Near Optimum Multiuser Detection With Closest Lattice Point Search

Download Now Date Added: Apr 2011
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In this paper, the authors consider a low-complexity multiuser detection for downlink of High Speed Packet Access (HSPA) system. Instead of attempting to perform the Maximum Likelihood (ML) detection of all users in multiple cells, which is impractical for battery powered mobile receiver, they utilize interference cancelled chips obtained from iterative Linear Minimum Mean Square Error (LMMSE) estimation to perform a near ML detection in a reduced dimensional system. As a result, the worst case complexity of the detection process, achieved by the Closest Lattice Point Search (CLPS), is bounded to a controllable level irrespective of multipath spans.