IEEE Student Seminar: Power allocation for OFDM-based cognitive radio systems under average interference constraint

---

Dear all,

Details of second talk in Seminar Series on SP/COM:

Title: Power allocation for OFDM-based cognitive radio systems under
average interference constraint
Date/Time: March 20, 2013, 6.05 pm
Venue: DA 229, ACES
Speaker: Kedar Kulkarni, PhD Student

Abstract: Cognitive radio is an opportunistic spectrum access technique to
efficiently utilize spectrum allocated to licensed users (or Primary
users). Orthogonal frequency division multiplexing (OFDM) is considered as
a potential transmission technology for cognitive radio systems due to its
numerous advantages.

While using the available spectrum, it has to be ensured that performance
of the primary system doesn’t degrade due to interference from
cognitive/secondary user. Thus power allocation techniques like
water-filling or uniform allocation which are used in classical
OFDM-systems have to be modified to take into consideration the
interference constraint. We will discuss mathematical formulation of such
a power allocation problem for a given spectrum scenario.

Methods considered in the literature consider a static spectrum scenario
where bands not occupied by primary users remain unoccupied throughout the
transmission period of secondary user. Such power allocation schemes may
cause more interference to primary system in a practical scenario where
primary users can arrive or depart at any time. We will discuss a power
allocation scheme which takes into account this dynamic activity of
primary users.

You are encouraged to go through following references before coming to the
talk.
1. Bansal, G.; Hossain, J.; Bhargava, V.K., "Optimal and Suboptimal Power
Allocation Schemes for OFDM-based Cognitive Radio Systems," Wireless
Communications, IEEE Transactions on , vol.7, no.11, pp.4710,4718,
November 2008

2. Bansal, G.; Duval, O.; Gagnon, F., "Joint Overlay and Underlay Power
Allocation Scheme for OFDM-Based Cognitive Radio Systems," Vehicular
Technology Conference (VTC 2010-Spring), 2010 IEEE 71st , vol., no.,
pp.1,5, 16-19 May 2010

Regards,
Sanket Kalamkar
Ph.D. student(Signal processing,communications and networking),
Department of Electrical Engineering,
Indian Institute of Technology, Kanpur
Web Page: http://home.iitk.ac.in/~kalamkar

---

---

---

---