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You searched for +publisher:"University of Notre Dame" +contributor:("J. Nicholas Laneman, Research Director"). Showing records 1 – 2 of 2 total matches.

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University of Notre Dame

1. Mingming Cai. Modeling and Mitigating Beam Squint in Millimeter Wave Wireless Communication</h1>.

Degree: PhD, Electrical Engineering, 2018, University of Notre Dame

There has been increasing demand for accessible radio spectrum with the rapid development of mobile wireless devices and applications. For example, a GHz of spectrum is needed for fifth-generation (5G) cellular communication, but the available spectrum below 6 GHz cannot meet such requirements. Fortunately, spectrum at higher frequencies, in particular, millimeter-wave (mmWave) bands, can be utilized through phased-array analog beamforming to provide access to large amounts of spectrum. However, the gain provided by a phased array is frequency dependent in the wideband system, an effect called beam squint. We examine the nature of beam squint and develop convenient models with either a uniform linear array (ULA) or a uniform planar array (UPA). Analysis shows that beam squint decreases channel capacity, and therefore, path selection should take beam squint into consideration. Current channel estimation algorithms assume no beam squint, and channel estimation error is increased by the beam squint, further decreasing the channel capacity. Three problems involving phased-array beamforming are studied to incorporate and compensate for beam squint. First, we show that carrier aggregation can be used to improve system throughput to a point. We study the optimal beam alignment to maximize channel capacity, and demonstrate that, with sufficient band separation, focusing on only one band outperforms carrier aggregation. Approximations are developed for a system with two symmetric bands to determine the critical values of system parameters like band separation, and angle of arrival beyond which it is preferable not to aggregate. Second, beamforming codebooks are designed to compensate for one-sided beam squint by imposing a channel capacity constraint. Analysis and numerical examples suggest that a denser codebook is required compared to the case without beam squint, and the codebook size increases as bandwidth or the number of antennas in the array increases and diverges as either of these parameters exceeds certain limits. Third, to decouple the transmitter and receiver arrays with two-sided beam squint, and to extend conventional codebook design algorithms, codebooks with a minimum array gain constraint for all frequencies and angles of arrival or departure are also designed to compensate for the beam squint. Again, either the bandwidth or the number of antennas in the array is limited by the effects of beam squint if the other one is fixed. Advisors/Committee Members: J. Nicholas Laneman, Research Director.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Cai, M. (2018). Modeling and Mitigating Beam Squint in Millimeter Wave Wireless Communication</h1>. (Doctoral Dissertation). University of Notre Dame. Retrieved from https://curate.nd.edu/show/x346d22100m

Chicago Manual of Style (16th Edition):

Cai, Mingming. “Modeling and Mitigating Beam Squint in Millimeter Wave Wireless Communication</h1>.” 2018. Doctoral Dissertation, University of Notre Dame. Accessed January 22, 2019. https://curate.nd.edu/show/x346d22100m.

MLA Handbook (7th Edition):

Cai, Mingming. “Modeling and Mitigating Beam Squint in Millimeter Wave Wireless Communication</h1>.” 2018. Web. 22 Jan 2019.

Vancouver:

Cai M. Modeling and Mitigating Beam Squint in Millimeter Wave Wireless Communication</h1>. [Internet] [Doctoral dissertation]. University of Notre Dame; 2018. [cited 2019 Jan 22]. Available from: https://curate.nd.edu/show/x346d22100m.

Council of Science Editors:

Cai M. Modeling and Mitigating Beam Squint in Millimeter Wave Wireless Communication</h1>. [Doctoral Dissertation]. University of Notre Dame; 2018. Available from: https://curate.nd.edu/show/x346d22100m


University of Notre Dame

2. Nikolaus G. Kleber. Analysis of CSIR for an OFDM System Limited by a Frequency-Hopping Interferer</h1>.

Degree: MSin Electrical Engineering, Electrical Engineering, 2015, University of Notre Dame

This thesis explores an OFDM communication system in the presence of a unsophisticated frequency-hopping interferer. Information theory is used to explore the fundamental limits of system performance with varying degrees of knowledge about the state of the interferer. In particular, the Shannon channel capacity of the system is derived for two different cases of channel state information at the receiver (CSIR), namely Perfect CSIR and Partial CSIR. An approximation of the Shannon channel capacity via Monte Carlo techniques is also made for the case of No CSIR for comparison. The gains in signal-to-noise ratio (SNR) obtained by Partial and Perfect CSIR for various interference powers are considered. The results show a trade-off between computational complexity and the gains in SNR. Next, practical implementations of the system that approach the channel capacity are explored. The bit error rate (BER) of these systems is simulated as a function of SNR with various interference powers. Finally, an analysis is performed to compare the BER of the practical systems against the theoretic channel capacities found earlier. The results indicate that a practical system can obtain gains similar to those found from information theory. Advisors/Committee Members: Thomas E. Fuja, Committee Member, J. Nicholas Laneman, Research Director, Bertrand Hochwald, Committee Member.

Subjects/Keywords: Interference-Limited Communication

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Kleber, N. G. (2015). Analysis of CSIR for an OFDM System Limited by a Frequency-Hopping Interferer</h1>. (Masters Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/pz50gt5710z

Chicago Manual of Style (16th Edition):

Kleber, Nikolaus G.. “Analysis of CSIR for an OFDM System Limited by a Frequency-Hopping Interferer</h1>.” 2015. Masters Thesis, University of Notre Dame. Accessed January 22, 2019. https://curate.nd.edu/show/pz50gt5710z.

MLA Handbook (7th Edition):

Kleber, Nikolaus G.. “Analysis of CSIR for an OFDM System Limited by a Frequency-Hopping Interferer</h1>.” 2015. Web. 22 Jan 2019.

Vancouver:

Kleber NG. Analysis of CSIR for an OFDM System Limited by a Frequency-Hopping Interferer</h1>. [Internet] [Masters thesis]. University of Notre Dame; 2015. [cited 2019 Jan 22]. Available from: https://curate.nd.edu/show/pz50gt5710z.

Council of Science Editors:

Kleber NG. Analysis of CSIR for an OFDM System Limited by a Frequency-Hopping Interferer</h1>. [Masters Thesis]. University of Notre Dame; 2015. Available from: https://curate.nd.edu/show/pz50gt5710z

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