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Two-stage CMA blind multiuser detection for DS-CDMA systems in multipath fading

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2 Author(s)
Gelli, G. ; Dipartimento di Ingegneria Elettronica e delle Telecomunicazioni, Univ. degli Studi Federico II di Napoli, Italy ; Verde, F.

We consider the problem of mitigating intersymbol interference (ISI) due to multipath fading as well as multiple-access interference (MAI) in direct sequence code-division multiple-access (DS-CDMA) systems. The proposed multiuser receiver is based on the constant-modulus algorithm (CMA), which is known to provide satisfactory performance in a blind setting. In order to overcome the CMA interference capture problem typical of a multiuser scenario, we propose to adopt a two-stage receiver: in the first stage, partial MAI suppression is achieved by exploiting the desired user signature structure properties; in the second stage, based on CMA, the residual MAI and the ISI are removed, and the desired symbols are reliably recovered. Computer simulations show that, in a severe multipath environment, the proposed blind approach achieves a significant performance gain in comparison with existing blind methods

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Image and Signal Processing and Analysis, 2001. ISPA 2001. Proceedings of the 2nd International Symposium on

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