QoS and Energy Management in Cognitive Radio Network by Vishram Mishra Jimson Mathew & Chiew-Tong Lau

Author:Vishram Mishra, Jimson Mathew & Chiew-Tong Lau
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

2.4.1 From FPGAs to Software Defined Radio

One of the requirements is that cognitive radio systems change its behaviour according to its context autonomously, based on experience and learning. Therefore the system should be able to interact with the reconfigurable network node. Also, since real time sensing is computationally intensive, it requires for high demanding digital signal processing algorithms.

Until recently, reconfigurable logic and Field Programmable Logic Array (FPGA) chips have been used primarily for prototyping. However, it is now being realized that reconfigurable architectures are a separate family in their own right, just as processors and Application specific Integrated Circuits (ASIC) are with unique properties that can be taken advantage of. General Purpose Processors are highly programmable platforms, however the performance is limited. The basic building block of FPGA is a reconfigurable cell which is implemented using Look-Up-Table (LUT), Programmable Logic Array (PLA) or Memory. LUT or memory-based cell is configured by writing the result of the combinational logic to the cell [25]. That is some modules need to be selectively reconfigured or reassigned for new mode of operation in software defined radio. Therefore, reconfigurable architectures will give greater flexibility in such an environment [24].

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