Space Division Multiple Access (SDMA) applicable for Mobile Satellite Communications

Ilčev, Stojče Dimov

doi:10.1109/telsks.2011.6143206

Cited by 6 publications

(4 citation statements)

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“…Furthermore, an efficient transmission scheme for flexible multiple access to several small LEO satellites has been proposed in [156] based on a QoS-aware scheduler. Further, applying the SDMA scheme in mobile satellite communications is investigated in [157] taking into consideration the transmitting power and bandwidth to achieve efficient simultaneous communications among multiple mobile satellite users.…”

Section: Coordinated Accessmentioning

confidence: 99%

A Survey on Nongeostationary Satellite Systems: The Communication Perspective

Al-Hraishawi

Chougrani

Kisseleff

et al. 2023

IEEE Commun. Surv. Tutorials

106

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The next phase of satellite technology is being characterized by a new evolution in non-geostationary orbit (NGSO) satellites, which conveys exciting new communication capabilities to provide non-terrestrial connectivity solutions and to support a wide range of digital technologies from various industries. NGSO communication systems are known for a number of key features such as lower propagation delay, smaller size, and lower signal losses in comparison to the conventional geostationary orbit (GSO) satellites, which can potentially enable latency-critical applications to be provided through satellites. NGSO promises a substantial boost in communication speed and energy efficiency, and thus, tackling the main inhibiting factors of commercializing GSO satellites for broader utilization. The promised improvements of NGSO systems have motivated this paper to provide a comprehensive survey of the state-of-theart NGSO research focusing on the communication prospects, including physical layer and radio access technologies along with the networking aspects and the overall system features and architectures. Beyond this, there are still many NGSO deployment challenges to be addressed to ensure seamless integration not only with GSO systems but also with terrestrial networks. These unprecedented challenges are also discussed in this paper, including coexistence with GSO systems in terms of spectrum access and regulatory issues, satellite constellation and architecture designs, resource management problems, and user equipment requirements. Finally, we outline a set of innovative research directions and new opportunities for future NGSO research.

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Section: Coordinated Accessmentioning

confidence: 99%

A Survey on Nongeostationary Satellite Systems: The Communication Perspective

Al-Hraishawi

Chougrani

Kisseleff

et al. 2023

IEEE Commun. Surv. Tutorials

106

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“…CDMA was also present in the third generation (3G) alongside GSM systems-the latter based on a combination of FDMA and TDMA. Orthogonal frequency division multiple access (OFDMA) was present in the fourth (4G) and fifth generations (5G) [1,2] as well as space division multiple access (SDMA) [3]. Despite being used since the first generation of mobile networks, schemes based on orthogonal multiple access are limited to the amount of orthogonal resources.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Clustering of Users in Power Domain NOMA

Santos

Silveira

2023

Sensors

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By enabling multiple non-orthogonal transmissions, power domain non-orthogonal multiple access (PD-NOMA) potentially increases a system’s spectral efficiency. This technique can become an alternative for future generations of wireless communication networks. The efficiency of this method fundamentally depends on two previous processing steps: an appropriate grouping of users (transmission candidates) as a function of the channel gains and the choice of power levels that will be used to transmit each signal. Thus far, the solutions presented in the literature to address the problems of user clustering and power allocation do not consider the dynamics of communication systems, i.e., the temporal variation in the number of users and the channel conditions. In order to consider these dynamic characteristics in the clustering of users in NOMA systems, this work proposes a new clustering technique based on a modification of the DenStream evolutionary algorithm, chosen for its evolutionary capacity, noise robustness and online processing. We evaluated the performance of the proposed clustering technique considering, for simplicity, the use of an already widely known power allocation strategy called improved fractional strategy power allocation (IFSPA). The results show that the proposed clustering technique can follow the system dynamics, clustering all users and favoring the uniformity of the transmission rate between the clusters. Compared to orthogonal multiple access (OMA) systems, the proposed model’s gain was approximately 10%, obtained on a challenging communication scenario for NOMA systems since the channel model adopted does not favor a large difference in the channel gains between users.

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“…Compared with wireless radio frequency (RF) communication, optical wireless communication has high communication capacity, high directivity, strong electromagnetic interference resistance and small size antenna. At the same time, technologies such as beamforming and space division multiple access(SDMA) [1], [2], which have been widely used in fifth-generation(5G) systems, mark the future development of signals in the direction of concentration, directivity and mobility. The characteristics of energy concentration and high directivity of the optical signal itself show special advantages under this development trend.…”

Section: Introductionmentioning

confidence: 99%

Optical Adaptive Antenna Array for Multiuser Mobile Optical Communication

et al. 2019

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In this paper, an optical adaptive antenna array system for multiuser optical mobile communication is studied. A coherent signal source is embedded in a spherical optical phased cell array with an external spherical lens system. The system can predict the signal power of the receiving end according to the channel transfer matrix and perform power compensation when transmitting the signal. Correspondingly, a pure phase lossless desired light field recovery algorithm is proposed and used for space division multiple access and free power allocation of antenna array systems. A small-scale optical adaptive antenna array experimental system is built and tested with good performance and consistent with the expected results. INDEX TERMS Adaptive antenna array, optical mobile communication, phased cell array, space division multiplexing access, free power allocation.

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Space Division Multiple Access (SDMA) applicable for Mobile Satellite Communications

Cited by 6 publications

References 1 publication

A Survey on Nongeostationary Satellite Systems: The Communication Perspective

A Survey on Nongeostationary Satellite Systems: The Communication Perspective

Adaptive Clustering of Users in Power Domain NOMA

Optical Adaptive Antenna Array for Multiuser Mobile Optical Communication

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