Single Carrier Frequency Domain Equalization Space---Time Block-Spread CDMA with Multiuser Interference-Free Detection

Authors:
Kodzovi Acolatse;Yeheskel Bar-Ness
Affiliations:
Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, USA 07102;Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, USA 07102
Venue:
Wireless Personal Communications: An International Journal
Year:
2011

Citing 6
Cited 1

Discrete-time signal processing

Discrete-time signal processing
CDMA: principles of spread spectrum communication

CDMA: principles of spread spectrum communication
MUI-free receiver for a synchronous DS-CDMA system based on blockspreading in the presence of frequency-selective fading

IEEE Transactions on Signal Processing
Efficient adaptive receivers for joint equalization and interference cancellation in multiuser space-time block-coded systems

IEEE Transactions on Signal Processing
Space-time-coded CDMA uplink transmission with MUI-free reception

IEEE Transactions on Wireless Communications
Space-time block coding for single-carrier block transmission DS-CDMA downlink

IEEE Journal on Selected Areas in Communications

Frequency-Domain Equalization for Orthogonal and Quasi-Orthogonal STBCs over Frequency-Selective Wireless and Power-Line Channels

Wireless Personal Communications: An International Journal

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Abstract

In this paper, we study a single carrier space---time block-spread (STBS) with frequency domain equalization combined with direct-spread code division multiple access (CDMA) which we term, SCFDE-STBS-CDMA. We propose a novel SCFDE space---time scheme for CDMA that achieves multiuser-interference free reception and performs well in both slow and fast fading frequency selective channel. The orthogonality among the users is preserved at the receiver allowing a multiuser-free MUI-free detection in slow fading channel. In fast fading channel, we proposed a MMSE detector that exploits the time diversity of the fast fading channels. In the conventional counterpart scheme proposed in the literature, the length of the spreading factor affect negatively the performance of the system when the channel is fast fading while in the proposed scheme, the spreading factor is an additional degree of freedom that do not degrade the system performance. Since the maximum number of users supported depends on the spreading factor, the proposed scheme can then maintain more users than the conventional one in fast fading channels. The bit-error rate (BER) performance of the proposed scheme is analyzed and compared with the conventional approach in the literature.