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Space-Time Turbo-coded turbo parallel interference cancellation multi-user detection (ST-TuC-PIC-MUD)

Parallel interference cancellation (PIC) is a promising, powerful, and relatively low complexity method for mitigating multi-user interference especially on the up-link of WCDMA systems such as UMTS, where chip equalisation is not applicable. Moreover turbo-codes, which are part of the UMTS standard, allow the use of soft feedback from the decoder in an iterative joint PIC and decoding algorithm, which has been shown to be very effective, giving a BER performance even in a heavily-loaded multi-user CDMA system very close to the single user bound.

Space-time turbo-codes, a form of turbo-coded spatial multiplexing, allows the bandwidth efficiency of an uplink connection to be increased by a factor given by the number of transmit antenna elements available. FLOWS has demonstrated a space-time turbo-coded turbo parallel interference cancellation receiver that allows this increase in link capacity while still maintaining a BER performance very close to the single user bound for a SISO system (using a single antenna at both ends of the link). Moreover it has shown that with turbo-codes it is not necessary to use an MMSE filter in the receiver, which must be re-calculated at every iteration.

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Reported by

University of York
Heslington -
YO1 5DD York
United Kingdom
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