Channel estimation and detection for multibeam satellite communications

Chaouech, Helmi; Bouallègue, Ridha

doi:10.1109/apccas.2010.5775068

Cited by 14 publications

(10 citation statements)

References 5 publications

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“…. When q 1 = q 2 , the power control problem follows a PC1 fashion shown in (25) with the objective function R T q 2 p T m 1 ,n 2 ,q 2 + R T q 1 p T m 1 ,n 1 ,q 1 . In contrast, when q 1 = q 2 = q, this becomes a PC2-type problem as shown in (27) with the objective function R T q p T m 1 ,n 2 ,q , p T m 1 ,n 1 ,q .…”

Section: B Algorithm Designmentioning

confidence: 99%

“…Denote the solutions as p T * m 1 ,n 2 ,q 2 and p T * m 1 ,n * ,q * . If p T * m 1 ,n * ,q * + p T * m 1 ,n 2 ,q 2 ≤ p budget m 1 , then we naturally obtain the optimal solution of PC1; otherwise, we set p T m 1 ,n * ,q * = p budget m 1 −p T m 1 ,n 2 ,q 2 and substitute it into the original objective function of (25). The problem then becomes a maximization problem with one continuous variable, which can be easily solved by searching the extreme points.…”

Section: Appendix Cmentioning

confidence: 99%

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Ultra-Dense LEO: Integrating Terrestrial-Satellite Networks Into 5G and Beyond for Data Offloading

Zhang

Song

et al. 2019

IEEE Trans. Wireless Commun.

220

101

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In this paper, we propose a terrestrial-satellite network (TSN) architecture to integrate the ultradense low earth orbit (LEO) networks and the terrestrial networks to achieve efficient data offloading.In TSN, each ground user can access the network over C-band via a macro cell, a traditional small cell, or a LEO-backhauled small cell (LSC). Each LSC is then scheduled to upload the received data via multiple satellites over Ka-band. We aim to maximize the sum data rate and the number of accessed users while satisfying the varying backhaul capacity constraints jointly determined by the LEO satellite based backhaul links. The optimization problem is then decomposed into two closely connected subproblems and solved by our proposed matching algorithms. Simulation results show that the integrated network significantly outperforms the non-integrated ones in terms of the sum data rate. The influence of the traffic load and LEO constellation on the system performance is also discussed. the core network via the traditional backhaul and LEO-based backhaul, respectively. Benefited from the UD-LEO constellation, we assume that each TST is allowed to connect to multiple satellites simultaneously [8], [11], thereby improving the resilience to the frequent handover of satellites [12]. Deployed by the same operator, all cells share the same C-band frequency resources for terrestrial communications. Multiple TST-satellite backhaul links over Ka-band are scheduled for each LSC. The network aims to maximize the sum rate of all users and accommodate as many users as possible. Therefore, the user association and resource allocation of multiple cells should be optimized subject to the backhaul capacity constraint of each cell. At the same time, the backhaul capacity of each LSC also needs to be maximized via the satellite selection and resource allocation. Various techniques have been considered for traffic offloading in the heterogeneous networks, such as satellite access [13], [14], hybrid satellite-terrestrial relaying [15]-[17], deviceto-device (D2D) multi-cell interference management [18]-[20], and cloud radio access. In [13], the terrestrial-satellite backhaul network shares the Ka-band and the terrestrial wireless links deploy the hybrid analog-digital transmit beamforming to mitigate interference. In [14], a single satellite covers a large area and the integrated terrestrial-satellite networks perform the cloudbased resource allocation. In [15]-[17], a hybrid terrestrial-satellite network sharing the same spectrum has been considered where either the satellite serves as a relay for one terrestrial sourcedestination pair or a terrestrial node relayes for the satellite -user pair. The average symbol error rate has been derived and the analytical diversity order has been obtained. In [18], [19], the D2D underlaying dense network has been considered and a distributed algorithm has been proposed to cope with the strong intra-cell and inter-cell interference. In [20], energy-efficient user association and resource allocation has bee...

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Section: B Algorithm Designmentioning

confidence: 99%

Section: Appendix Cmentioning

confidence: 99%

Ultra-Dense LEO: Integrating Terrestrial-Satellite Networks Into 5G and Beyond for Data Offloading

Zhang

Song

et al. 2019

IEEE Trans. Wireless Commun.

220

101

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“…The problem of channel gain estimation of the shadowed mobile satellite links by using the pilot symbols is addressed in [19], [20]. In [21], the channel estimation and detection for multibeam satellite communications is proposed. However, to the best of our knowledge, channel estimation along with detection of symbols in hybrid satelliteterrestrial communication systems has not been considered in the literature yet.…”

Section: A Novelty Of the Present Ideamentioning

confidence: 99%

“…The SER of the considered generalized hybrid channels based AF scheme for M -PSK constellation can be calculated, by using (21) and [23,Eq. (22)].…”

Section: Calculation Of Sermentioning

confidence: 99%

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Channel Estimation and Detection in Hybrid Satellite–Terrestrial Communication Systems

Arti¹

2016

IEEE Trans. Veh. Technol.

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We address the problem of amplify-and-forward relaying in a hybrid satellite-terrestrial communication system with unknown channel gains. A masked destination earth station (ES) receives the signal forwarded by a relaying ES, i.e., from a terrestrial link. There is no direct transmission from the satellite to the destination ES. The satellite-relay ES (satellite link) and relay ES-destination ES (terrestrial link) links are assumed to follow the Shadowed-Rician fading and Nakagami-m fading, respectively. A scheme for channel estimation and detection of transmitted signal from the satellite to the destination ES is proposed. The terrestrial link is estimated separately while the cooperative hybrid link (satellite-relay-destination) is estimated jointly with the symbol detection. The average symbol error rates of the M -ary phase shift keying and M -ary quadrature amplitude modulation constellations are derived for the considered hybrid communication system. Moreover, we also derive the analytical diversity order of the considered system with estimated channel gains. It is shown by simulation and analysis that the estimation error does not affect the diversity order of the system. Further, the average and asymptotic capacity of the system is also derived by using the moment generating function approach. Index Terms-Amplify-and-forward protocol, cooperative diversity, hybrid satellite-terrestrial cooperative system, land mobile satellite (LMS) channel, M -ary phase-shift keying (M -PSK), M -ary quadrature amplitude modulation (M -QAM).

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