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Quadrature Phase Shift Keying (QPSK) and Offset Quadrature Phase Shift Keying(OQPSK) are two well accepted modulation techniques used in Code DivisionMultiple Access (CDMA) system. The Pulse Shaping Filters play an important rolein digital transmission. The type of Pulse Shaping Filter used, and itsbehavior would influence the performance of the communication system. This inturn, would have an effect on the performance of the Mobile Communicationsystem, in which the digital communication technique has been employed. In thispaper we have presented comparative study of some performance parameters orperformance metrics of a digital communication system like, Error VectorMagnitude (EVM), Magnitude Error, Phase Error and Bandwidth Efficiency for aQPSK transmission system. Root Raised Cosine (RRC) and Raised Cosine (RC) Pulseshaping filters have been used for comparison. The measurement results serve asa guideline to the system designer to select the proper pulse shaping filterwith the appropriate value of filter roll off factor (a) in a QPSK modulatedmobile communication system for optimal values of its different performancemetrics.

Comparison of Performance Metrics for QPSK and OQPSK Transmission Using  Root Raised Cosine and Raised Cosine Pulse shaping Filters for Applications  in Mobile Communication