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Downlink Steered Space-Time Spreading For Multi-Carrier Transmission Over Frequency Selective Channels

Sahal, N., El Hajjar, Mohammed and Hanzo, Lajos (2008) Downlink Steered Space-Time Spreading For Multi-Carrier Transmission Over Frequency Selective Channels At IEEE VTC'08 (Spring), Singapore. 11 - 14 May 2008. , pp. 943-947.

Record type: Conference or Workshop Item (Paper)


This paper presents a novel amalgam of Steered Space-Time Spreading (SSTS) and Orthogonal Frequency Division Multiple Access (OFDMA) designed for attaining both spatial diversity gain and beamforming gain for transmission over OFDM-symbol-invariant frequency selective channels. We propose a flexible technique for increasing the number of users beyond the number of chips in the spreading sequence employed by the SSTS scheme with the aid of the multiple carriers of OFDMA, which requires an extended bandwidth. However, employing a separate low-complexity SSTS detector combined with another separate OFDMA detector is potentially less complex than a single detector designed for detecting all the users supported in a single domain, regardless whether the singledomain Multi-User Detector (MUD) is an SSTS or OFDMA MUD. This is because the MUD’s complexity tends to increase exponentially with the number of users detected. The SSTSOFDMA system is benchmarked against its counterpart using S-depth Frequency Domain (FD) repetition, which increases the FD diversity order at the cost of reducing the overall throughput by a factor of S. Fortunately, a similar FD diversity gain may be achieved without a factor-S reduction in the throughput, when using FD spreading and assigning all the superimposed FD spreading codes to the same user.

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Published date: May 2008
Additional Information: Event Dates: 11-14 May 2008
Venue - Dates: IEEE VTC'08 (Spring), Singapore, 2008-05-11 - 2008-05-14
Organisations: Southampton Wireless Group


Local EPrints ID: 265905
PURE UUID: 48ba39bf-a586-4141-8048-518f88f69c7e
ORCID for Mohammed El Hajjar: ORCID iD

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Date deposited: 11 Jun 2008 13:57
Last modified: 18 Jul 2017 07:22

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Author: N. Sahal
Author: Mohammed El Hajjar ORCID iD
Author: Lajos Hanzo

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