Review of Multimode Techniques for Software Defined Radio

Nowadays, the behavior of a communication system can be modified by simply changing its software and resulting new radio model is called Software Defined Radio. SDR is the popular research direction of the 3G and 4G mobile communication. This model uses both analog and digital modulation and demodulation methods which are discussed in this paper. The aim is to study and understand multimode techniques (i.e. amplitude modulation, Frequency modulation and binary Phase shift keying ,binary Frequency shift keying, quadrature phase shift keying) of SDR in audio frequency band.