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Differentially Coherent Code Acquisition in the MIMO-Aided Multi-Carrier DS-CDMA Downlink

Differentially Coherent Code Acquisition in the MIMO-Aided Multi-Carrier DS-CDMA Downlink
Differentially Coherent Code Acquisition in the MIMO-Aided Multi-Carrier DS-CDMA Downlink
Both differentially coherent and non-coherent code acquisition schemes designed for the multiple-input multiple-output (MIMO)-aided multi-carrier (MC)-DS-CDMA downlink are analysed, when communicating over uncorrelated Rayleigh channels. The attainable mean acquisition time (MAT) performance is studied as a function of both the number of multiple transmit/multiple receive antennas and that of the number of subcarriers. It is demonstrated that in contrast to the expectations, when the number of multiple transmit antennas and/or that of the subcarriers is increased in both the differentially coherent and the non-coherent code acquisition scenarios, the achievable MAT deteriorates over the entire signal-to-interference plus noise ratio (SINR) per chip (Ec/Io) range considered, except for the scenario of single-carrier (SC)-DS-CDMA using P ¼ 2 transmit antennas and R ¼ 1 receive antenna. As expected, the degree of performance degradation depends upon the specific scheme and the Ec/Io ratio considered, although paradoxically, the correctly synchronised MIMO-aided system is capable of attaining its target bit error ratio performance at reduced SINR values.
662 -670
Won, S.H.
94aa28df-1f44-47cf-b2f8-9cda2a143616
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Won, S.H.
94aa28df-1f44-47cf-b2f8-9cda2a143616
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1

Won, S.H. and Hanzo, L. (2007) Differentially Coherent Code Acquisition in the MIMO-Aided Multi-Carrier DS-CDMA Downlink. IET Communications, 1 (4), 662 -670.

Record type: Article

Abstract

Both differentially coherent and non-coherent code acquisition schemes designed for the multiple-input multiple-output (MIMO)-aided multi-carrier (MC)-DS-CDMA downlink are analysed, when communicating over uncorrelated Rayleigh channels. The attainable mean acquisition time (MAT) performance is studied as a function of both the number of multiple transmit/multiple receive antennas and that of the number of subcarriers. It is demonstrated that in contrast to the expectations, when the number of multiple transmit antennas and/or that of the subcarriers is increased in both the differentially coherent and the non-coherent code acquisition scenarios, the achievable MAT deteriorates over the entire signal-to-interference plus noise ratio (SINR) per chip (Ec/Io) range considered, except for the scenario of single-carrier (SC)-DS-CDMA using P ¼ 2 transmit antennas and R ¼ 1 receive antenna. As expected, the degree of performance degradation depends upon the specific scheme and the Ec/Io ratio considered, although paradoxically, the correctly synchronised MIMO-aided system is capable of attaining its target bit error ratio performance at reduced SINR values.

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Published date: August 2007
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 264577
URI: http://eprints.soton.ac.uk/id/eprint/264577
PURE UUID: 13142c8e-3b0d-4087-8833-77451116554a
ORCID for L. Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

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Date deposited: 23 Sep 2007
Last modified: 07 Oct 2020 01:33

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Contributors

Author: S.H. Won
Author: L. Hanzo ORCID iD

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