Edge Users Spectrum Efficiency Maximization Using Spatially Aligned Carrier Aggregated NOMA in Dense Multi-Cell Networks

IF 7.1 2区计算机科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Vehicular Technology Pub Date : 2024-12-12 DOI:10.1109/TVT.2024.3514671

Muhammad Saleem Khan;Sobia Jangsher;Hassaan Khaliq Qureshi;Syed Ali Hassan;Shahid Mumtaz;Arafat Al-Dweik

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Abstract

This article studies a novel spatially aligned carrier aggregated non-orthogonal multiple access (SACA-NOMA) scheme for spectrum distribution and fair power allocation among grouped users. The proposed SACA-NOMA scheme integrates NOMA, carrier aggregation (CA) and joint transmission coordinated multipoint (JT-CoMP). It uses spatial differentiation between multiple NOMA pairs to combat interference. The main objective of the scheme is to maximize the spectral efficiency and quality of service (QoS) of cell-edge users by grouping them with multiple NOMA pairs. NOMA on top of CA assisted JT-CoMP is a promising contender for next-generation cellular networks because it can address the issues of spectrum scarcity and edge-user QoS. Two challenges arise from this integration when NOMA pairs are grouped with cell-edge user. Among these include an increase in interference at cell-edge user and complexity of implementing successive interference cancellation. These challenges can be addressed by exploiting the additional spatial domain. Base stations can cooperate to achieve interference alignment at cell-edge users through zero-forcing pre-coding. Similarly, a grouping scheme is presented wherein number of users in NOMA based pairing never exceeds two on any spatial axis. To this end, we formulated a joint problem of spectrum allocation, power control and BS's admission control into proposed scheme, with an aim to enhance the spectral efficiency of edge users. A fair power allocation and admission control algorithm is developed to solve the mixed integer non-linear fractional problem. The obtained numerical results show that the proposed SACA-NOMA scheme offers the cell-edge users a significant performance gain of about 60% and 300% when compared to the multi-cell hybrid NOMA-OMA and single cell OMA schemes, respectively. The proposed scheme is also validated for a typical macro-cell in an urban environment.

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在密集多蜂窝网络中使用空间排列载波聚合 NOMA 实现边缘用户频谱效率最大化

研究了一种新的空间对准载波聚合非正交多址（SACA-NOMA）方案，用于分组用户间的频谱分配和功率公平分配。提出的SACA-NOMA方案集成了NOMA、载波聚合（CA）和联合传输协调多点（JT-CoMP）。它利用多个NOMA对之间的空间分异来对抗干扰。该方案的主要目标是通过将蜂窝边缘用户分组为多个NOMA对，最大限度地提高频谱效率和服务质量（QoS）。基于CA辅助JT-CoMP的NOMA是下一代蜂窝网络的有力竞争者，因为它可以解决频谱稀缺和边缘用户QoS问题。当NOMA对与蜂窝边缘用户分组时，这种集成产生了两个挑战。其中包括蜂窝边缘用户的干扰增加和实现连续干扰消除的复杂性。这些挑战可以通过利用额外的空间域来解决。通过强制零预编码，基站可以协同实现对蜂窝边缘用户的干扰对准。同样，提出了一种分组方案，其中基于NOMA配对的用户数量在任何空间轴上都不超过两个。为此，我们在方案中提出了频谱分配、功率控制和BS准入控制的联合问题，以提高边缘用户的频谱效率。针对混合整数非线性分数阶问题，提出了一种公平的功率分配与准入控制算法。数值计算结果表明，与多小区混合NOMA-OMA和单小区OMA方案相比，所提出的SACA-NOMA方案可为蜂窝边缘用户提供约60%和300%的显著性能增益。该方案还在城市环境中的典型宏细胞中得到了验证。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Vehicular Technology 工程技术-电信学

CiteScore

6.00

自引率

8.80%

发文量

1245

审稿时长

6.3 months

期刊介绍： The scope of the Transactions is threefold (which was approved by the IEEE Periodicals Committee in 1967) and is published on the journal website as follows: Communications: The use of mobile radio on land, sea, and air, including cellular radio, two-way radio, and one-way radio, with applications to dispatch and control vehicles, mobile radiotelephone, radio paging, and status monitoring and reporting. Related areas include spectrum usage, component radio equipment such as cavities and antennas, compute control for radio systems, digital modulation and transmission techniques, mobile radio circuit design, radio propagation for vehicular communications, effects of ignition noise and radio frequency interference, and consideration of the vehicle as part of the radio operating environment. Transportation Systems: The use of electronic technology for the control of ground transportation systems including, but not limited to, traffic aid systems; traffic control systems; automatic vehicle identification, location, and monitoring systems; automated transport systems, with single and multiple vehicle control; and moving walkways or people-movers. Vehicular Electronics: The use of electronic or electrical components and systems for control, propulsion, or auxiliary functions, including but not limited to, electronic controls for engineer, drive train, convenience, safety, and other vehicle systems; sensors, actuators, and microprocessors for onboard use; electronic fuel control systems; vehicle electrical components and systems collision avoidance systems; electromagnetic compatibility in the vehicle environment; and electric vehicles and controls.