Space time coded cooperative relaying technique for multihop communications

In multihop wireless networks, the quality of communications is degraded due to the relay transmissions over fading channels. Space-time code using multiple transmit antennas is an effective countermeasure for fading. For terminals which have only one antenna due to size/cost limitations, user cooperation has been introduced as a diversity technique. A new cooperative relaying scheme is proposed in order to combat the effects of fading in multihop communications among single antenna terminals. This scheme utilizes space-time code for cooperative relaying and is developed in both frequency-flat and frequency-selective fading channels for exploiting space and path diversity gain. By computer simulations, it is shown that the scheme can achieve almost full spatial diversity in multihop communications by both non-regenerative relaying with SNR estimation and regenerative relaying with error detection.

[1]  Elza Erkip,et al.  Increasing uplink capacity via user cooperation diversity , 1998, Proceedings. 1998 IEEE International Symposium on Information Theory (Cat. No.98CH36252).

[2]  Ying-Dar Lin,et al.  Multihop cellular: a new architecture for wireless communications , 2000, Proceedings IEEE INFOCOM 2000. Conference on Computer Communications. Nineteenth Annual Joint Conference of the IEEE Computer and Communications Societies (Cat. No.00CH37064).

[3]  A. Mawira,et al.  Radio aspects of hybrid wireless ad-hoc networks , 2001, IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. Proceedings (Cat. No.01CH37202).

[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]  Aria Nosratinia,et al.  Cooperation diversity through coding , 2002, Proceedings IEEE International Symposium on Information Theory,.

[6]  Arogyaswami Paulraj,et al.  A transmit diversity scheme for channels with intersymbol interference , 2000, 2000 IEEE International Conference on Communications. ICC 2000. Global Convergence Through Communications. Conference Record.

[7]  Siavash M. Alamouti,et al.  A simple transmit diversity technique for wireless communications , 1998, IEEE J. Sel. Areas Commun..

[8]  M. Rupp,et al.  On extended Alamouti schemes for space-time coding , 2002, The 5th International Symposium on Wireless Personal Multimedia Communications.

[9]  Ran Gozali,et al.  Space-Time Codes for High Data Rate Wireless Communications , 2002 .

[10]  Hui Li,et al.  Multihop communications in future mobile radio networks , 2002, The 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.

[11]  Naofal Al-Dhahir,et al.  Single-carrier frequency-domain equalization for space-time block-coded transmissions over frequency-selective fading channels , 2001, IEEE Communications Letters.