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This paper presents efficient and high performance multiuser detectors (MUD) for multi-code DS-CDMA uplink system under different system loading over severe CM4 UWB indoor channel dispersion. Under low to moderate loading (up to 4 users), we first present a RAKE with parallel bi-directional decision feedback (RAKE-PBDDF) MUD for solving the intersymbol, multi-code, and multiple access interferences...
We consider here the problem of multi-user detection for randomly spread direct-sequence (DS) coded-division multiple access (CDMA) over flat fading channels. The analysis is focused on the case of many users, and large spreading sequences such that their ratio, which is the system load, is kept fixed. Spectral efficiency of practical linear detectors such as match-filter and decorrelator employing...
On the uplink of a DS-CDMA system with the imperfect successive interference cancellation (SIC) technique, K active users correspond to K! decoding orders. Due to the constraint of the received power, not all the possible decoding orders may be feasible, rendering the failure of SIC algorithm. Meanwhile, examining the feasibility of the system among all these decoding orders directly by the exhaustive...
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