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Critical load of oversaturated systems with multistage successive interference cancellation

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2 Author(s)
Vanhaverbeke, F. ; TELIN/DIGCOM, Ghent Univ., Gent, Belgium ; Moeneclaey, M.

The allowable load in oversaturated CDMA systems is investigated, so that the uncoded performance with multistage successive interference cancellation (m-SIC) remains close to the single user bound. As oversaturated systems, we consider pseudo-noise CDMA (PN), pseudo noise/ orthogonal CDMA (PN/O) and orthogonal/orthogonal CDMA (O/O). For O/O, we make a distinction between scrambled O/O (s-O/O) and overall-permuted O/O (o-O/O). Because of the special structure of the O/O signature set, the intrinsic delay of m-SIC is drastically reduced in O/O as compared to PN and PN/O. For all systems, it is found that the achievable acceptable overload increases with the spreading factor. The o-O/O system outperforms s-O/O, while PN/O is inferior to o-O/O. Both O/O systems and the PN/O system clearly outperform PN.

Published in:

Vehicular Technology Conference, 2003. VTC 2003-Spring. The 57th IEEE Semiannual  (Volume:4 )

Date of Conference:

22-25 April 2003

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