Delay Analysis of a Point-to-Multipoint Spectrum Sharing Network with CSI Based Power Allocation† This work was supported in part by King Abdullah University of Science and Technology (KAUST) and in part by NPRP grant number NPRP 08-101-2-025 from the Qatar National Research Fund (a member of Qatar Foundation). the statements made herein are solely the responsibility of the authors. Conference Paper uri icon


  • In this paper, we analyse the delay performance of a point-to-multipoint cognitive radio network which is sharing the spectrum with a point-to-multipoint primary network. The channel is assumed to be independent but not identically distributed and has Nakagami-m fading. A constraint on the peak transmit power of the secondary user transmitter (SU-Tx) is also considered in addition to the peak interference power constraint. Based on the constraints, a power allocation scheme which requires knowledge of the instantaneous channel state information (CSI) of the interference links is derived. The SU-Tx is assumed to be equipped with a buffer and is modelled using the M/G/1 queueing model. Closed form expressions for the probability distribution function (PDF) and cumulative distribution function (CDF) of the packet transmission time is derived. Using the PDF, the expressions for the moments of transmission time are obtained. In addition, using the moments, the expressions for the performance measures such as the total average waiting time of packets and the average number of packets waiting in the buffer of the SU-Tx are also obtained. Numerical simulations corroborate the theoretical results. © 2012 IEEE.

author list (cited authors)

  • Khan, F. A., Tourki, K., Alouini, M., & Qaraqe, K. A.

citation count

  • 3

publication date

  • October 2012