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We consider a coordinated multicell multiple-antenna downlink transmission in a cellular network also known as \textit{network MIMO}, which is expected to play a key role in future broadband cellular systems. While clustered network MIMO is a practical scheme to benefit from multicell cooperation, it still suffers from inter-cluster (uncoordinated) interference especially for the cell-edge users....
In this paper, we investigate an interference alignment (IA) technique introduced by Cadambe and Jafar in mutually interfering broadcast channels (IFBCs). First, we study the spatial multiplexing gain (SMG) for the 3-cell IFBC where all base stations and mobile users are equipped with multiple antennas. To achieve the derived optimal SMG, we extend the IA algorithm designed for K-user multi-input...
In this paper a composite analytical model of DS-CDMA wireless communication system considering multipath Nakagami fading along with Doppler frequency shift, tracking jitter, local oscillator frequency offset and multi-access interference (MAI) for different PN sequences is presented. The analysis presents the development of a novel approach to find the pdf (probability density function) of the signal...
Traditionally, control loops are closed using periodic sensing and actuation. When communication resources are scarce, much may be gained by instead transmitting only when something important has happened in the loop. However, there are no known closed form solutions to this kind of control problem. This paper presents a simple model of the interference between event-based control loops caused by...
In this paper, studies are performed and techniques are proposed for interference mitigation in Transmitted Reference ultra wideband (TR-UWB) system. The best method for suppressing and reducing the mutual interference is without modifying interfering systems. The coexistence of multisystem is given by: (a) Interference reduction from UWB systems to other narrowband (single and multiple) and wideband...
This paper proposes a cooperative spectrum sensing scheme for cognitive radio networks using a polynomial classifier. The proposed scheme utilizes either coherent or cyclostationary features in the received signal at each node and the extracted features are used by a central node to make to a global decision about the availability of spectrum holes for use by the cognitive radio network. The paper...
This paper investigates the throughput performance of carrier sense multiple access (CSMA) in Rice fading channels. The approach considered includes the signal capture model with coherent and incoherent addition of interfering signals. The case of uniform attenuation for all terminals (or perfect power control) is studied. Analytical and numerical results are presented.
We propose a new cross-layer approach to mitigate interference in multihop networks. Precisely, we cancel all adjacent node interference in a multihop path by MIMO two-way relay scheme and jointly optimize the routing and power allocation to mitigate the interference from far nodes. We model and efficiently solve this optimization problem using a geometric programming framework. Our simulation results...
In this paper an algorithm suitable to interference detection for terminal embedding commercial GNSS chipsets is presented. The algorithm monitors the value of the C/N0 estimated by the receiver for multiple channels and a detection rule is set in order to obtain the desired performance in terms of false alarm and detection probabilities.
This paper focuses the attention on the problem of Radio Frequency Interference (RFI) mitigation in the framework of GNSS. The paper concentrates on interference mitigation algorithms to be applied within the digital part of a GNSS receiver. The first part of the paper focuses on the mitigation of RFI based on Wavelets. The theoretical fundamentals of the approach are presented, introducing the continuous...
There have already been a number of well documented cases where the GNSS signals have been interfered by different sources. A number of different methods has been developed to counteract this. One problem with doing experiments to validate the accuracy of interference detection system is that the GPS L1 band is protected, therefore it is difficult to get permission to deliberately broadcast on those...
In this paper we introduce a new architecture for dynamic spectrum sharing called the distributed dynamic spectrum leasing (D-DSL) and a game theoretic framework for its implementation on a cognitive radio network. In D-DSL, it is assumed that each channel is assigned to a primary user who may lease the channel to secondary users. The spectrum owners can thus dynamically adjust the amount of interference...
Recently, network architectures based on high-density cells with reduced transmit power have been claimed as a promising solution for energy efficiency enhancement. Cell size reduction down to the range 10-50 m is the paradigm of femtocells, based on low-cost, user-deployed in-house base stations connected to the operator's core network through DSL links. However, in dense urban scenarios, radio interference...
Under the background of TDD mode and LTE-Advanced scene, in this paper, we combine physical network coding with relay technology in order to make physical network coding-decode and forward (PNC-DF) together with physical network coding-amplify and forward (PNC-AF) transfer mode can be used to improve network throughput by using interference. Because of the ability to listen to the multi-user relay...
We consider the asymptotic performance of a class of linear receivers in multiple-input multiple-output (MIMO) multiple access channels (MAC). Under the assumption that the number of transmitters K and the number of receive antennas N grow large at the same rate and that the receiver has only an imperfect estimate of the channel matrix, we derive deterministic equivalents for the signal-to-interference-plus-noise-ratio...
We have developed a low interference multimodal sensor for pH (power of Hydrogen) and optical imaging. The signal interference between pH and optical outputs is shown to be caused during pH sensing by the photogenerated electrons. We suppressed this interference by adding another charge accumulation region to the conventional multimodal sensor structure for measuring only the amount of photogenerated...
In this paper, we first introduce a simple two-cell multiple-input multiple-output (MIMO) solution where each base station has only its own data message. The algorithm is based on limited feedback from the mobile station (MS). We assume there is no base station (BS) cooperation through backbone; therefore cooperation among BSs is not a requirement. This renders the concept of the proposed solution...
In this paper, the optimal spectral efficiency (data rate divided by the message bandwidth) that minimizes the probability of causing disruptive interference for ad hoc wireless networks or cognitive radios is investigated. Two basic problem constraints are considered: a given message size, or fixed data rate. Implicitly, the trade being optimized is between longer transmit duration and wider bandwidth...
Practical full-duplex MIMO relays require efficient mitigation of the relay self-interference signal propagating from the transmit antenna array to the receive antenna array; this paper concentrates on time-domain cancellation (TDC) and spatialdomain suppression by null-space projection (NSP). Both schemes can eliminate all self-interference in the idealistic case where the relay has perfect side...
Interference reduces the performance of a correct data signal detection and decoding. This problem becomes severe when interferences exist during the period of channel estimation. This will destroy the accuracy of channel estimation and, will eventually result severe degradation in the performance of signal detection and decoding in the entire data packet/frame. In this article, we propose an improved...
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