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), 3857-3863 .
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.
|Divisions:||Faculty of Physical and Applied Science > Electronics and Computer Science > Comms, Signal Processing & Control
|Date Deposited:||12 Dec 2007 17:07|
|Last Modified:||01 Mar 2012 19:28|
|Contributors:||El-Hajjar, Mohammed (Author)
Hu, B (Author)
Yang, L-L (Author)
Hanzo, L (Author)
|Further Information:||Google Scholar|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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