Wireless Channel Estimation With Applications to Secret Key Generation

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dc.contributor.authorMovahedian, Alireza
dc.contributor.supervisorMcGuire, Michael Liam
dc.date.accessioned2014-10-14T22:24:08Z
dc.date.available2014-10-14T22:24:08Z
dc.date.copyright2014en_US
dc.date.issued2014-10-14
dc.degree.departmentDepartment of Electrical and Computer Engineering
dc.degree.levelDoctor of Philosophy Ph.D.en_US
dc.description.abstractThis research investigates techniques for iterative channel estimation to maximize channel capacity and communication security. The contributions of this dissertation are as follows: i) An accurate, low-complexity approach to pilot-assisted fast-fading channel estimation for single-carrier modulation with a turbo equalizer and a decoder is proposed. The channel is estimated using a Kalman filter (KF) followed by a zero-phase filter (ZPF) as a smoother. The combination of the ZPF with the KF of the channel estimator makes it possible to reduce the estimation error to near the Wiener bound. ii) A new semi-blind channel estimation technique is introduced for multiple-input-multiple-output channels. Once the channel is estimated using a few pilots, a low-order KF is employed to progressively predict the channel gains for the upcoming blocks. iii) The capacity of radio channels is investigated when iterative channel estimation, data detection, and decoding are employed. By taking the uncertainty in decoded data bits into account, the channel Linear Minimum Mean Square Error (LMMSE) estimator of an iterative receiver with a given pilot ratio is obtained. The derived error value is then used to derive a bound on capacity. It is shown that in slow fading channels, iterative processing provides only a marginal advantage over non-iterative approach to channel estimation. Knowing the capacity gain from iterative processing versus purely pilot-based channel estimation helps a designer to compare the performance of an iterative receiver against a non-iterative one and select the best balance between performance and cost. iv) A Radio channel is characterized by random parameters which can be used to generate shared secret keys by the communicating parties when the channel is estimated. This research studies upper bounds on the rate of the secret keys extractable from iteratively estimated channels. Various realistic scenarios are considered where the transmission is half-duplex and/or the channel is sampled under the Nyquist rate. The effect of channel sampling interval, fading rate and noise on the key rate is demonstrated. The results of this research can be beneficial for the design and analysis of reliable and secure mobile wireless systems.en_US
dc.description.proquestcode0544en_US
dc.description.scholarlevelGraduateen_US
dc.identifier.bibliographicCitationMovahedian, A.; McGuire, M., "An Iterative Receiver for Fast Fading Channels Using Two Kalman Filters," Broadband and Wireless Computing, Communication and Applications (BWCCA), 2011 International Conference on , vol., no., pp.122,127, 26-28 Oct. 2011 doi: 10.1109/BWCCA.2011.23en_US
dc.identifier.bibliographicCitationMovahedian, A.; McGuire, M., "On the Capacity of Iteratively Estimated Channels Using LMMSE Estimators," Vehicular Technology, IEEE Transactions on , vol.PP, no.99, pp.1,1 doi: 10.1109/TVT.2014.2320928en_US
dc.identifier.bibliographicCitationMcGuire, M.; Movahedian, A.; Sima, M., "Zero phase smoothing of radio channel estimates," Signal Processing Conference (EUSIPCO), 2012 Proceedings of the 20th European , vol., no., pp.1608,1612, 27-31 Aug. 2012en_US
dc.identifier.bibliographicCitationMovahedian, A.; McGuire, M., "Capacity of iteratively estimated channels using LMMSE estimators," Communications, Computers and Signal Processing (PACRIM), 2013 IEEE Pacific Rim Conference on , vol., no., pp.200,205, 27-29 Aug. 2013 doi: 10.1109/PACRIM.2013.6625474en_US
dc.identifier.bibliographicCitationMovahedian, A.; McGuire, M., "Low complexity estimation of fast fading radio channels for higher order modulation," Communications (ICC), 2013 IEEE International Conference on , vol., no., pp.5537,5541, 9-13 June 2013 doi: 10.1109/ICC.2013.6655473en_US
dc.identifier.bibliographicCitationMovahedian, A.; McGuire, M., "Estimation of Fast-Fading Channels for Turbo Receivers With High-Order Modulation," Vehicular Technology, IEEE Transactions on , vol.62, no.2, pp.667,678, Feb. 2013 doi: 10.1109/TVT.2012.2227345en_US
dc.identifier.bibliographicCitationMcGuire, M.; Movahedian, A., "Bounds on secret key rates in fading channels under practical channel estimation schemes," Communications (ICC), 2014 IEEE International Conference on , vol., no., pp.737,742, 10-14 June 2014 doi: 10.1109/ICC.2014.6883407en_US
dc.identifier.urihttp://hdl.handle.net/1828/5702
dc.languageEnglisheng
dc.language.isoenen_US
dc.rights.tempAvailable to the World Wide Weben_US
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/*
dc.subjectWireless networksen_US
dc.subjectSecret key generationen_US
dc.subjectChannel estimationen_US
dc.subjectKalman filteren_US
dc.subjectMIMO channelsen_US
dc.subjectWireless channel capacityen_US
dc.subjectTurbo equalizationen_US
dc.subjectPhysical-layer securityen_US
dc.subjectMIMO-OFDMen_US
dc.titleWireless Channel Estimation With Applications to Secret Key Generationen_US
dc.typeThesisen_US

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