BER analysis of weighted interference cancellation in multicarrier DS-CDMA systems

Manohar, S. ; Tikiya, V. ; Annavajjala, R. ; Chockalingam, A. (2006) BER analysis of weighted interference cancellation in multicarrier DS-CDMA systems In: IEEE Wireless Communications and Networking Conference, 2006. WCNC 2006, 3-6 April 2006, Las Vegas, USA.

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Official URL: http://ieeexplore.ieee.org/document/1683606/

Related URL: http://dx.doi.org/10.1109/WCNC.2006.1683606

Abstract

In this paper, we present the design and bit error performance analysis of weighted linear parallel interference cancellers (LPIC) for multicarrier (MC) DS-CDMA systems. We propose an LPIC scheme where we estimate (and cancel) the multiple access interference (MAI) based on the soft outputs on individual subcarriers, and the interference cancelled outputs on different subcarriers are combined to form the final decision statistic. We scale the MAI estimate on individual subcarriers by a weight before cancellation; these weights are so chosen to maximize the signal-to-interference ratios at the individual subcarrier outputs. For this weighted LPIC scheme, using an approach involving the characteristic function of the decision variable, we derive exact bit error rate (BER) expressions for different cancellation stages. Using the same approach, we also derive exact BER expressions for the matched filter (MF) and decorrelating detectors for the considered MC DS-CDMA system. We show that the proposed weighted LPIC scheme performs better than the MF detector and the conventional LPIC (where the weights are taken to be unity), and close to the decorrelating detector.

Item Type:Conference or Workshop Item (Paper)
Source:Copyright of this article belongs to Institute of Electrical and Electronics Engineers.
ID Code:102403
Deposited On:26 Mar 2017 14:32
Last Modified:26 Mar 2017 14:32

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