Coherent and Differential Downlink Space-Time Steering Aided Generalised Multicarrier DS-CDMA


El-Hajjar, Mohammed, Hu, B, Yang, L-L and Hanzo, L (2007) Coherent and Differential Downlink Space-Time Steering Aided Generalised Multicarrier DS-CDMA IEEE Transactions on Wireless Communications, 6, (11), pp. 3857-3863.

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Description/Abstract

This paper presents a generalised MultiCarrier Direct Sequence Code Division Multiple Access (MC DS-CDMA) system invoking smart antennas for improving the achievable performance in the downlink. In this contribution, the MC DSCDMA transmitter employs an Antenna Array (AA) and Steered Space-Time Spreading (SSTS). Furthermore, the proposed system employs both Time and Frequency (TF) domain spreading for extending the capacity of the system, which is combined with a user-grouping technique for reducing the effects of Multi-User Interference (MUI). Moreover, to eliminate the high complexity Multiple Input Multiple Output (MIMO) channel estimation required for coherent detection, we also propose a Differential SSTS (DSSTS) scheme. More explicitly, for coherent SSTS detection MVNr number of channel estimates have to be generated, where M is the number of transmit AAs, V is the number of subcarriers and Nr is the number of receive antennas. This is a challenging task, which renders the low-complexity DSSTS scheme attractive. Index Terms—MIMO, MC DS-CDMA, beamforming, spacetime spreading, differential space-time spreading.

Item Type: Article
Organisations: Southampton Wireless Group
ePrint ID: 264958
Date :
Date Event
November 2007Published
Date Deposited: 12 Dec 2007 17:07
Last Modified: 17 Apr 2017 19:28
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/264958

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