Distributed Rate Control in Downlink NOMA Networks With Reliability Constraints

Autor: Hirley Alves, Onel L. Alcaraz López, Matti Latva-aho
Rok vydání: 2019
Předmět:
Signal Processing (eess.SP)
FOS: Computer and information sciences
Mathematical optimization
Computer science
Computer Science - Information Theory
Reliability (computer networking)
reliability constraints
050801 communication & media studies
02 engineering and technology
Interference (wave propagation)
Computer Science - Networking and Internet Architecture
Noma
0508 media and communications
Telecommunications link
FOS: Electrical engineering
electronic engineering
information engineering
0202 electrical engineering
electronic engineering
information engineering
medicine
Wireless
Electrical Engineering and Systems Science - Signal Processing
Electrical and Electronic Engineering
rate control
Networking and Internet Architecture (cs.NI)
business.industry
Information Theory (cs.IT)
Applied Mathematics
05 social sciences
NOMA
020206 networking & telecommunications
Spectral efficiency
power allocation
medicine.disease
Computer Science Applications
Power (physics)
Constraint (information theory)
optimal user ordering
business
Zdroj: IEEE Transactions on Wireless Communications. 18:5410-5423
ISSN: 1558-2248
1536-1276
DOI: 10.1109/twc.2019.2936188
Popis: Non-orthogonal multiple access (NOMA) has been identified as a promising technology for future wireless systems due to its performance gains in spectral efficiency when compared to conventional orthogonal schemes (OMA). This gain can be easily translated to an increasing number of served users, but imposes a challenge in the system reliability which is of vital importance for new services and applications of coming cellular systems. To cope with these issues we propose a NOMA rate control strategy that makes use only of topological characteristics of the scenario and the reliability constraint. We attain the necessary conditions so that NOMA overcomes the OMA alternative, while we discuss the optimum allocation strategies for the 2-user NOMA setup when operating with equal rate or maximum sum-rate goals. In such scenario we show that the user with the largest target error probability times the ratio between the average receive signal power and the average interference power, should be scheduled to be decoded first for optimum performance. We compare numerically the performance of our allocation scheme with its ideal counterpart requiring full CSI at the BSs and infinitely long blocklength, and show how the gap increases as the reliability constraint becomes more stringent. Results also evidence the benefits of NOMA when the co-interference can be efficiently canceled, specially when the goal is to maximize the sum-rate.
14 pages, 10 figures, accepted at IEEE TWC
Databáze: OpenAIRE
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