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Contractive interference functions introduced by Feyzmahdavian et al. is the newest approach in the analysis and design of distributed power control laws. This approach can be extended to several cases of distributed power control. One of the distributed power control scenarios wherein the contractive interference functions have not been employed is the power control in MIMO systems. In this paper,...
In this paper, the problem of Downlink Multi-User MIMO (DL MU-MIMO) transmission from two interfering transmitters, each equipped with M antennas to multiple users each equipped with K antennas is considered. It is assumed that all users receive a single data stream of rank one from only one of the transmitters. A novel transmission/reception scheme is proposed based on the idea of Interference Alignment...
A MIMO interference network with L users is investigated in this paper. We compare the sum-rate performance of interference management approaches applied to this network. The minimum mean square error (MMSE) algorithm optimizes the beamforming vectors by maximizing the signal-to-interference-plus-noise ratio (SINR). Another approach, minimum leakage interference alignment (ML-IA), minimizes the leakage...
The concept of interference alignment has been studied mainly from an information-theoretic and signal processing point of view, focusing on scenarios with a high degree of coordination among nodes often achieved by means of transmission scheduling. However, many real-world networks employ random access policies rather than deterministic scheduling, and it is therefore important to understand how...
This paper examines a type of linear beamforming for communications in interference networks. First, a receiver beamformer design is derived from a Maximum Likelihood (ML) framework with Automatic Gain Control (AGC) constraints. The studied beamformer keeps the complexity of the receiver low and it is able either to remove full coherent arrivals or to enhance them when required when different AGC...
We consider the Noisy MIMO Interference Channel (IFC) with linear transmitters and receivers and full CSI. The maximization of the Weighted Sum Rate (WSR) or transceiver design for Interference Alignment (IA) lead to cost functions with many local optima. Deterministic annealing is an approach that allows to track the variation of the known solution of one version of the problem into the unknown solution...
There are various systems using ISM (Industrial Science Medical) band, resulting in a potential for interference. To avoid interference effectively, interference analysis in ISM band is essential. Monte-Carlo method is mainly used for interference analysis among wireless communication systems. In this paper, we suggest a modified Monte-Carlo method which can calculate throughput to provide the effect...
In this paper, we investigate a channel selection algorithm for distributed spectrum access in a multichannel multiuser cognitive radio (CR) network employing rateless codes. Each secondary user (SU) uses rateless codes to increase the tolerance of interference either from other SUs or from the primary user (PU). However, due to the unpredictable arrival of PU and the inaccuracy of spectrum sensing,...
We design novel mechanisms and algorithms for fast, simple, and distributed interference management and scheduling in wireless femto networks via exchange of information over-the-air (OTA). We focus on Long Term Evolution (LTE) of the 3GPP standard and on the downlink; we leverage the existing signalling in LTE and delineate additional signals that are needed. Key aspects of our work include: (1)...
For non-contiguous OFDM (NC-OFDM) based cognitive radio (CR) systems, one of huge challenges is to establish spectrum synchronization before data transmissions. In this paper, we propose a novel active subchannel detection scheme for the NC-OFDM receiver without out-of-band spectrum synchronization information. The key idea of the proposed scheme is to employ the received training symbol to calculate...
We analyze the distance-weighted rate achievable in wireless networks that utilize multiple antennas and multi-user links. We give the transport capacity of vector multiple-access channels, and use this network topology at the physical layer of an ad-hoc network to obtain achievable distance-weighted rate regions for a multiple-antenna wireless network. These regions are obtained by considering interfering...
In this paper we are concerned with a scenario in which multiple messages (K) are concurrently flooding a dense wireless network. Rather than using standard packet switching we assume that the nodes relay cooperatively the messages, if they are able to decode them. Our objective is to propose and analyze a scheme that exploits the alignment of interference that opportunistically arises in the relay...
In this paper, we explore the degrees of freedom (DoF) of the broadcast channel (BC) where the transmitter is equipped with M antennas and there are K receivers, each equipped with N reconfigurable antennas capable of switching among M preset modes. Without any knowledge of the channel coefficient values but only receiver antenna switching modes at the transmitter, we propose an interference alignment...
We investigate achievable communication rates and some corresponding upper bounds of distributed reception in the presence of strong interferers. The scheme comprises one transmitter communicating to a remote destination via several relays, which forward messages to the remote destination through lossless links with finite capacities. The relays receive the transmission along with some strong unknown...
We consider a relay channel in the presence of interference which is non-causally available only at the source. The interference signal may have structure, for example it could come from another source communicating with its own destination. However, the external interferer is not willing to adjust its communication strategy to minimize the interference and is considered to be fixed. Two approaches...
We study quantized beamforming in wireless relay-interference networks with multiple transmitter-receiver pairs. For given transmitter rate requirements, we design structured distributed quantizers specifically to optimize the symbol error rate performance. We show that our quantizers achieve both maximal diversity and very high array gain using arbitrarily low feedback rates per receiver. Simulations...
The general two-user memoryless multiple-access channel, with common channel state information known to the encoders, has no single-letter solution which explicitly characterizes its capacity region. In this paper a binary “dirty” multiple-access channel (MAC) with “common interference”, when the interference sequence is known to both encoders, is considered. We determine its sum-capacity, which equals...
In this paper, we propose a novel algorithm to remove secondary users (SUs) in a Cognitive Radio (CR) CDMA network to maintain a predefined interference threshold at BS. Specifically, we develop a simulation test bed for analyzing performances of a CR user and a primary user (PU) in a single cell. CR users or SUs are assumed to form pair wise link in an infrastructure less ad hoc network that coexists...
The use of datalink communication in the VHF avionics band is increasing. This expansion increases the opportunity for interference between a datalink transmitter and a co-sited conventional AM type receiver for voice reception. The interference is audible by the pilot using the AM receiver and takes the form of periodic or aperiodic noise bursts or clicks heard over incoming voice traffic. Signal...
In this work, we examine the feasibility of achieving Subspace Interference Alignment (SIA) in a multibeam satellite interference uplink channel. The channel is assumed to be Line-Of-Sight where link is a single physical path with complex gain and a large fixed delay (e.g. GEO satellite). SIA achieves interference-free degree of freedom in cellular networks owing to the rich scattering present in...
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