Multiple-Antenna Multiple-Relay Cooperative Communication System with Beamforming

In this paper we study the threshold decode and forward (T-DF) fixed relays network with beamforming, which is more reliable than conventional decode and forward (DF) relaying. Deployment of a small number of antennas on fixed relays is easier than on mobile terminals, therefore, the impact of multiple antennas on the outage probability of cooperating fixed relays is considered. Under the total sum power constraint (TSPC) of all relays and also maximum per-relay power constraint (PRPC), the optimum beamforming weights have been found to maximize the received SNR at the destination. It is determined that increasing the number of relays and antennas at each relay increases capacity. The performance of threshold-maximal ratio combining (T-MRC) and threshold-selection combining (T-SC) of the multiple-antenna multiple fixed relays with beamforming is derived. It is observed that the performance of the network with selection combining (SC) configuration is close to the network in which maximal ratio combining (MRC) is used, in addition that it is less complex and less expensive to implement. The outage probability in Rayleigh fading channels is also analyzed.

[1]  Gregory W. Wornell,et al.  Cooperative diversity in wireless networks: Efficient protocols and outage behavior , 2004, IEEE Transactions on Information Theory.

[2]  Gerhard Fettweis,et al.  Relay-based deployment concepts for wireless and mobile broadband radio , 2004, IEEE Communications Magazine.

[3]  Halim Yanikomeroglu,et al.  Space Diversity for Multi-antenna Multi-relay Channels , 2006 .

[4]  Halim Yanikomeroglu,et al.  Adaptive Multi-Stream Relaying , 2006, 2006 Canadian Conference on Electrical and Computer Engineering.

[5]  Joseph Lipka,et al.  A Table of Integrals , 2010 .

[6]  Athanasios Papoulis,et al.  Probability, Random Variables and Stochastic Processes , 1965 .

[7]  Halim Yanikomeroglu,et al.  Cooperative relaying in multi-antenna fixed relay networks , 2007, IEEE Transactions on Wireless Communications.

[8]  I. Miller.  Probability, Random Variables, and Stochastic Processes , 1966 .

[9]  Dongwoo Kim,et al.  Cooperative System with Distributed Beamforming and Its Outage Probability , 2007, 2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring.

[10]  John S. Thompson,et al.  On the outage capacity of MIMO multihop networks , 2005, GLOBECOM '05. IEEE Global Telecommunications Conference, 2005..

[11]  Elza Erkip,et al.  User cooperation diversity. Part I. System description , 2003, IEEE Trans. Commun..

[12]  Mostafa Kaveh,et al.  Exact symbol error probability of a Cooperative network in a Rayleigh-fading environment , 2004, IEEE Transactions on Wireless Communications.

[13]  Helmut Bölcskei,et al.  Distributed orthogonalization in large interference relay networks , 2005, Proceedings. International Symposium on Information Theory, 2005. ISIT 2005..