Optimal set of LFSR Common Operators for Multi-Standards Cognitive Radio Terminals
Résumé
The supremacy of Software Defined Radio (SDR) technology in the field of Cognitive Radio (CR) is undeniable. SDR is a keystone of CR. In SDR, parameterization is a very promising technique that consists of designing radio systems entities in a way which permits to take advantage of the programmable or at least reconfigurable capabilities of the underlying hardware of SDR systems. In this article we describe the linear feedback shift register (LFSR) as a common operator (CO) which is one of the first implementation of common operator technique on the area of techniques of parameterizations. We explain our four developed common architectures to design 16 LFSR COs that can carry out several operations of multi-standard CR receivers. We also give the implementation details on Altera Cyclone II. Either a single or combination of these LFSR operators can be used to perform the functions as necessitated by the different air interfaces to be supported by SDR. Based on the foundation of the common operators we describe a procedure which identifies an architecture that minimizes the cost of the radio. Results obtained by optimization validate the implementation results.