NDLI: Cooperative Transmission Protocols Based on Decode-and-Forward Relaying and Multiuser Detection in CDMA Systems

Content Provider	IEEE Xplore Digital Library
Author	Hui Zhi Hongbo Zhu Longxiang Yang Xiaoguang Ding
Copyright Year	2011
Abstract	Cooperative transmission protocols based on decode-and-forward (DF) relaying and multiuser detection (MUD) for the wireless uplink transmission in synchronous CDMA systems are proposed in this paper on the condition that channel state information (CSI) is available at the destination, as well to the relays. In order to mitigate the multiple access interference (MAI) due to the usage of non-orthogonal spreading codes, we develop minimum mean square error (MMSE) or parallel interference cancellation (PIC) multiuser detectors after matched filters at relays or destination and evaluate the bit error rate (BER) performance. We discuss four kinds of protocols in this paper, which are multiuser detectors at relays, multiuser detector at destination, multiuser detectors at both relays and destination, without relay (direct transmission). The system performance is presented through Monte-Carlo simulations which are developed for different locations of relay and different number of sources to compare these protocols. Simulation results show that the protocol with MUD at both relays and destination achieves the best performance when SNR increases. Several protocols obtain lowest BER when the relay is close to a certain location and system performance degrades when the number of sources increases.
Starting Page	1
Ending Page	5
File Size	302343
Page Count	5
File Format	PDF
ISBN	9781424462506
ISSN	21619654
e-ISBN	9781424462520
DOI	10.1109/wicom.2011.6040211
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-23
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Multiuser detection Protocols Bit error rate Detectors Multiaccess communication Relays Signal to noise ratio
Content Type	Text
Resource Type	Article

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