Benoit Pelletier

• Member of Technical Staff at InterDigital Canada Ltee

In distributed device-to-device (D2D) communications, no common reference time is available and the devices must employ distributed synchronization techniques. In this context, pulse-based synchronization, which can be implemented by distributed phase-locked loops is preferred due to its scalability. Several factors degrade the performance of pulse...

In this work, we consider transmissions over block fading channels and assume that adaptive modulation and coding (AMC) and hybrid automatic repeat request (HARQ) are implemented. Knowing that in high signal-to-noise ratio, the conventional combination of HARQ with AMC is counterproductive from the throughput point of view, we adopt the so-called l...

In this work, we consider transmissions over block fading channels and assume that adaptive modulation and coding (AMC) and hybrid automatic repeat request (HARQ) are implemented. Knowing that in high signal-to-noise ratio, the conventional combination of HARQ with AMC is counterproductive from the throughput point of view, we adopt the so-called l...

To ensure reliable communication 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-...

To ensure reliable communication 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-...

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 proba...

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...

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...

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...

The arrival of new data services for wireless mobile communications requires an efficient use of the available bandwidth. Interference-limited cellular systems based on code-division multiple access (CDMA) can benefit from multiuser detection (MUD) and beamforming with antenna array to reduce multiple-access interference. Group-based techniques hav...

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...

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 g...

The increase in the demand for voice and data wireless services creates a need for a more efficient use of the available bandwidth. Current and future generations cellular systems based on DS-CDMA are known to be interference- limited. Several approaches exist to mitigate the multiple access interference including multiuser detection (MUD). Group-b...

Multiuser detection (MUD) techniques are known to improve the performance of CDMA cellular communication systems. This performance improvement usually comes at a large computational cost. To reduce the complexity, it has been proposed recently to exploit the spatial dimension by grouping users in clusters and apply MUD individually to each group. T...

In this paper, we propose and study a generalized criterion for the canonical correlation decomposition (CCD) based estimation of multiple vector channels in ambient colored noise. In this approach, it is assumed that the desired signals are received by two separated antenna clusters, so that the output noise is spatially uncorrelated. The proposed...

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. Int...

The arrival of new multi-media and Internet services to mobile cellular subscribers has led to the development of new techniques, such as antenna array or smart antennas (SA), to improve spectrum efficiency. SA provides a means for spatial filtering for separating users based on angular characteristics, a method also known as beamforming. In this c...

In this paper, we consider the distortion created by an unmatched transmission line system at the receiver of a high-speed data radio. The distortion can be modeled using a few interdependent parameters, which are to be estimated. A joint maximum likelihood (ML) estimator for the parameters is presented with the corresponding Cramer-Rao bound (CRB)...

This work considers the distortion created by an unmatched transmission line system at the receiver of a military data radio. The installation requirements for these types of systems are such that manual tuning of the antenna is impracticable. The antenna impedance may not match that of the cable and radio receiver, resulting in electrical reflecti...