Department Seminars

September,28 2018 [ComNum seminar] Cloud Radio Access Networks, Distributed Information Bottleneck, and more

Seminar Author(s):

Shlomo Shamai (Technion, Israel)

Seminar description:


at 11am in F900,


Abstract:

We consider transmission over a cloud radio access network (CRAN) focusing
on the framework of oblivious processing at the relay nodes (radio units),
i.e., the relays are not cognizant of the users' codebooks.
This approach is motivated by future wireless communications
(5G and beyond) and the theoretical results connect to a variety
of different information theoretic models and problems.
First it is shown that relaying a-la Cover-El Gamal, i.e.,
compress-and-forward with joint decompression and
decoding, which reflects 'noisy network coding,' is optimal.
The penalty of obliviousness is also demonstrated to be
at most a constant gap, when compared to cut-set bounds.
Naturally, due to the oblivious (nomadic) constraint the CRAN problem
intimately connects to Chief Executive Officer (CEO) source(s) coding
under a logarithmic loss distortion measure.
Furthermore, we identify and elaborate on some interesting
connections with the distributed information bottleneck model for which we
characterize optimal tradeoffs between rates (i.e., complexity) and
information (i.e., accuracy) in the discrete and vector Gaussian frameworks.
Further connections to 'information combining' and 'common reconstruction'
are also pointed out. In the concluding outlook, some interesting problems
are mentioned such as the characterization of the optimal input distributions
under users' power limitations and rate-constrained compression at the
relay nodes,

 


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Joint work with: I.E. Aguerri (Paris Research Center, Huawei France)
A. Zaidi (Universite Paris-Est, Paris) and G. Caire (USC-LA and TUB, Berlin)
The research is supported by the European Union's Horizon 2020 Research And
Innovation Programme: no. 694630.

Contact(s):

Wigger Michele

September,13 2018 Secure all your passwords with pass and tomb

Seminar Author(s):

Pacalet Renaud

Seminar description:

tomb (Linux only) is a cryptographic utility based on the Linux Unified Key Setup (LUKS) 
standard and the disk encryption subsystem of Linux kernel (dm-crypt device mapper). 
It can be used to encrypt directories, turning them into binary files. 
It is very well designed and easy to use. pass is a password manager with many interesting 
characteristics. It is open source, does not rely on third party (more or less trustable) 
servers, integrated with git and tomb, supported by Firefox / Chrome... extensions, etc. 
This seminar will briefly present these two tools and how they can be jointly used for 
the highest security of your personal data. Then, we will demonstrate them by installing 
all needed components, generating the keys and use them for real use cases.
 

Contact(s):

Pacalet Renaud

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