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Initial and post-initial code acquisition in the noncoherent multiple-input/multiple-output-aided DS-CDMA downlink

Initial and post-initial code acquisition in the noncoherent multiple-input/multiple-output-aided DS-CDMA downlink
Initial and post-initial code acquisition in the noncoherent multiple-input/multiple-output-aided DS-CDMA downlink
In this paper, we investigate the issues of both initial and post-initial acquisition schemes in the multiple-input/multiple-output (MIMO)-aided direct-sequence code-division multiple-access (DS-CDMA) downlink when communicating over spatially uncorrelated Rayleigh channels. The associated mean acquisition time (MAT) performance trends are characterized as a function of the number of MIMO elements. Furthermore, we characterize both the initial and post-initial acquisition performance as a function of the relevant system parameters. Our findings suggest that increasing the number of transmit antennas in a MIMO-aided CDMA system results in combining the low-energy noise-contaminated signals of the transmit antennas, which ultimately increases the MAT by an order of magnitude when the signal-to-interference-plus-noise ratio (SINR) is relatively low, regardless of whether single- or multipath scenarios are considered. This phenomenon has a detrimental effect on the performance of Rake-receiver-based synchronization schemes when the perfectly synchronized system is capable of attaining its target bit-error-rate performance at reduced SINR values, as a benefit of employing multiple transmit antennas. Based on our analysis justified by information-theoretic considerations, our acquisition design guidelines are applicable to diverse noncoherent (NC) MIMO-assisted scenarios.
0018-9545
2322-2330
Won, Seung
3b1fcfcf-6f8b-49b3-889b-7f6cdb58978b
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Won, Seung
3b1fcfcf-6f8b-49b3-889b-7f6cdb58978b
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Won, Seung and Hanzo, Lajos (2009) Initial and post-initial code acquisition in the noncoherent multiple-input/multiple-output-aided DS-CDMA downlink. IEEE Transactions on Vehicular Technology, 58 (5), 2322-2330. (doi:10.1109/TVT.2008.2007461).

Record type: Article

Abstract

In this paper, we investigate the issues of both initial and post-initial acquisition schemes in the multiple-input/multiple-output (MIMO)-aided direct-sequence code-division multiple-access (DS-CDMA) downlink when communicating over spatially uncorrelated Rayleigh channels. The associated mean acquisition time (MAT) performance trends are characterized as a function of the number of MIMO elements. Furthermore, we characterize both the initial and post-initial acquisition performance as a function of the relevant system parameters. Our findings suggest that increasing the number of transmit antennas in a MIMO-aided CDMA system results in combining the low-energy noise-contaminated signals of the transmit antennas, which ultimately increases the MAT by an order of magnitude when the signal-to-interference-plus-noise ratio (SINR) is relatively low, regardless of whether single- or multipath scenarios are considered. This phenomenon has a detrimental effect on the performance of Rake-receiver-based synchronization schemes when the perfectly synchronized system is capable of attaining its target bit-error-rate performance at reduced SINR values, as a benefit of employing multiple transmit antennas. Based on our analysis justified by information-theoretic considerations, our acquisition design guidelines are applicable to diverse noncoherent (NC) MIMO-assisted scenarios.

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More information

e-pub ahead of print date: 31 October 2008
Published date: July 2009
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 267780
URI: https://eprints.soton.ac.uk/id/eprint/267780
ISSN: 0018-9545
PURE UUID: acc43aae-084f-4b4a-a591-8f13a4f804c1
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 14 Aug 2009 07:09
Last modified: 20 Jul 2019 01:26

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