Ergodic Channel Capacity Analysis of Downlink in the Hybrid Satellite-Terrestrial Cooperative System

In this paper, the ergodic channel capacity of the downlink is analyzed for a hybrid satellite-terrestrial cooperative system, which consists of a satellite (the source), a mobile terminal (the destination), and several gap fillers (the relays) located at the ground. The links between the satellite and the relays and the link between the satellite and the destination experience independent shadowed Rician fading, and the links between the relays and the destination experience Rayleigh fading. The maximal ratio combining technique is used at the destination to combine the direct signal received from the satellite and the relayed signals from relays with different cooperative protocols, namely amplify-and-forward (AF) and decode-and-forward (DF). The moment generating function (MGF)-based approach is adopted to derive the closed-form expressions of the ergodic downlink channel capacity of the hybrid satellite-terrestrial cooperative system. The numerical results are compared with Monte Carlo simulations and numerical results calculated with the existing analytical expressions. Comparison results show that the analytical expression derived with the MGF-based approach can achieve a higher accuracy in the low signal-to-noise ratio (SNR) regime for the single relay scenario, and significantly reduce the computational complexity with a little loss of accuracy for multiple relays scenario. On the other hand, the ergodic downlink channel capacity of the hybrid satellite-terrestrial DF cooperative system is generally higher than that of the AF cooperative system. Moreover, the ergodic channel capacity of the hybrid satellite-terrestrial cooperative system decreases as the number of participating relays increases, which can be overcome using the best relay selection strategy. In addition, the ergodic downlink channel capacity of the hybrid satellite-terrestrial cooperative system increases when the channel condition of the link between the satellite and the relay goes better, and is larger than that of the no relay land mobile satellite system when the transmitted SNR is below a certain value.

[1]  Oluwatobi Olabiyi,et al.  ASER Analysis of Cooperative Non-Regenerative Relay Systems over Generalized Fading Channels , 2011, 2011 Proceedings of 20th International Conference on Computer Communications and Networks (ICCCN).

[2]  Pravin Varaiya,et al.  Capacity of fading channels with channel side information , 1997, IEEE Trans. Inf. Theory.

[3]  Oluwatobi Olabiyi,et al.  On ergodic capacity of cooperative non-regenerative relay networks in Rice fading environments , 2011, 2011 IEEE GLOBECOM Workshops (GC Wkshps).

[4]  Manav R. Bhatnagar,et al.  Performance Analysis of AF Based Hybrid Satellite-Terrestrial Cooperative Network over Generalized Fading Channels , 2013, IEEE Communications Letters.

[5]  Annamalai Annamalai,et al.  Tight bounds on the ergodic capacity of cooperative analog relaying with adaptive source transmission techniques , 2010, 21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.

[6]  Ali Abdi,et al.  A new simple model for land mobile satellite channels: first- and second-order statistics , 2003, IEEE Trans. Wirel. Commun..

[7]  S. Chen,et al.  Ergodic and Outage Capacity Analysis of Cooperative Diversity Systems under Rayleigh Fading Channels , 2009, 2009 IEEE International Conference on Communications Workshops.

[8]  Arif Iqbal,et al.  Integrated Satellite-Terrestrial System Capacity Over Mix Shadowed Rician and Nakagami Channels , 2013, Int. J. Commun. Networks Inf. Secur..

[9]  Aggelos Bletsas,et al.  A simple Cooperative diversity method based on network path selection , 2005, IEEE Journal on Selected Areas in Communications.

[10]  Mohamed-Slim Alouini,et al.  Outage probability of diversity systems over generalized fading channels , 2000, IEEE Trans. Commun..

[11]  Arif Iqbal,et al.  A Hybrid Satellite-Terrestrial Cooperative Network over Non Identically Distributed Fading Channels , 2011, J. Commun..

[12]  V. K. Sakarellos,et al.  Outage performance of cooperative Land Mobile Satellite broadcasting systems , 2013, 2013 7th European Conference on Antennas and Propagation (EuCAP).

[13]  Chun Loo,et al.  A statistical model for a land mobile satellite link , 1985, IEEE Transactions on Vehicular Technology.

[14]  Mark Nardin,et al.  Numerical evaluation of the confluent hypergeometric function for complex arguments of large magnitudes , 1992 .

[15]  Marie-Laure Boucheret,et al.  Exact Symbol Error Probability of Hybrid/Integrated Satellite-Terrestrial Cooperative Network , 2013, IEEE Transactions on Wireless Communications.

[16]  Sastri L. Kota,et al.  A survey on mobile satellite systems , 2010, Int. J. Satell. Commun. Netw..

[17]  Norman C. Beaulieu,et al.  On the Ergodic Capacity of Wireless Relaying Systems over Rayleigh Fading Channels , 2008, IEEE Transactions on Wireless Communications.

[18]  Gregory W. Wornell,et al.  Energy-efficient antenna sharing and relaying for wireless networks , 2000, 2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540).