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Interference (wave propagation)

About: Interference (wave propagation) is a research topic. Over the lifetime, 26086 publications have been published within this topic receiving 321110 citations.


Papers
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Journal ArticleDOI
TL;DR: This paper presents exact closed-form expressions for the performance of multiple-input/multiple-output systems employing maximal ratio combining in the absence and presence of cochannel interference.
Abstract: This paper presents exact closed-form expressions for the performance of multiple-input/multiple-output systems employing maximal ratio combining in the absence and presence of cochannel interference. The results are applicable to systems operating over Rayleigh fading channels, and in which the minimum number of antenna elements at the transmitter and receiver is two. The mathematical formalism is illustrated by some numerical examples which study the effects of various parameters on the system performance.

138 citations

Journal ArticleDOI
TL;DR: In this article, a coherent detection system with autocorrelation sidelobe suppression using balanced detector and local light source is proposed, and the pseudocoherent detection is demonstrated experimentally by using a clock pulse.
Abstract: bOptical code division multiplexing (OCDM) using optical bipolar code and coherent detection is a new multiplexing method for future fiber-optic communication networks. Some optical bipolar codes, which are described by the combination of phase of optical chip pulses, with a repetition frequency 10 GHz are generated experimentally. Temporal matched filtering for the 10 Gb/s OCDM is demonstrated using optical encoder and decoder, and their fundamental properties are investigated. Effect of interference code is shown experimentally and discussed. The novel coherent detection system with autocorrelation sidelobe suppression using balanced detector and local light source is proposed. The pseudocoherent detection is demonstrated experimentally by using a clock pulse. Advantageous properties of the coherent detection are shown. The fundamental functions to realize the gigabit rate OCDM system is revealed.

138 citations

Proceedings ArticleDOI
01 May 2007
TL;DR: This research develops a model for the RF environment and determines probability distributions governing interference temperature as a function of various elements in the model, and proposes alternate usages for interference temperature and ways to boost capacity.
Abstract: The interference temperature model was proposed by the FCC in 2003 as a way to dynamically manage and allocate spectrum resources. It would allow unlicensed radios to sense their current RF environment and transmit in licensed bands, provided their transmission does not raise the interference temperature for that frequency band over the interference temperature limit. It never received much interest because nobody was sure exactly how to use it or how if it would work. This research focuses on a mathematical analysis of the interference temperature model in an effort to examine the relationships between the capacity achieved by the unlicensed network and the interference caused to the licensed network. We develop a model for the RF environment and determine probability distributions governing interference temperature as a function of various elements in the model. We then determine bounds on the amount of interference caused by implementing such a system. We examine model environments for a wireless WAN and a wireless LAN, each coexisting with a licensed carrier. For each, we quantify both the impact on the licensed signal and also the capacity achieved by our underlay network. By substituting numeric values for RF environments in which the interference temperature model might be applied, we show that achievable capacity is very small, while the impact the licensee can be very large. Based on this, we propose alternate usages for interference temperature and ways to boost capacity.

138 citations

Journal ArticleDOI
TL;DR: In this paper, an analytical co-channel interference model was proposed for multi-cell multiple-input multi-output (MIMO) cellular networks, and the impact of different channel parameters on the new interference model is analyzed numerically.
Abstract: Characterization and modeling of co-channel interference is critical for the design and performance evaluation of realistic multi-cell cellular networks. In this paper, based on alpha stable processes, an analytical co-channel interference model is proposed for multi-cell multiple-input multi-output (MIMO) cellular networks. The impact of different channel parameters on the new interference model is analyzed numerically. Furthermore, the exact normalized downlink average capacity is derived for a multi-cell MIMO cellular network with co-channel interference. Moreover, the closed-form normalized downlink average capacity is derived for cell-edge users in the multi-cell multiple-input single-output (MISO) cooperative cellular network with co-channel interference. From the new co-channel interference model and capacity, the impact of cooperative antennas and base stations on cell-edge user performance in the multi-cell multi-antenna cellular network is investigated by numerical methods. Numerical results show that cooperative transmission can improve the capacity performance of multi-cell multi-antenna cooperative cellular networks, especially in a scenario with a high density of interfering base stations. The capacity performance gain is degraded with the increased number of cooperative antennas or base stations.

137 citations

Proceedings ArticleDOI
27 Jun 2004
TL;DR: In this paper, an information theoretic framework for the study of efficient known interference cancellation technique is presented, where the dirty paper channel model is given where the arbitrary interference is known at the transmitter is a statistically independent Gaussian random variable with variance.
Abstract: An information theoretic framework for the study of efficient known interference cancellation technique is presented in this paper. The dirty paper channel model is given where the arbitrary interference is known at the transmitter is a statistically independent Gaussian random variable with variance. The link to precoding was made and it was shown that the full capacity might be achieved using lattices and MMSE scaling for arbitrary interference. A BCJR detector computes the a posteriori probability (APP) values of the channel code bits, summing over the corresponding coset. Extrinsic information is iteratively passed between BCJR detector and channel decoder. Code design is done using the EXIT chart, achieving an improvement over optimal scalar quantization (SQ).

137 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202213
2021840
20201,221
20191,432
20181,351
20171,311