A Multiuser Detection Receiver Using Blind Antenna Array and Adaptive Parallel Interference Cancellation |
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Authors: | S Nayeb Nazar W-P Zhu MO Ahmad and MNS Swamy |
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Affiliation: | (1) Department of Electrical and Computer Engineering, Concordia University, 1455 de Maisonneuve West, Montreal, Quebec, H3G 1M8, Canada |
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Abstract: | In this paper, the problem of multiuser detection for synchronous code division
multiple access systems in both additive white Gaussian noise and multipath channels is
addressed. A new multiuser detection receiver that uses an adaptive blind array along with
an adaptive parallel interference canceler is proposed. The replacement of a conventional
antenna array with a two-dimensional RAKE receiver is also considered for frequency
selective Rayleigh fading channels. By using a constrained optimization criterion along
with the gradient-projection algorithm, a blind algorithm for the adaptation of the array response
vector is proposed. The new algorithm is superior to a few typical blind algorithms
in the literature in terms of both performance and computational complexity. The proposed
receiver has the ability to cancel very strong multiple access interference coming from the
same direction as the desired signal. Simulation results are presented to show the excellent
performance of the proposed combination scheme in comparison to that of using either a
multiuser detection or adaptive antenna arrays in a severe near-far situation. |
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Keywords: | |
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