Learn More
The wireless medium being inherently broadcast in nature and hence prone to interferences requires highly optimized medium access control (MAC) protocols. This holds particularly true for wireless sensor networks (WSNs) consisting of a large amount of miniaturized battery-powered wireless networked sensors required to operate for years with no human(More)
In this paper, we study the application of physical layer network coding to the joint design of uplink and downlink transmissions, where the base station and the relay have multiple antennas, and all mobile stations only have a single antenna. A new network coding transmission protocol is proposed, where uplink and downlink transmissions can be accomplished(More)
We propose and analyze a resource allocation algorithm, referred to as the Enhanced Staggered Resource Allocation (ESRA) method, for downlink and uplink in fixed broadband wireless networks with directional antennas at base stations and terminals. The new method is based on the Staggered Resource Allocation (SRA) algorithm proposed in [FHLQS98] with(More)
We describe a new algorithm for calculating blocking probabilities and other steady-state characteristics in a large class of product-forin loss models, based on numerical inversion of the generating functions of the normalization constants (or partition functions). 'Mis algorithm provides the basis for computer-aided performance analysis of communication(More)
The invention relates to efficiently providing multiple grades of service, including protection against overloads, for multiple customers sharing limited resources, wherein “efficiently providing” includes (i) determining when a prospective new customer can be admitted with a desired grade of service, (ii) determining how to adjust capacity in face of(More)
This paper provides analytical expressions to evaluate the performance of a random access wireless network in terms of user throughput and network throughput, subject to the constraint of proportional fairness amongst users. The proportional fair scheduling (PFS) algorithm is considered an attractive bandwidth allocation criterion in wireless networks for(More)
This paper studies the diversity benefit of different interference alignment solutions. While most research about interference alignment was aiming at deriving or realizing the maximum achievable multiplexing gain, the symbol error rate performance, which can be characterized by the diversity gain is of equal importance. Different interference alignment(More)
In this paper, we introduce a deterministic fluid model and two stochastic traffic models for wireless networks. The setting is a highway with multiple entrances and exits. Vehicles are classified as calling or non-calling, depending on whether they have calls in progress. The deterministic model ignores the behavior of individual vehicles and treats them(More)
We consider a scenario where multiple pairs of users exchange information within pair, with the help of a dedicated multi-antenna relay. The protocol integrates the idea of analogue network coding in mixing two data streams originating from the same user pair, together with the spatial multiplexing of the data streams originating from different user pairs.(More)
Using the MPEG-4 advanced audio coder (AAC) music as an example of streaming applications, we investigate the improvement of error performance for the streaming service by link-adaptation and power-control techniques in an enhanced general packet radio services (EGPRS) cellular network. A low packet error rate and variability are essential in providing a(More)