| This study proposes a new methodology for selecting the common operators for Software Defined Radios. It aims at optimizing resources use in the design of multi-standard SDR systems. A multi-standard SDR or reconfigurable radio system consists of software components that execute specific processing steps in a continuous flow. Their behavior can be changed by a reconfiguration procedure. In a common operator design, this change only requires an adjustment of certain parameters, which minimizes the reconfiguration overhead at run-time. In order to optimize the choice of those operators, the interrelationships among the various components of the system are represented in an oriented graph. The associated metrics and the cost function investigated to solve the optimization problem are presented. An illustration is given on an example , which even if not fully realistic, is sufficiently representative in its structure and orders of magnitude to provide useful insights. The optimization problem is solved by an heuristic based on simulated annealing and validated by comparison with an exhaustive search. |
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