This paper presents a software-defined radio (SDR) system with reconfigurable architecture for OFDM transceivers. DSP-based architecture provides interoperability and adaptability among operational modes of the OFDM system. But limitations due to memory, bus speed and data type compatibility in DSP motivates SDR architecture over USRP boards. This model is initial evaluation of the suitability of OFDM transmission over USRP for an upcoming large scale CR testbed. SDR Architecture supporting 3GPP-LTE microcomputer object (MCO) system is designed for both flexibility and extensibility. It explains new simulation models in MATLAB that lead toward the concept of the virtual system sample. In this framework, we completely merge hardware, software, algorithms, into one radio link system level objected oriented model. Extensibility concepts, virtual abstraction, and acceleration hardware are important architectural features. On the other hand, OFDM is a promising technique for high-speed data transmission over multipath fading channels and has been considered to be the best candidate for 4G mobile networks.
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