Abstract
In this paper we propose a multistage nonlinear blind interference cancellation (MS-NL-BIC) receiver for direct-sequence code-division multiple-access (DS-CDMA) systems. The receiver uses higher order statistics of the received baseband signal. Specifically, we use the second and fourth moments of the received signal to determine a component of the received vector that has significant mean energy and low variability of the energy, both of which are favorable characteristics for application in an interference cancellation scheme that uses hard decisions. The structure of the receiver is multidimensional and can be viewed as a matrix of receivers. Each row in the matrix consists of receivers that perform (hard decisions) cancellation of successive components that have significant mean energy and low variability of the energy. The columns of the matrix essentially resemble multistage receivers that iteratively refine performance from earlier stages. Simulation results show that unlike linear receivers, the MS-NL-BIC is exceptionally efficient in systems with strong and highly correlated interferers, as may be the case in overloaded DS-CDMA systems.
This work is supported in part by the New Jersey Commission on Science and Technology under the New Jersey Center for Wireless Communication Technologies. This paper was presented, in part, at VTC 2000, Boston, September 2000.
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Samardzija, D., Mandayam, N., Seskar, I. (2002). Multistage Nonlinear Blind Interference Cancellation for DS-CDMA Systems. In: Poor, H.V., Tong, L. (eds) Signal Processing for Wireless Communication Systems. Information Technology: Transmission, Processing and Storage. Springer, Boston, MA. https://doi.org/10.1007/0-306-47322-4_16
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