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Joint Multi-User Detection and Intersymbol Interference Cancellation for WCDMA Satellite UMTS

Silva, M. ; Correia, A.

International Journal of Satellite Communications and Networking Vol. 2003 - Special Issue on Interference Cancellation [], Nº 21, pp. 93 - 117, August, 2003.

ISSN (print): 1542-0981
ISSN (online): 1542-0973

Journal Impact Factor: 1,368 (in 2019)

Digital Object Identifier: 10.1002/sat.747

In this work we present two different Intersymbol Interference (ISI) cancellation systems, namely the Commutation Signaling (CS) and Orthogonal Code-Division Transmit Diversity (O-CDTD) in combination with satellite path diversity, which leads to a high diversity order. The ISI is due to the use of satellite path diversity (in order to introduce multipath diversity artificially). This work combines the proposed ISI cancellation systems with Subtractive Multi-User Detectors – a variation of the conventional Parallel Interference Cancellation (PIC) and Successive Interference Cancellation (SIC) for the downlink channel of S-UMTS. It is also considered the blind detection without knowledge of spreading sequences or the channel state information (CSI) of the interfering users with a Noise Whitening Matched Filter (NWMF) that combats the MAI through the whitening of the interfering power spectrum, also without and with the ISI cancellation systems – CS and O-CDTD. It is shown that the proposed PIC is a very promising detector to be used for the downlink of S-UMTS, especially when combined with CS or O-CDTD, being the NWMF efficient only when we consider jointly any of the proposed ISI cancellation systems for low number of interfering users.