Special Issue Article Open Access

VLSI Implementation of Variable Length Radix- 2^5 for Cognitive Radio System

Abstract

Cognitive Radio System (CRS) is a radio system which is aware of its operational and geographical environment, established policies, and its internal state. It is able to dynamically and autonomously adapt its operational parameters (sub carrier mapping) and to increase the system throughput for 4G requirements. Fast Fourier Transform (FFT) has already been widely applied to area of signal analysis, frequency spectrum estimate and OFDM-based communication systems. In OFDM systems, the required FFT sizes vary according to different operation standards or system parameters. Hence, it's desirable to design a domain specific, power-scalable, high speed and area-efficient variablelength FFT processor. In this project propose a radix- 2^5 FFT which will give similar performance with radix-32 but it is radix actually radix-2. This can use it for any 2^N mapping requirements. Finally it is carried out VLSI implementation of proposed system and its performance was analyzed

J. Jagan Babu, K.E.Prelly

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