Optimal Power Allocation to Diversity Branches of Cooperative MISO Sensor Networks

In the context of sensor networks, where every few dB saving counts, the novel node cooperation schemes are reviewed where MIMO techniques play a leading role. These methods could be treated as joint approach for designing physical layer of their communication scenarios. Then we analyzed the BER performance of transmission diversity schemes under a general fading channel model and proposed a power allocation strategy to the transmitting sensor nodes. This approach is then compared to an equal-power assignment method and its performance enhancement is verified by the simulation. Another key point of the contribution lies in the combination of optimal power allocation and sensor nodes- cooperation in a transmission diversity regime (MISO). Numerical results are given through figures to demonstrate the optimality and efficiency of proposed combined approach.

Authors:

• Rooholah Hasanizadeh
• Saadan Zokaei

Keywords:

• Optimal power allocation
• cooperative MISO scheme
• sensor networks
• diversity branch.

References:

[1] C. Chong and S. P. Kumar, "Sensor Networks: Evolution, Opportunities
and challenges," Proceedings of the IEEE, Vol. 91, No.8, Aug 2003.
[2] A. Paulraj, R. Nabar, and D. Gore, Introduction to Space-Time Wireless
Communications, Cambridge University Press, Cambridge, UK, 2003.
[3] D. Tse and P. Viswanath, Fundamentals of Wireless Communication,
Cambridge University Press, Cambridge, UK, 2005.
[4] E. Erkip, A. Sendonaris, A. Stefanov, and B. Aazhang, "Cooperative
Communication in Wireless Systems," DIMACS Series in Discrete
Mathematics and Theoretical Computer Science, 2002.
[5] A. Sendonaris, E. Erkip, and B. Aazhang, "User cooperation diversityÔÇö
Part I: System description," IEEE Trans. Comm., vol. 51, pp. 1927-
1938, Nov. 2003.
[6] A. Sendonaris, E. Erkip, and B. Aazhang, "User cooperation diversityÔÇö
Part II: Implementation Aspects and Performance Analysis," IEEE
Trans. Comm., vol. 51, No. 11, Nov. 2003.
[7] A. Stefanov and E. Erkip, "Cooperative Space-Time Coding for
Wireless Networks," ITW2003, Paris, France, March 31 - April 4, 2003.
[8] V. Rodoplu and T. H. Meng, "Minimum Energy Mobile Wireless
Networks," IEEE J. on Select. Areas in Comm., Vol. 17, No. 8, Aug
1999.
[9] S. Cui, A. J. Goldsmith, and A. Bahai, "Energy efficiency of MIMO and
Cooperative MIMO Techniques in Sensor Networks," IEEE J. on Select.
Areas in Comm., 2004.
[10] S. M. Alamouti, "A Simple Transmit Diversity Technique for Wireless
Communications," IEEE J. on Select. Areas in Comm, Vol. 16, No. 8,
Oct 1998.
[11] J. G. Proakis, Digital Communications, 4th Edition, McGraw Hill, USA,
2001.