Interference Modeling and Analysis for Inclined Projective Multiple Beams of GEO Satellite Communication Systems

2012 ◽  
Author(s):  
Wei Zheng ◽  
Shubo Ren ◽  
Jiang Chen ◽  
Jianjun Wu
Keyword(s):  
Communication Systems ◽  
Satellite Communication ◽  
Modeling And Analysis ◽  
Interference Modeling ◽  
Geo Satellite ◽  
Multiple Beams

Interference Modeling and Analysis for Inclined Projective Multiple Beams of GEO Satellite Communication Systems

2013 ◽  
Vol 756-759 ◽  
pp. 1204-1209 ◽  
Author(s):  
Wei Zheng ◽  
Bin Li ◽  
Shu Bo Ren ◽  
Jiang Chen ◽  
Jian Jun Wu
Keyword(s):  
System Performance ◽  
Communication Systems ◽  
Satellite Communication ◽  
Power Ratio ◽  
Interference Power ◽  
Coverage Area ◽  
Modeling And Analysis ◽  
Satellite Systems ◽  
Geo Satellite ◽  
Multiple Beams

In multi-beam satellite systems, Inter-Beam Interference (IBI) has a great effect on system performance. Within range of satellite coverage area, inclined projective multiple beams give rise to elliptic beam projections, resulting in that the distribution of beam projections is different from traditional cellular distribution. In this paper, an Inclined Projection (IP) model is proposed for IBI in OFDMA based GEO satellite communication systems, and corresponding analysis is also included. A comparison of carrier to interference power ratio (C/I) of users at the center of each cell with and without the consideration of IP is made, based on the simulation using different Frequency Reuse (FR) factor. The corresponding conclusions are presented. This research can provide reference for later satellite beam planning.

Forced-Retransmission Based Hybrid HARQ Scheme for GEO Satellite Communications

2013 ◽  
Vol 846-847 ◽  
pp. 651-654
Author(s):  
Ya Dan Zheng ◽  
Jian Bo Li ◽  
Yong Luo ◽  
Ming Ke Dong ◽  
Jian Jun Wu
Keyword(s):  
Communication System ◽  
Communication Systems ◽  
Satellite Communication ◽  
Satellite Communications ◽  
Hybrid Scheme ◽  
Satellite Communication System ◽  
Geo Satellite ◽  
Simulation Results

In this paper, a hybrid HARQ scheme was proposed by combing forced retransmission and traditional HARQ together, after analyzing the characteristics of satellite channel and the problem encountered when utilizing HARQ scheme in GEO satellite communication system. The forced retransmission can make a packet be correctly decoded more quickly and shorten the waiting delay. Meanwhile, to balance the delay and throughput, the proper parameters were given for the proposed hybrid scheme. Simulation results show that the proposed scheme performs well at decreasing the waiting delay, especially when SNR is low. The conclusion can be drawn that the proposed scheme can improve the HARQ performance in GEO satellite communication systems.

scholarly journals Precoded Cluster Hopping for Multibeam GEO Satellite Communication Systems

2021 ◽  
Vol 1 ◽  
Author(s):  
Eva Lagunas ◽  
Mirza Golam Kibria ◽  
Hayder Al-Hraishawi ◽  
Nicola Maturo ◽  
Symeon Chatzinotas
Keyword(s):  
Communication Systems ◽  
Satellite Communication ◽  
Pattern Design ◽  
Design Decisions ◽  
Heterogeneous Demand ◽  
Time Space ◽  
Geo Satellite ◽  
Flexible Adaptation ◽  
The Impact ◽  
Cluster Design

Beam hopping (BH) and precoding are two trending technologies for high-throughput satellite (HTS) systems. While BH enables the flexible adaptation of the offered capacity to the heterogeneous demand, precoding aims at boosting the spectral efficiency. In this study, we consider an HTS system that employs BH in conjunction with precoding in an attempt to bring the benefits of both in one. In particular, we propose the concept of cluster hopping (CH), where a set of adjacent beams are simultaneously illuminated with the same frequency resource. On this line, we propose an efficient time–space illumination pattern design, where we determine the set of clusters that shall be illuminated simultaneously at each hopping event along with the dwelling time. The CH time–space illumination pattern design formulation is shown to be theoretically intractable due to the combinatorial nature of the problem and the impact of the actual illumination design on the resulting interference. For this, we make some design decisions on the beam–cluster design that open the door to a less complex still well-performing solution. Supporting results based on numerical simulations are provided which validate the effectiveness of the proposed CH concept and a time–space illumination pattern design with respect to benchmark schemes.

scholarly journals A traffic-awareness dynamic resource allocation scheme based on multi-objective optimization in multi-beam mobile satellite communication systems

2017 ◽  
Vol 13 (8) ◽  
pp. 155014771772355 ◽  
Author(s):  
YuanZhi He ◽  
YiZhen Jia ◽  
XuDong Zhong
Keyword(s):  
Resource Allocation ◽  
Communication Systems ◽  
Satellite Communication ◽  
Dynamic Resource Allocation ◽  
Multi Objective ◽  
Multi Objective Programming ◽  
Multiple Beams ◽  
Traffic Awareness ◽  
Dynamic Resource ◽  
Mobile Satellite

Mobile satellite communication systems play an important role in space information networks. They mostly operate at the L or S band and have multiple beams efficiently reusing the limited spectrum. Advanced technologies, such as beamforming, are used to generate numerous beams through multiple feeders, and each beam’s power allocation is correlated and constrained. Frequency reuse among multiple beams results in co-channel interference issue, which makes bandwidth allocation among multiple beams coupled. It is a challenging topic to optimize the resource allocation in the real-time service traffic. In this article, a new multi-objective programming scheme is used to solve the dynamic resource allocation problem, guaranteeing high quality-of-service for multiple services of different priorities. Since the dynamic resource allocation problem is formulated as NP-hard, a new traffic-aware dynamic resource allocation (TADRA) algorithm is proposed. This algorithm is proved to be optimal in terms of the Pareto-front under constraints of co-channel interference and onboard transmit power. Simulation results show that the trade-off is well balanced between the call completion ratio in high priority and the throughput for video and data services in medium and low priorities. Additionally, it is shown that the new multi-objective programming scheme, based on the traffic-awareness dynamic resource allocation algorithm, can rapidly achieve the Pareto-front solutions and reduce the computing complexity to a large extent.

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