Turbo Packet Combining for Broadband Space-Time BICM Hybrid-ARQ Systems with Co-Channel Interference

In this paper, efficient turbo packet combining for single carrier (SC) broadband multiple-input--multiple-output (MIMO) hybrid--automatic repeat request (ARQ) transmission with unknown co-channel interference (CCI) is studied. We propose a new frequency domain soft minimum mean square error (MMSE)-based signal level combining technique where received signals and channel frequency responses (CFR)s corresponding to all retransmissions are used to decode the data packet. We provide a recursive implementation algorithm for the introduced scheme, and show that both its computational complexity and memory requirements are quite insensitive to the ARQ delay, i.e., maximum number of ARQ rounds. Furthermore, we analyze the asymptotic performance, and show that under a sum-rank condition on the CCI MIMO ARQ channel, the proposed packet combining scheme is not interference-limited. Simulation results are provided to demonstrate the gains offered by the proposed technique.Comment: 12 pages, 7 figures, and 2 table

Revisiting monotop production at the LHC

Scenarios of new physics where a single top quark can be produced in association with large missing energy (monotop) have been recently studied both from the theoretical point of view and by experimental collaborations. We revisit the originally proposed monotop setup by embedding the effective couplings of the top quark in an SU(2)L invariant formalism. We show that minimality selects one model for each of the possible production mechanisms: a scalar field coupling to a right-handed top quark and an invisible fermion when the monotop system is resonantly produced, and a vector field mediating the interactions of a dark sector to right-handed quarks for the non-resonant production mode. We study in detail constraints on the second class of scenarios, originating from contributions to standard single top processes when the mediator is lighter than the top quark and from the dark matter relic abundance when the mediator is heavier than the top quark.Comment: 24 pages, 7 figures; version accepted by JHE

Finalité de l’adhésion des organismes employeurs au dispositif DAIP via la nature des postes occupés et le type de difficultés rencontrées par les jeunes diplômés insérés

The position of employment in Algeria has been shaped by different factors, for instance; the unemployment of university graduates and other graduates from colleges and institutes. In fact, due to the generalization of the teaching- learning policy at university; there has been an emergence of a great number of heterogeneous graduates looking for employment. Actually, the economic context, in Algeria, is unable to face and enroll all applicants because some streams are not necessarily looked for by employers and recruiting companies. That’s why many university graduates suffer from redundancy, these include (historians, psychologists, sociologists…etc). It’s obvious that there is a gap between the training policy and the real needs of the economic sector in terms of skills and savoir-faire in general; this is why some companies complain about the lack of qualified staff. So as to satisfy their economic needs, the leaders of those companies don’t hesitate to get in touch with some employment service agencies such as ANEM (in charge of directing the DAIP system). This case study aims to answer and find out the purpose behind joining this employment device by those companies. Is it aimed at economic revival and succession? Or finding a new generation of workers, company leaders’ through transmitting knowledge and savoir-faire? Or is it simply to avoid extra charges related to adaptation of new workers? La situation de l’emploi en Algérie est caractérisée par plusieurs phénomènes entre autres, le chômage des universitaires et des diplômés en général. En effet, l’université, à la faveur de la démocratisation de l’enseignement, a mis sur le marché de l’emploi des milliers d’universitaires de formations hétéroclites. Il va de soi que l’économie algérienne en général ne peut absorber toutes les promotions d’universitaires, d’autant plus que certaines filières ne sont pas forcément recherchées par les entreprises et souffrent d’in employabilité (historiens, psychologues, sociologues…etc). Il est certain, qu’il y’a un décalage entre les formations assurées et les besoins réels de l’économie en termes de savoir, de savoir-faire et savoir être en général. Sur ce côté, les entreprises se plaignent d’un manque de personnel qualifié. Pour combler leur manque de personnel, les dirigeants des organismes employeurs n’hésitent pas à faire appel aux intermédiaires de l’emploi dont l’ANEM, l’agence chargée de la gestion du dispositif DAIP. Dans ce travail nous nous somme interroger : Est-ce-que l’objectif de leur adhésion est la recherche de garantir la succession de leur effectif par le transfert de connaissances entre générations ou c’est uniquement d’éviter des frais liés à l’adaptation 

L’intégration linguistique et sociale des immigrants d’origine algérienne à Montréal

My thesis deals with the integration of Algerian immigrants in Montreal in relation to their linguistic practices and attitudes. More concretely, it intends to raise the following main issue: Algerian immigrants are francophones, and Quebec builds its integration policy on the French language; however, these immigrants seem to be the least integrated in the province. This leads one to ask an important question: is mastering the host country’s language a sufficient condition for the integration of immigrants? I approach this issue under the angles of two disciplines which are Linguistic Anthropology and Immigration studies. Through a methodology based on a deep and continuous immersion, the aim of my study is to report on the mode and the degree of adaptation of Algerian immigrants to the Quebecois society. In this way, I plan to contribute in shedding light on the problematic of cultural diversity and coexistence of different communities. Moreover, my study is interesting because it deals with a theme that is not yet much researched as Algerian immigration to Quebec is quite recent. My study shows that both the Quebec government and the Algerian immigrants are making efforts towards the integration of these migrants. Although the latter still face problems of unemployment, discrimination and cultural adaptation, their activities in different domains attest that they have come to Quebec with a will to stay. The success of their integration requires the overcoming of the prejudices that they and the host society have towards each other