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A linear receiver for coded multiuser CDMA

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3 Author(s)
Alexander, P.D. ; Mobile Commun. Res. Centre, Univ. of South Australia, SA, Australia ; Rasmussen, L.K. ; Schlegel, C.B.

We consider a CDMA system with error-control coding. Optimal joint decoding is prohibitively complex. Instead, we propose a sequential approach for handling multiple-access interference and error-control decoding. Error-control decoding is implemented via single-user soft-input decoders utilizing metrics generated by linear algebraic multiuser metric generators. The decorrelator, and a new scheme termed the projection receiver, are utilized as metric generators. For a synchronous system, the coded performance of the projection receiver metric is shown to be superior to the decorrelator even though they are equally complex. Also, the theoretical degradation relative to the single user bound is derived

Published in:

Communications, IEEE Transactions on  (Volume:45 ,  Issue: 5 )