Benoit Pelletier

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To reduce the complexity of space-time multiuser detection, it has been proposed recently to exploit the spatial dimension by forming groups of users and apply the detection individually to each group. In this work we propose a new space-time receiver structure based on the group-optimal MMSE linear detector along with a new grouping algorithm that respects(More)
To improve the bandwidth efficiency of current and future generations of wireless cellular systems, several techniques exist such as beamforming (BF) and multiuser detection (MUD). To reduce the complexity of the MUD, it has been proposed to separate users within a cell into mutually exclusive groups and perform MUD independently in each group. Inter-group(More)
LTE Device-to-device (D2D) discovery and communication has been considered a means to allow capacity offloading, range extension as well as commercial proximity services such as advertisement or social networking. Within this context, several service discovery approaches may be envisioned. In this paper, we study strategies which rely on a central function(More)
Direct Device-to-Device (D2D) communications in cellular systems has attracted a lot of interest for both commercial and public safety applications. To support D2D communications, a first step involving neighbor discovery is typically needed. This paper focuses on the study of neighbor discovery signal design aspects and interference management for D2D(More)
In this work we address the issues of probabilistic modelling of the decoding errors in hybrid ARQ (HARQ) rounds. In particular we i) claim that the assumption of independence of decoding errors, used implicitly in various works on this subject, is an approximation, and ii) propose equally simple but much more accurate method to calculate the probability of(More)
Vehicle-to-vehicle (V2V) communication has the potential to improve road safety significantly by providing connectivity between vehicles to exchange information messages. V2V has recently gained considerable attention in part due to the standardization work that has started for Long Term Evolution (LTE) under the Third Generation Partnership Project (3GPP).(More)
Device-to-Device (D2D) communications in cellular systems have a lot of potential value for both commercial and public safety (PS) applications. In D2D communications, two or more devices exchange data using a direct communication link, i.e., without having to go through the network infrastructure. This paper focuses on the study of broadcast voice(More)
Mobile communication systems based on DS-CDMA suffer from multiple access interference (MAI), which limits the system capacity. Several techniques, such as beamforming with multiple antennas and multiuser detection (MUD), have proved to be effective to mitigate MAI. To reduce the complexity of MUD, it has been proposed to process users in smaller groups.(More)
To ensure reliable communications in randomly varying and error-prone channels, wireless systems use adaptive modulation and coding (AMC) as well as hybrid ARQ (HARQ). In order to elucidate their compatibility and interaction, we compare the throughput provided by AMC, HARQ, and their combination (AMC-HARQ) under two operational conditions: in slow- and(More)
The arrival of new data services for wireless mobile communications requires an efficient use of the available bandwidth. Interference-limited cellular systems based on codedivision multiple access (CDMA) can benefit from multiuser detection (MUD) and beamforming with antenna array to reduce multiple-access interference. Group-based techniques have been(More)