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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.

Record type: Article


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.

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Published date: November 2007
Organisations: Southampton Wireless Group


Local EPrints ID: 264958
PURE UUID: f3426896-4f63-4cc9-ba35-24fc44b52dd4
ORCID for Mohammed El-Hajjar: ORCID iD
ORCID for L-L Yang: ORCID iD

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Date deposited: 12 Dec 2007 17:07
Last modified: 18 Jul 2017 07:31

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Author: Mohammed El-Hajjar ORCID iD
Author: B Hu
Author: L-L Yang ORCID iD
Author: L Hanzo

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