International Journal of Advanced Research in Computer Engineering & Technology
Cognitive Radio is a proficiency that enables the cognitive users (secondary users) to stumble on white space (unused spectrum) in the primary user's spectrum band and allowing them to make exploit of the detected spectrum of data transmission. As soon as the white space has been recognized, it will be worn by a number of secondary users. When the number of users exists it is alike as Multiple Input Multiple Output (MIMO). Provision a large number of users bring into play the detected spectrum for data transmission, this will forge mutual interference among them. The MIMO characteristics are improved by using Orthogonal Frequency Division Multiplexing (OFDM) using its orthogonal subcarriers. OFDM has an added advantage of producing less BER yet for the negative SNR.