A number of latest technologies are being integrated by means of the telecommunications enterprise because it prepares for the subsequent technology cellular offerings. One of the key changes integrated within the multiple channel get entry to strategies is the choice of Orthogonal Frequency Division Multiple Access (OFDMA) for the air interface. This paper affords a survey of various a couple of channel get right of entry to schemes for 4G networks and explains the significance of these schemes for the development of spectral efficiencies of cognitive radio network. The paper also discusses approximately using a Multiple Input and Multiple Output (MIMO) strategies to improve sign reception and to combat the results of multi-path fading. A comparative overall performance analysis of different multiple access schemes inclusive of Time division multiple access (TDMA), FDMA, Code division multiple access (CDMA) & Orthogonal frequency division multiple access (OFDMA) is made vis-à-vis layout parameters to focus on the advantage and limitations of these schemes.