAI problem. In the literature, SIC has been regarded as a promising way to eliminate the MAI [23], [24]. In NOMA systems, SIC can be also implemented at the receivers for multi-user detection.…”

Section: B Successive Interference Cancellationmentioning

confidence: 99%

Interference Hypergraph-Based 3D Matching Resource Allocation Protocol for NOMA-V2X Networks

et al. 2019

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Vehicle-to-everything (V2X) communications are regarded as the key technology in future vehicular networks due to its ability in providing efficient and reliable massive connections, improving traffic efficiency and safety, and supporting in-vehicle entertainment and working. Recently, non-orthogonal multiple access (NOMA), as a promising solution in the fifth-generation (5G) mobile communication systems, has drawn much attention because it can significantly improve the network throughput and lower the accessing and transmission latency to meet the quality-of-service (QoS) requirements of many 5G-enabled applications. Noticing these, in this paper, we consider a device-to-device (D2D)-enhanced V2X network, in which NOMA is introduced to increase the capacity. In our studied NOMA-V2X system, except for the NOMA-based intra-group resource reuse, the D2D-enabled resource sharing based on spatial reuse among all the V2X communication groups is also permitted through centralized resource management, leading to a significantly improved network performance but a more complicated and challenging interference scenario. In order to efficiently manage the interference and allocate the resource in the NOMA-V2X network, we create a weighted 3-partite interference hypergraph (IHG) to imitate the complex interference environment in our studied scenario. Then, with the help of this hypergraph, we make another step to put forward an IHG-based 3-dimensional matching (IHG-3DM) resource allocation protocol with a greedy 3DM algorithm and an iterative 3DM algorithm. As a consequence, the network throughput is significantly improved with the help of our proposed IHG-3DM resource allocation protocol for the investigated NOMAintegrated V2X communications, which is verified by the simulation results.

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Successive Interference Cancellation for LDPC Coded Non-Orthogonal Multiple Access Systems

Cited by 23 publications

References 14 publications

Performance of non-orthogonal multiple access downlink system using the Log-Likelihood ratio

Performance of non-orthogonal multiple access downlink system using the Log-Likelihood ratio

Non Orthogonal Multiple Access with Orthogonal Time Frequency Space Signal Transmission

Interference Hypergraph-Based 3D Matching Resource Allocation Protocol for NOMA-V2X Networks

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