CVX_class 2014. Cvx tool setup Search for CVX tool ( )http://cvxr.com/cvx/ Dezip to your assigned directory Key cvx_setup in the.

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Presentation transcript:

CVX_class 2014

Cvx tool setup Search for CVX tool ( ) Dezip to your assigned directory Key cvx_setup in the matlab command window No errors! cvx has been successfully installed.

Cvx programming Between cvx_begin & cvx_end cvx_begin variables w(x,y) (complex, symmetric,…..)(refer 3.2) minimize (convex function) or Maximize (concave function) (refer 3.3) subject to …… constraints(refer to 3.4) cvx_end Some special variables – Cvx_optval – Cvx_status – Cvx_slvtol – Cvx_slvitr

Some cvx functions Quadprog Linprog Norm – Norm(*,Inf) – Norm(*,1) Refer to 3.5 and appendix B

Others Set (refer to 3.6 and appendix B.3)  Dual variables (refer to 3.7) Expression holders (refer to 3.8) DCP ruleset (refer to 4) Semidefinite programming using cvx (refer to 6) Geometric programming using cvx(refer to 7)

Q2: Chebyshev Center Consider a polyhedron composed of the halfspaces,,,, and, please plot the maximum norm ball inside the polyhedron and show the center and the radius of it

Q3:minimize the average sidelobe energy min s.t. where,.

Q4: transmit beamforming (1/4)

Q4: transmit beamforming (2/4) Total power minimization Epigraph method min

Q4: transmit beamforming (3/4)

Q4: transmit beamforming (4/4) Angle spectrum

Q5: Power allocation (a) (1/3) Worst case design

Q5: Power allocation (a) (2/3) Epigraph form Geometric Programming (GP) (refer to lecture 4, P4)

Q5: Power allocation (a) (3/3) Variables of change Convex problem

Q5: Power allocation (b) Minimize the total power, subject to all the users’ SINRs are not less than The problem can be represented as an Linear programming (LP) (refer to lecture 3, P22)

Q5: Power allocation (c) Take the worst user’s SINR in (a) in place of in (b), please re-design the transmit power, and compare with (a)