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Joint Source and Relay Design for MIMO Relaying Broadcast Channels
In this letter, we address the optimal source and relay matrices design for
the multiple-input multiple-output~(MIMO) relaying broadcast channels~(BC) with
direct links~(DLs) based on weighted sum-rate criterion.This problem is
nonlinear nonconvex and its optimal solution remains open. To develop an
efficient way to solve this problem,we first set up an equivalent problem, and
solve it by decoupling it into two tractable subproblems. Finally, we propose a
general linear iterative design algorithm based on alternative optimization.
This iterative design algorithm is convergent since the solution of each
subproblem is optimal and unique. The advantage of the proposed iterative
design scheme is demonstrated by numerical experiments