Electrical Engineering-Systems Dept.

סמינר מחלקתי

You are invited to attend a lecture by

Dr. Yair Noam

(Wireless Systems Lab,Stanford University)

on the subject:

Blind Null-Space Learning for MIMO Underlay  Cognitive Radio Networks

This work proposes a blind technique for MIMO  cognitive radio Secondary Users (SU) to transmit in the same band   simultaneously  with a Primary User (PU) under a maximum interference constraint.   In the proposed technique, the SU is  able to  meet the interference constraint   of  the   PU without explicitly estimating the interference channel matrix to the PU and without burdening the PU with any interaction   with the  SU.

  The only condition required of the PU is that for a short time interval it     uses a power control scheme such that  its transmitted power is a monotonic function of the interference inflicted by the   SU.  During this time interval, the SU  iteratively  modifies the spatial orientation of its   transmitted signal and measures  the effect of this modification on  the PU's total transmit power.

The entire process is based  on energy measurements which is very  desirable from an implementation point of view.