Performance Analysis of Parallel Interference Cancellation (PIC) Over Rayleigh Channel In DS- CDMA Systems
Sanmati Jain1, Sandeep Agrawal2, Asif Iqbal3
1Sanmati Jain, M.E Scholar, Electronics & Communication Engineering Depatrtment, R.G.P.V Bhopal./Mahakal Institute of Technology/Ujjain, India
2Professor Sandeep Agrawal Associate Professor, Electronics & Communication Engineering Depatrtment, R.G.P.V Bhopal. /Mahakal Institute of Technology/Ujjain, India.
3Asif Iqbal, M.E Scholar, Electronics & Communication Engineering Depatrtment, R.G.P.V Bhopal. /Mahakal Institute of Technology/Ujjain, India.
Manuscript received on June 03, 2013. | Revised Manuscript received on June 27, 2013. | Manuscript published on July 05, 2013. | PP: 113-118 | Volume-3 Issue-3, July 2013. | Retrieval Number: C1649073313/2013©BEIESP
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: In this paper, we present and analyze the performance of a parallel interference cancellation (PIC) scheme for multicarrier (MC) direct-sequence code-division multiple-access (DS-CDMA) systems. In order to mitigate the multi-path interference (MPI) in the DS CDMA system. At each cancellation stage in the proposed PIC scheme, on each subcarrier, a weighted sum of the soft outputs of the other users in the current stage is cancelled from the soft output of the desired user to form the input to the next stage. At the last stage, the interference cancelled outputs from all the subcarriers are maximal ratio combined (MRC) to form the decision statistic. Parallel interference elimination is first proposed in this paper the multi-path interference are evaluated by tentative decision and known user information. Then the performance over Rayleigh fading channel are analyzed and compared to Matched filter, Decorelator, successive interference cancellation (SIC) and conventional parallel interference cancellation (PIC). It is shown that PIC performance can be improved greatly by using this method with simple structure and easy implementation.
Keywords: MRC; Multi-path interference Parallel interference cancellation; Rayleigh fading; Serial interference cancellation (SIC).