Comparison of Bit Error Rate Performance between BPSK and 16QAM modulation scheme in cognitive radio network

Abstract

Radio spectrum is considered as one of the most evaluated natural resources in communication system, which all of users shares this resource and is affected directly by any change on it. Also one of the latest technologies in radio spectrum management called Cognitive radio emerged in last years of 20 century; leads to new era of exploit radio spectrum in basis of sharing resources without affecting other user whom may coexists in the same band. From this point of view this paper discusses cognitive radio main concept in band coexistence through choosing the appropriate modulation scheme, which can achieves data rate and control QoS. The discussion will be concern of two modulation schemes BPSK and 16QAM, their performance in term of bit error rate BER and the ability to achieve data rate Key word: PU, SU, SDR, BPSK, 16QAM, QoS, Matlab, simulink, Cognitive radio.