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Reduced-Complexity Maximum-Likelihood Detection in Downlink SDMA Systems

Reduced-Complexity Maximum-Likelihood Detection in Downlink SDMA Systems
Reduced-Complexity Maximum-Likelihood Detection in Downlink SDMA Systems
The literature of up-link SDMA systems is rich, but at the time of writing there is a paucity of information on the employment of SDMA techniques in the down-link. Hence, in this paper a Space Division Multiple Access (SDMA) down-link (DL) multi-user communication system invoking a novel low-complexity Maximum Likelihood (ML) space-time detection technique is proposed, which can be regarded as an advanced extension of the Complex Sphere Decoder (CSD). We demonstrate that as opposed to the previously published variants of the CSD, the proposed technique may be employed for obtaining a high effective throughput in the so-called “over-loaded” scenario, where the number of transmit antennas exceeds that of the receive antennas. The proposed method achieves the optimum performance of the ML detector even in heavily over-loaded scenarios, while the associated computational complexity is only moderately increased. As an illustrative example, the required Eb/N0 increased from 2 dB to 9 dB, when increasing the normalized system load from unity, representing the fully loaded system, to a normalized load of 1.556.
5 pages
Akhtman, J.
d4fd2b26-c123-463d-847c-80adc83a89fa
Wei, C.Y.
a8cbdf52-ebba-4154-9055-1e9768e2ab88
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Akhtman, J.
d4fd2b26-c123-463d-847c-80adc83a89fa
Wei, C.Y.
a8cbdf52-ebba-4154-9055-1e9768e2ab88
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1

Akhtman, J., Wei, C.Y. and Hanzo, L. (2006) Reduced-Complexity Maximum-Likelihood Detection in Downlink SDMA Systems. IEEE VTC'06 (Fall), Montreal, Canada. 25 - 28 Sep 2006. 5 pages .

Record type: Conference or Workshop Item (Paper)

Abstract

The literature of up-link SDMA systems is rich, but at the time of writing there is a paucity of information on the employment of SDMA techniques in the down-link. Hence, in this paper a Space Division Multiple Access (SDMA) down-link (DL) multi-user communication system invoking a novel low-complexity Maximum Likelihood (ML) space-time detection technique is proposed, which can be regarded as an advanced extension of the Complex Sphere Decoder (CSD). We demonstrate that as opposed to the previously published variants of the CSD, the proposed technique may be employed for obtaining a high effective throughput in the so-called “over-loaded” scenario, where the number of transmit antennas exceeds that of the receive antennas. The proposed method achieves the optimum performance of the ML detector even in heavily over-loaded scenarios, while the associated computational complexity is only moderately increased. As an illustrative example, the required Eb/N0 increased from 2 dB to 9 dB, when increasing the normalized system load from unity, representing the fully loaded system, to a normalized load of 1.556.

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Published date: 2006
Additional Information: Event Dates: 25-28 September 2006
Venue - Dates: IEEE VTC'06 (Fall), Montreal, Canada, 2006-09-25 - 2006-09-28
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 263040
URI: http://eprints.soton.ac.uk/id/eprint/263040
PURE UUID: ca10e4a5-a60a-4ac8-b286-130c30fa2e6d
ORCID for L. Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 03 Oct 2006
Last modified: 20 Jul 2019 01:26

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