Adaptive antenna arrays for mobile satellite communications

Zooghby, A.H. El; Khamy, S. El; Christodoulou, C.G.

doi:10.1109/secon.1996.510084

Cited by 6 publications

(12 citation statements)

References 4 publications

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“…Table 1 illustrates the steps in the QRD-based SIC scheme. Lines (3-7) represent the successive interference cancellation process, where Q[․] is the demodulation of the zero-forcing solution obtained in line (4).…”

Section: -2-2 Qrd-based Successive Interference Cancellation (Qrd-bamentioning

confidence: 99%

“…As a consequence, the UL throughput can't be significantly increased, though some diversity gain can be achieved by the receive antennas of the base station (BS) using linear combiners [3]. Another option for increasing UL throughput is using spatial division multiple accesses (SDMA), where users are spatially identified based on their location [4]. In spite of the appreciable performance improvement by SDMA, it is always very sensitive to the location of the MSs and requires a high number of antennas to achieve the required performance.…”

Section: ⅰ Introductionmentioning

confidence: 99%

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Boosting the Uplink Throughput of OFDM Systems by Creating Resolvable Interference

Mohaisen¹,

Hui

Chang³

2011

Journal of electromagnetic engineering and science

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Multiple-input multiple-output with orthogonal frequency division multiplexing technology (MIMO-OFDM) is considered to be the ultimate solution for increasing system throughput and for enhancing communication reliability. In this paper, we propose to increase the uplink (UL) throughput by assigning the same UL resources to multiple single-antenna mobile stations. This leads to the loss of orthogonality among sub-carriers. Thus, at the base station (BS), MIMO-OFDM detection techniques are used to separate the streams of different users assigned the same UL resources. To obtain a realistic performance evaluation, different channel scenarios are applied with different correlation values among the antennas of the users. Simulation results show that the proposed MIMO-OFDM system linearly increases the uplink capacity of the OFDM system while maintaining a mobile station transmitter as simple as that used in a conventional OFDM system. For instance, when 4 users are assigned the same UL resources, the throughput of the proposed system is 3.07 times that achieved by a conventional single input single output OFDM system.

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Section: -2-2 Qrd-based Successive Interference Cancellation (Qrd-bamentioning

confidence: 99%

Section: ⅰ Introductionmentioning

confidence: 99%

Boosting the Uplink Throughput of OFDM Systems by Creating Resolvable Interference

Mohaisen¹,

Hui

Chang³

2011

Journal of electromagnetic engineering and science

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“…The number of cellular users is expected to reach nearly 2.5 billion by 2010 [2]. This continued growth and evolution in mobile usage is driven by data services.…”

Section: Cdma2000 1xev-do Systemmentioning

confidence: 99%

“…Each of these applications is associated with its own unique set of challenges, such as the channel in which the system operates, the propagation environment, sources of interference, and noise or jamming. In addition, the end goal for which the adaptive antenna is used affects the selection of the type of array, size, adaptive algorithms, and integration with other system components [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…As such, smart antennas techniques can complement 3G system and improve their performance by alleviating and reducing the degradation caused by the aforementioned factors. In fact, because of their nature, technologies such as HSDPA and 1xEV-DO can greatly benefit from smart antennas since any improvement in the SIR experienced by the users would directly translate to better throughput for individual users as well as increased sector throughput that can support higher capacities [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

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CDMA 1xEVDO System with Smart Antenna Array

Castañeda-Camacho

Carro

Lara-Rodriguez

et al. 2010

2010 IEEE 72nd Vehicular Technology Conference - Fall

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Smart antennas have received increasing interest due to its capability for improving the performance of wireless radio systems. In this work we studied the throughput maximization in a CDMA 1xEV-DO cellular system when a smart antenna array is implemented. We focus in the downlink of the CDMA cellular system and consider a packet data directsequence code division multiple access (DS-CDMA). We show that it is possible to obtain a significant increment in the throughput of the system due to the switched beam smart antenna array.Keywords-Smart antenna, CDMA 1xEV-DO and CDMA throughput.

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Metasurface based MIMO Microstrip Antenna with Reduced Mutual Coupling

2021

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In this thesis, a negative permeability (μ) metasurface is used to reduce the mutual coupling of a 2-port Multiple-Input Multiple-Output (MIMO) rectangular inset fed microstrip antenna.That was designed using the transmission model of analysis, simulated and optimized using CST microwave studio. The microstrip antenna that operates at the (5.9-6.1) GHz band is designed for 5G applications, at the extended 6 GHz band (5.925-7.125) GHz. The extended band was chosen because of its new additional spectrum, which results in less noise interference. Three metasurface wall based antenna designs and two metasurface superstrate based antenna designs are conducted. The metasurface wall based antenna designs are formulated by placing a metasurface wall vertically between the two radiating antenna elements. The metasurface superstrate based antenna designs are formulated by suspending a metasurface superstrate above the 2-port microstrip antenna. Both the metasurface wall and superstrate are made up metasurface unit cells, which are formulated by periodic split ring resonators printed on a FR-4 dielectric substrate. The metasurface cells are responsible for introducing a negative permeability medium, which converts the electromagnetic propagating waves into evanescent hence rejecting mutual coupling.In the first metasurface based antenna design, a single metasurface wall is vertically placed between the two microstrip antenna elements. A slight increase of 0.5 dB in mutual coupling is observed. In the second design, a double metasurface wall is vertically placed between the two antenna elements. A mutual coupling reduction of 11 dB is achieved. In the third design a triple metasurface wall is also placed between the two antenna elements, a mutual coupling reduction of 25 dB and up to 17 % bandwidth enhancement is achieved. In the fourth design a single metasurface superstrate is suspended above the 2-port microstrip antenna. A mutual coupling reduction of 32 dB is achieved. Lastly, in the fifth design a metasurface superstrate is also suspended above the 2-port microstrip antenna. A mutual coupling reduction of 22 dB, a 38% bandwidth enhancement and a 2.09 dB gain enhancement is achieved.

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Adaptive antenna arrays for mobile satellite communications

Cited by 6 publications

References 4 publications

Boosting the Uplink Throughput of OFDM Systems by Creating Resolvable Interference

Boosting the Uplink Throughput of OFDM Systems by Creating Resolvable Interference

CDMA 1xEVDO System with Smart Antenna Array

Metasurface based MIMO Microstrip Antenna with Reduced Mutual Coupling

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