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Performance analysis of linear joint equalization and multiple access interference cancellation for multitone CDMA

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Abstract

In [18] the combination of multitone modulation with direct sequence spectrum spreading has been introduced. The performance of a correlation receiver with diversity has been evaluated for a multipath channel in the presence of a multiple access interference (MAI) using the Gaussian assumption. In the present paper we analyze the problem of joint equalization and cancellation of the multipath and multiple access interferences for these multitone CDMA (Code Division Multiple Access) systems. A linear structure is first investigated for a mean square error (MSE) criterion. In order to understand the potential of the system we study the steady-state behavior of the joint equalizer-canceler. The investigation is carried out for a joint device following a bank of matched filters and assuming perfect carrier phase and timing recovery. An exact expression for the bit error probability of BPSK symbols before and after cancellation, is obtained in the form of an integral The performance of the joint device is investigated for different types of channels. The resistance to the near-far effect is also demonstrated. Then adaptive structures are derived from a least square approach. Their performance is demonstrated by means of computer simulations.

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Authors and Affiliations

  1. UCL Communications and Remote Sensing Laboratory, 2, place du Levant, B-1348, Louvain-la-Neuve, Belgium

    L. Vandendorpe & O. Van De Wiel

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  1. L. Vandendorpe
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  2. O. Van De Wiel
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This author would like to thank the Belgian NSF for its financial support.

This author would like to thank the Belgian IRSIA for its financial support.

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Vandendorpe, L., Van De Wiel, O. Performance analysis of linear joint equalization and multiple access interference cancellation for multitone CDMA. Wireless Personal Communications 3, 17–36 (1996). https://doi.org/10.1007/BF00333921

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