Hi sanjeev kumar,
For demodulation of MSK we could use matlab components.
The following links may help you to design :
http://www.dsplog.com/2009/06/16/msk-transmitter-receiver/
http://in.mathworks.com/help/comm/ref/mskdemod.html
http://in.mathworks.com/matlabcentral/fileexchange/24570-msk-modulation-and-demodulation
http://in.mathworks.com/help/comm/ref/comm.mskdemodulator-class.html
http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=163564