BER-optimized linear parallel interference cancellers for multicarrier DS-CDMA systems

Manohar, S. ; Tikiya, V. ; Annavajjala, R. ; Chockalingam, A. (2005) BER-optimized linear parallel interference cancellers for multicarrier DS-CDMA systems In: GLOBECOM '05. IEEE Global Telecommunications Conference, 2005, 28 November-2 December 2005, St. Louis, USA.

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Official URL: http://ieeexplore.ieee.org/document/1578441/

Related URL: http://dx.doi.org/10.1109/GLOCOM.2005.1578441

Abstract

In this paper, we consider the design and bit error performance analysis of 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 decision 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. In order to choose these weights optimally, we derive exact closed-form expressions for the bit error rate (BER) at the output of different stages of the LPIC, which we minimize to obtain the optimum weights for the different stages. We show that the proposed BER-optimized weighted LPIC scheme performs better than the MF detector and the conventional LPIC scheme (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:102408
Deposited On:26 Mar 2017 14:31
Last Modified:26 Mar 2017 14:31

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