Performance Analysis using Adaptive Decision for Parallel Interference Cancellation Receiver in Asynchronous Multicarrier DS-CDMA Systems
R.Gomathi1, A.K.Gnanasekar2, V.Nagarajan3

1R.Gomathi, Vlsi Design, Adhiparasakthi Engineering College, Anna Tech, TamilNadu, India.
2A.K.Gnanasekar, ECE Department, Adhiparasakthi Engineering College ,Anna Tech, TamilNadu, India.
3V. Nagarajan, ECE Department, Adhiparasakthi Engineering College ,Anna Tech, TamilNadu, India.

Manuscript received on February 15, 2012. | Revised Manuscript received on February 20, 2012. | Manuscript published on March 05, 2012. | PP: 259-264 | Volume-2 Issue-1, March 2012. | Retrieval Number: A0429022112 /2012©BEIESP
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Abstract: In this paper, we present and analyze the performance of asynchronous multicarrier direct-sequence code division multiple-access (DS-CDMA) system using adaptive decision at the receiver. In addition to that parallel interference cancellation (PIC) scheme is presented at the receiver. The PIC scheme offers better interference suppression capability. At the last stage, the interference cancelled outputs from all the subcarriers are maximal ratio combined (MRC) and feeds viterbi decoder. Convolutionally coded multicarrier DS-CDMA system compares BER from the decision which helps in further improvement.

Keywords: Interference cancellation, Multiple access Interference.