Performance analysis of distributed space-time codes in amplify-and-forward mode

The idea of space-time coding, devised for multiple-antenna systems, can be applied to communication over a wireless relay network in amplify-and-forward (AF) mode. In this paper, we propose a distributed space-time protocol in which source node contributes in transmitting information as a virtual relay, for a general R-relay system. This system does not require channel state information at relays. Our simulation results show that we get significant performance gain, when the source to destination link is also employed for transmitting information. Furthermore, assuming MPSK and MQAM modulation and maximum likelihood (ML) detection, we derive a formula for the bit error probability of the investigated schemes in Rayleigh fading channels. Our analytical results have been confirmed by simulation results, using full-rate, full-diversity distributed codes.

[1]  M. J. Gans,et al.  On Limits of Wireless Communications in a Fading Environment when Using Multiple Antennas , 1998, Wirel. Pers. Commun..

[2]  Gregory W. Wornell,et al.  Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks , 2003, IEEE Trans. Inf. Theory.

[3]  Yindi Jing,et al.  CTH17-1: Using Orthogonal and Quasi-Orthogonal Designs in Wireless Relay Networks , 2006, IEEE Globecom 2006.

[4]  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).

[5]  Yindi Jing,et al.  Using Orthogonal and Quasi-Orthogonal Designs in Wireless Relay Networks , 2007, IEEE Transactions on Information Theory.

[6]  Elza Erkip,et al.  User cooperation diversity. Part II. Implementation aspects and performance analysis , 2003, IEEE Trans. Commun..

[7]  Babak Hassibi,et al.  High-rate codes that are linear in space and time , 2002, IEEE Trans. Inf. Theory.

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

[9]  Emre Telatar,et al.  Capacity of Multi-antenna Gaussian Channels , 1999, Eur. Trans. Telecommun..

[10]  Yan Mei,et al.  Wireless antennas - making wireless communications perform like wireline communications , 2003, 2003 IEEE Topical Conference on Wireless Communication Technology.

[11]  B. Hassibi,et al.  Distributed space-time codes in wireless relay networks , 2004, Processing Workshop Proceedings, 2004 Sensor Array and Multichannel Signal.

[12]  J. Nicholas Laneman,et al.  Cooperative diversity in wireless networks: algorithms and architectures , 2002 .