Iterative SIC receiver scheme for non-orthogonally superimposed signals on top of OFDMA

Ruegg, A.; Tarable, Alberto

doi:10.1109/pimrc.2010.5671952

“…Authors of [4,5,12,13] suggest the usage of combined (NOMA/OMA). In [12] partial-NOMA is introduced in a large two-user downlink network to provide throughput and reliability.…”

Section: A Brief Overview About Sic Algorithms In Noma Systemsmentioning

confidence: 99%

“…In [13] an iterative SIC receiver architecture with the pilot-and data-based channel estimation for efficient decoding of non-orthogonal superimposed signals was proposed. It was claimed that the non-orthogonal superposition concept on top of OFDMA is a promising technique to improve cell spectral efficiency.…”

Section: A Brief Overview About Sic Algorithms In Noma Systemsmentioning

confidence: 99%

See 1 more Smart Citation

NOMA Transmission Systems: Overview of SIC Design and New Findings

Estrello¹,

Ramos-Alarcon²,

Kontorovich³

2022

Multiplexing - Recent Advances and Novel Applications

0

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Non-Orthogonal Multiple Access (NOMA) has been recently proposed as a good alternative to meet 5G and beyond requirements in terms of high spectral efficiency, massive connectivity, and low latency. It has been demonstrated that the use of NOMA in downlink has superior performance in terms of throughput, whereas the use in uplink outperforms OMA techniques in terms of fairness. A distinctive feature of NOMA is the presence of excessive multiple-access interference due to the case of usage of power domain to multiplex signals, thus the functional implementation of NOMA implies Successive Interference Cancelation (SIC) to combat this interference. Therefore, SIC design becomes the main point in the effectiveness of NOMA systems. On the other hand, hybrid schemes, NOMA/OMA, have been recently proposed to reduce the drawbacks of pure NOMA systems. However, in these schemes, it becomes necessary to distinguish NOMA and OMA users. Cognitive Radio techniques turn to be a good option to effectively separate NOMA/OMA users as well as to distinguish NOMA users. In this chapter, a brief overview of NOMA techniques related to Cognitive Radio technology (CR-NOMA) and SIC design reported in the literature is presented. Also, new findings about NOMA/OMA users’ recognition are described.

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“…(see details at [1], [3], etc.). A brief overview of the works considered as most important [1][2][3][4][5][6][7][8][9][10][11][12] is presented in the following. As it can be inferred from [4]- [5], the SIC decoding order based on the CSI turns critical and can have important influence on the system's performance.…”

Section: Introductionmentioning

confidence: 99%

Comments on SIC design for SISO NOMA Systems over Doubly Selective Channels.

Kontorovich¹

2022

Preprint

1

0

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Non-orthogonal multiple access principle applied in power domain (power-domain NOMA) enhances spectrum efficiency and connectivity of mobile communication systems through sharing between Orthogonal Multiple Access (OMA) and other multiple users. It is the almost main current trend for research and standards for 5G and beyond. Spectrum sharing generates multi-users interference (Multiple Access Interference, MAI) which destroys orthogonality in OMA systems. Meanwhile the so-called Successive Interference Cancellation (SIC) techniques are used to suppress MAI and the Cognitive Radio (CR) principle (CR-NOMA) for decoding order for multiple users inspired effective SIC algorithms. The CR-NOMA principle is applied in the present material as well, but with significant changes for SIC design as for Doubly Selective channels. Due to the above reasons, two original SIC design methods are proposed hereafter following the CR-NOMA principle. Regarding to it the OMA signal (primary user) is decoded first using a Chaos-based quasi-optimum Extended Kalman Filter (EKF). The set of “secondary users” (multiusers) are proposed to be decoded secondly by the following two different methods: - Chaos-based EKF filters or , - Sequential m hypothesis testing. The proposed approach for SIC design is rather simple, fast and accurate for practical implementation.

show abstract

“…(see details at [1], [3], etc.). A brief overview of the works considered as most important [1][2][3][4][5][6][7][8][9][10][11][12] is presented in the following. As it can be inferred from [4]- [5], the SIC decoding order based on the CSI turns critical and can have important influence on the system's performance.…”

Section: Introductionmentioning

confidence: 99%

Comments on SIC design for SISO NOMA Systems over Doubly Selective Channels.

Kontorovich¹

2022

Preprint

0

View full text Add to dashboard Cite

Non-orthogonal multiple access principle applied in power domain (power-domain NOMA) enhances spectrum efficiency and connectivity of mobile communication systems through sharing between Orthogonal Multiple Access (OMA) and other multiple users. It is the almost main current trend for research and standards for 5G and beyond. Spectrum sharing generates multi-users interference (Multiple Access Interference, MAI) which destroys orthogonality in OMA systems. Meanwhile the so-called Successive Interference Cancellation (SIC) techniques are used to suppress MAI and the Cognitive Radio (CR) principle (CR-NOMA) for decoding order for multiple users inspired effective SIC algorithms. The CR-NOMA principle is applied in the present material as well, but with significant changes for SIC design as for Doubly Selective channels. Due to the above reasons, two original SIC design methods are proposed hereafter following the CR-NOMA principle. Regarding to it the OMA signal (primary user) is decoded first using a Chaos-based quasi-optimum Extended Kalman Filter (EKF). The set of “secondary users” (multiusers) are proposed to be decoded secondly by the following two different methods: - Chaos-based EKF filters or , - Sequential m hypothesis testing. The proposed approach for SIC design is rather simple, fast and accurate for practical implementation.

show abstract

Iterative SIC receiver scheme for non-orthogonally superimposed signals on top of OFDMA

Cited by 7 publications

References 11 publications

NOMA Transmission Systems: Overview of SIC Design and New Findings

NOMA Transmission Systems: Overview of SIC Design and New Findings

Comments on SIC design for SISO NOMA Systems over Doubly Selective Channels.

Comments on SIC design for SISO NOMA Systems over Doubly Selective Channels.

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