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The performance of the WCDMA system is degraded due to the various network impairments such as interference, fading & noise and also due to network load. The work in this presents performance analysis of Zero Forcing Successive Interference Cancellation (ZF-SIC) scheme for the multiuser detection in the WCDMA environment. The Bit-Error Rate (BER) of WCDMA using ZF-SIC for Binary Phase Shift Keying (BPSK) and Quadrature Phase Shift Keying (QPSK) has been analyzed. The ZF-SIC scheme subtracts the strongest received signal from the original one by one till all users have been detected and demodulated. The proposed scheme also suppressed Multiple-Access Interference (MAI) and improved the system performance significantly. The simulation results showed that the BER is decreased the with number of users increased.
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