Monograph records
https://feeds.library.caltech.edu/people/Schulman-L-J/monograph.rss
A Caltech Library Repository Feedhttp://www.rssboard.org/rss-specificationpython-feedgenenTue, 16 Apr 2024 14:15:06 +0000Microcellular Systems, Random Walks, and Wave Propagation
https://resolver.caltech.edu/CaltechPARADISE:2002.ETR045
Authors: {'items': [{'id': 'Franceschetti-M', 'name': {'family': 'Franceschetti', 'given': 'Massimo'}}, {'id': 'Bruck-J', 'name': {'family': 'Bruck', 'given': 'Jehoshua'}, 'orcid': '0000-0001-8474-0812'}, {'id': 'Schulman-L-J', 'name': {'family': 'Schulman', 'given': 'Leonard J.'}, 'orcid': '0000-0001-9901-2797'}]}
Year: 2002
As the number of users of wireless services increases, the concept of using smaller
cell sizes becomes especially attractive because of its potential for capacity increase.
Current technology allows to build base stations for small cells in a cost effective
way, and telecommunication companies have started exploiting the new microcellular
concept in providing coverage to densely populated areas. Prediction of propagation
characteristics in this new scenario is essential for accurate link budget calculations in
network planning.
In this paper a new, simple model of wave propagation for microcellular systems
is applied to predict the path loss of a wireless channel. The model does not rely on
the classical theory of electromagnetic wave propagation, but it is entirely based on
probability theory. We consider the canonical scenario of a random environment of
partially absorbing scatterers and model the trajectory of each photon in the system
as a random walk. This model leads to a path loss formula that rather accurately (in comparison to other models and experimental data) describes the smooth transition
of power attenuation from an inverse square law with the distance to the transmitter
to an exponential attenuation as this distance is increased. This result can justify
empirical formulas that are often used for path loss prediction, characterized by a
breakpoint distance at which the exponent of a power law is increased from a value of
approximately 2 to a value in the range of 4 to 10.
Theoretical predictions of the model are validated by showing agreement with experimental data collected in the city of Rome, Italy.https://authors.library.caltech.edu/records/1ryzf-n1606Cryptography from tensor problems
https://resolver.caltech.edu/CaltechAUTHORS:20120713-075312396
Authors: {'items': [{'id': 'Schulman-L-J', 'name': {'family': 'Schulman', 'given': 'Leonard J.'}, 'orcid': '0000-0001-9901-2797'}]}
Year: 2012
We describe a new proposal for a trap-door one-way function. The new proposal belongs to the "multivariate quadratic" family but the trap-door is different from existing methods, and is simpler.https://authors.library.caltech.edu/records/8qd5x-9v245An MQ/Code Cyptosystem Proposal
https://resolver.caltech.edu/CaltechAUTHORS:20140130-133600557
Authors: {'items': [{'id': 'Schulman-L-J', 'name': {'family': 'Schulman', 'given': 'Leonard J.'}, 'orcid': '0000-0001-9901-2797'}]}
Year: 2013
We describe a new trap-door (and PKC) proposal. The proposal is ``multivariate quadratic'' (relies on the hardness of solving systems of quadratic equations); it is also code-based, and uses the code-scrambling technique of McEliece (1978). However, in the new proposal, the error-correcting code is not revealed in the public key, which protects against the leading attacks on McEliece's method.https://authors.library.caltech.edu/records/kmjbn-35b51