8 research outputs found
Downlink Asynchronous Non-Orthogonal Multiple Access with Quantizer Optimization
In this letter, we study a two-user downlink asynchronous non-orthogonal
multiple access (ANOMA) with limited feedback. We employ the max-min criterion
for the power allocation and derive the closed-form expressions for the upper
and lower bounds of the max-min rate. It is demonstrated that ANOMA can achieve
the same or even higher average maxmin rate with a lower feedback rate compared
with NOMA. Moreover, we propose a quantizer optimization algorithm which
applies to both NOMA and ANOMA. Simulation results show that the optimized
quantizer significantly improves the average max-min rate compared with the
conventional uniform quantizer, especially in the scenario with a low feedback
rate
Signal Processing and Learning for Next Generation Multiple Access in 6G
Wireless communication systems to date primarily rely on the orthogonality of
resources to facilitate the design and implementation, from user access to data
transmission. Emerging applications and scenarios in the sixth generation (6G)
wireless systems will require massive connectivity and transmission of a deluge
of data, which calls for more flexibility in the design concept that goes
beyond orthogonality. Furthermore, recent advances in signal processing and
learning have attracted considerable attention, as they provide promising
approaches to various complex and previously intractable problems of signal
processing in many fields. This article provides an overview of research
efforts to date in the field of signal processing and learning for
next-generation multiple access, with an emphasis on massive random access and
non-orthogonal multiple access. The promising interplay with new technologies
and the challenges in learning-based NGMA are discussed
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Downlink Asynchronous Non-Orthogonal Multiple Access With Quantizer Optimization
In this letter, we study a two-user downlink asynchronous non-orthogonal
multiple access (ANOMA) with limited feedback. We employ the max-min criterion
for the power allocation and derive the closed-form expressions for the upper
and lower bounds of the max-min rate. It is demonstrated that ANOMA can achieve
the same or even higher average maxmin rate with a lower feedback rate compared
with NOMA. Moreover, we propose a quantizer optimization algorithm which
applies to both NOMA and ANOMA. Simulation results show that the optimized
quantizer significantly improves the average max-min rate compared with the
conventional uniform quantizer, especially in the scenario with a low feedback
rate
Recommended from our members