Performance of Multiantenna Multicarrier DS-CDMA Using OVSF Codes Assisted Space-Time Spreading in Time-Selective Fading Channels


Yang, Lie-Liang (2008) Performance of Multiantenna Multicarrier DS-CDMA Using OVSF Codes Assisted Space-Time Spreading in Time-Selective Fading Channels. IET Proceeedings Communications, 2, (5), 708-719.

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Description/Abstract

A downlink (base-to-mobile) multicarrier direct-sequence code-division multiple-access (MC DS-CDMA) system employing multiple antennas at both the base-station (BS) and each of the mobile terminals (MTs) is investigated, when communicating over fast time-varying fading channels resulting in time-selective fading. In the considered multiantenna MC DS-CDMA, space-time spreading (STS) based on the family of orthogonal variable spreading factor (OVSF) codes is proposed in order to achieve the time-diversity due to the time-selective fading, in addition to the transmit/receive diversity. In this contribution we derive the closed-form expressions for the single-user bit error rate (BER), in order to gain insight into the achievable BER performance of the multiantenna MC DS-CDMA. The BER performance of the multiantenna MC DS-CDMA system is investigated when communicating over correlated time-selective Rayleigh fading channels. Our study and performance results show that the multiantenna MC DS-CDMA using OVSF codes assisted STS constitutes a high-efficiency downlink space-time transmission scheme. It is capable of achieving the full diversity provided by the time-selective fading and multiple transmit/receive antennas. Furthermore, the proposed multiantenna MC DS-CDMA is capable of achieving a self-balance between the time-diversity achieved and the multiuser interference (MUI) suppression capability, when using low-complexity correlation detection.

Item Type: Article
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science > Comms, Signal Processing & Control
ePrint ID: 265937
Date Deposited: 13 Jun 2008 10:10
Last Modified: 27 Mar 2014 20:11
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/265937

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