MIMO detection for high order QAM by canonical dual approach

We develop a canonical dual approach for solving the mimo problem. first,a special linear transformation is introduced to reformulate the original problem into a {-1,1 } constrained quadratic programming problem. then,we derive a canonical dual problem which is piecewise continuous problem with no duality gap. under certain conditions,the canonical problem becomes a concave maximization dual problem over a convex feasible domain. by getting the stationary point of the canonical dual problem,we can find either an optimal or approximate solution of the original problem. a gradient decent algorithm is proposed to solve the mimo problem and simulation results are provided to demonstrate the effectiveness of the method. © 2015 ye tian and jr-fong dang.