High-Speed Satellite Mobile Communications: Technologies and Challenges

Ibnkahla, Mohamed; Rahman, Quazi Mehbubar; Sulyman, Ahmed Iyanda; Alasady, H.; Yuan, Jun; Safwat, Ahmed M.

doi:10.1109/jproc.2003.821907

Cited by 134 publications

(64 citation statements)

References 115 publications

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“…Minimum elevation angle is the common constraint in traditional analysis, and a point is covered by a satellite if the local elevation angle is greater than the specified minimum value. However, in terms of LEO satellites offering highspeed data communication service, Ku, Ka or even higher frequency is used which leads to greater attenuation of space link [6,8]. Then high-gain antenna is on demand to compensate for the attenuation.…”

Section: Single Coveragementioning

confidence: 99%

“…Traditional methods and results are based on the constraint of a lower minimum elevation angle because the coverage region of single satellite is large enough [5]. However, to transmit high-speed and broadband signals, satellites are equipped with narrow-beamwidth antennas which limit the coverage of single satellite [6]. Then the satellite amount can be extremely large such as OneWeb and SpaceX satellite constellations.…”

Section: Introductionmentioning

confidence: 99%

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Design of LEO Constellations Providing Internet Services Based on SOC Method

et al. 2017

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Abstract. Narrow-beamwidth antenna is applied to LEO satellite constellations to provide high-speed internet services for the globe. Low-altitude, limited coverage region of single satellite and large scale are the main features of them. In this paper, under the constraint of specified half-beam angle of antenna, both inclined and polar orbit constellations are analysed based on Streets-of-Coverage method to provide continuous coverage. The results indicate that the coverage performance of single satellite is the key factor which can affect the configuration and number of constellations. When the orbit altitude is 1200 km and half-beam angle is 32 degrees, up to thousands of satellites are required for constellations providing internet services for zonal region 60 degrees from the equator. Non-symmetrical polar constellations show the best performance of continuous coverage and require approximately half of the satellites of inclined orbit constellations. The required satellites with different single coverage performance are also investigated as a reference for future research.

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Section: Single Coveragementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of LEO Constellations Providing Internet Services Based on SOC Method

et al. 2017

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“…Compared to the two-hop connection in BP systems, single-hop connection decreases the one-way transmission delay from 540 to 270 ms, which provides more comfortable user experience. The enhanced performance by OBP can be used to reduce the cost of small earth stations [3] or increase the system capacity.…”

Section: Introductionmentioning

confidence: 99%

“…The OBP directly related to communications can be roughly divided into two classes: intermediate/radio frequency (IF/RF) processing and switching and baseband OBP [2,3]. The IF/RF processing and switching is actually the digital channelization technique [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Baseband OBP is commonly referred as fully processing satellite platform, so all the physical layer techniques, including demodulation/modulation, decoding/encoding and channel estimation/equalization, should be performed for the signal regeneration for each subchannel [3,14]. The Thuraya system is a good example of current satellite communication systems with baseband OBP platform [9].…”

Section: Introductionmentioning

confidence: 99%

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Residue code based low cost SEU-tolerant fir filter design for OBP satellite communication systems

Yang

Gao

Chen

et al. 2012

J Wireless Com Network

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With the development of satellite communications, on-board processing (OBP) obtains more and more attentions due to the increased efficiency and performance. However, the large amounts of digital circuits in the OBP transponders are sensitive to the high-energy particles in space radiation environments, which may cause various kinds of single event effect. Among these effects, single event upset (SEU) is the major potential reason for the instability of the satellite communication systems. Triple modular redundancy (TMR) is a classical and effective method for mitigating the SEU in digital circuits. However, since three identical logic modules and a voting circuit are needed in TMR, the overhead is so high that the scheme may not be applicable on the on-board digital processing platform with very limited area and power resources. Therefore, how to design a more cost-effective fault-tolerant method becomes a critical issue. Considering that FIR-like processing is frequently used on OBP platform, in this article, a dual modules (DM) plus checking module based on residue code (DM-CRC) architecture for SEU-tolerant FIR design is proposed. Although this architecture reduces the area overhead dramatically, we find that the fault missing rate is still high if single-sample checking (SSC) is used. To solve this problem, a Multi-sample checking DM-CRC (MSC-DM-CRC) is further proposed. Our analysis shows that the MSC-DM-CRC scheme can make the fault missing rate small enough without reducing the actual throughput. By simulations it is shown that, when the modulus for CRC is 7 and the number of samples for MSC is 4, the reduction of area overhead relative to TMR is over 20% and the fault missing rate is as low as 0.05%.

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Analytical and Adaptive Modeling of Nonlinear High Power Amplifiers

Ibnkahla

2005

Encyclopedia of RF and Microwave Engineering

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High‐power amplifiers are used in modern communication systems for their high‐power efficiency. However, these amplifiers have generally nonlinear characteristics, leading to signal distortion and adjacent channel interference. We review the most popular analytical models for these nonlinear characteristics. A special focus is given to adaptive models—mainly neural network approaches—which have emerged as efficient tools for the modeling, identification, and characterization of nonlinear amplifiers.

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High-Speed Satellite Mobile Communications: Technologies and Challenges

Cited by 134 publications

References 115 publications

Design of LEO Constellations Providing Internet Services Based on SOC Method

Design of LEO Constellations Providing Internet Services Based on SOC Method

Residue code based low cost SEU-tolerant fir filter design for OBP satellite communication systems

Analytical and Adaptive Modeling of Nonlinear High Power Amplifiers

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