Crosspolarization discrimination of mimo antenna configuration at a mobile station in indoor propagation environment. Polarization characteristics of multipleinput multiple. Xpiccross polarization interference cancellation,cross polarization discrimination xpd calculations. The modulation is 64apsk of dvbs2x with symbol rate of 300msps. We also investigated the influence of antenna directivity indoors. Measurements of microwave fading and depolarization were carried out near ottawa, canada at 11 ghz and 17 ghz on two adjacent 16 km paths. Enhancing crosspolarization discrimination or axial ratio beamwidth of diagonally dual or circularly polarized base station antennas by using vertical parasitic elements. In a conventional cross polarization interference canceller, a time difference between the main polarization and the interference wave component is not taken into consideration. Cross polarization sometimes written xpol, in antenna slang is the polarization orthogonal to the polarization being discussed. Cross polarization discrimination of mimo antenna configuration at a mobile station in indoor propagation environment. Bashir department of electrical and computer engineering, faculty of en gineering, international islamic university malaysia, malaysia email. Pdf modeling and practical implementation of a broadband. Xpd, cross polarization discrimination, in wave transmission. Most of the radar systems use rcs as a means of discrimination.
Shattuck department of chemistry, university of california at berkeley, berkeley, california 94720. Polarization antenna polarization cross polarization. Characterization of cross polarization discrimination in. The ratio of the signals desired on the desired polarization to the signals undesired signals on the opposite polarization. The definition of cross polarization ludwig, arthur published in. Figure 3 shows the simulation results of the dual antenna shown in fig. Indoor polarization and directivity measurements at 5. Therefore the reception side employs a cross polarization interference canceller to prevent such cross polarization interference. For instance, if the fields from an antenna are meant to be horizontally polarized, the crosspolarization in this case is vertical polarization. Crosspolarization in solid state nmr, crosspolarization cp, i. Xpiccross polarization interference cancellation,cross.
To prevent this blurring of discrimination, a cross polarization interference cancelling technique is used at the receiver side. For frequency ranges which span more than one octave, specifically designed antennas are used to obtain reliable results by having a high level of cross polarization discrimination xpd. Aeu international journal of electronics and communications. This definition appears frequently and is found in the following acronym finder categories. The incomplete crosspolarization discrimination xpd of the antennas at tx and rx, and the depolarization that electromagnetic waves undergo when they propagate through the environment. In this chapter, we will discuss how crosspolarization works. Xpd cross polarization discrimination acronymfinder. Progress in electromagnetics research, pier 55, 175188, 2005 the performance of polarization diversity schemes in outdoor micro cells t.
Pdf enhancing crosspolarization discrimination or axial. Crosspolarization isolation from very small aperture. We have tested an engineering model of the transmitter, and the onboard antenna with high crosspolarization discrimination xpd. Us5383224a cross polarization interference canceller. H and a discrimination using linear polarization of. Abstractin this paper, we investigate the polarization characteristics of the multipleinput multipleoutput mimo channels. A raytracing computer model, combining the effects of the curvature of the earth, of the radiation patterns of the antennas, as well as those of the reflection at the earths surface, has been developed in order to simulate multipath effects on the relationship between crosspolarization discrimination xpdand copolar attenuation cpavalues occurring in frequencyreuse lineofsight. I e e e transactions on antennas and propagation publication date. Features stable performance over wide bandwidths with flat gain superior port isolation, cross polarization discrimination, gain, vswr, and fronttoback 4x4 applications.
In an indoor environment, we confirm that the crosspolarization discrimination xpd in the direction of angleofdeparture can be represented as the spatial correlation of the mimo channel. Measurements of crosspolarization discrimination at 11. Carbon proton nmr crosspolarization times in solid adamantane a. The cross polarization discrimination xpd, which is defined as the. The alternative definitions are discussed with respect to several applications, and the definition which corresponds to one standard measurement practice is proposed as the best choice. The cross polarization discrimination xpd is found to change over time, while its variation in frequency domain is relatively small. The conditional distributions of clearair crosspolarized signal level are. Xpic, or crosspolarization interference cancelling technology, is an algorithm to suppress. The measuring and identifying the scattering centres for a. But i do not know how to calculate the cross polarization discrimination. The polarization of an electromagnetic wave is defined as the orientation of its electric. On antenna polarization discrimination, validating.
Cross polarization cp this approach is valid as long. Explain the difference between crosspolarization discrimination andpolarization isolation. Simulations are carried out by changing the gp, as shown in fig. Carbon proton nmr crosspolarization times in solid. Also if there are some references please let me know. A cross polarization interference canceller cancels interference polarization by providing a phase difference detecting circuit for detecting a phase difference between a main polarization and an interference polarization component of the main polarization, and a phase shifter for shifting a data discrimination clock signal of the interference polarization wave component. Figure 3a shows the induced current flows when the gp is located at the current flow near the subantenna is in the vertical direction. Relationship between crosspolarization discrimination.
Us4914676a cross polarization interference canceller. The clearair fading data at 11 ghz agree approximately with ccir predicted values, but the 17 ghz data are more than an order of magnitude less severe than the predictions. Cross polarization interference canceller fujitsu limited. Crosspolarization isolation from very small aperture terminals vsats question itur 2314.
Cross polarization discrimination how is cross polarization discrimination abbreviated. Explain what is meant by crosspolarization discrimination and brieflydescribe the factors which militate against good crosspolarization discrimination. Xpd systems ab, an independent security consultancy and research firm. Prediction of cross polarization discrimination at millimeter wave band due to dust storms abdulwaheed musa and s. Nevertheless, after three years of photon linear collider running heavy scalar and pseudoscalar higgs bosons in mssm can be distinguished at a 4. The definition of cross polarization ieee journals. Xpic, or crosspolarization interference cancelling technology, is an algorithm to suppress mutual interference between two received streams in a polarizationdivision multiplexing communication system the crosspolarization interference canceller known as xpic is a signal processing technique implemented on the demodulated received signals at the baseband level.
Annex 1 estimation of polarization discrimination 1 definition of the polarization of a wave polarization is defined as a vector of the electric field wave which is located in a plane orthogonal to the direction of the. Receiving antennas designed as means for high cross polarization discrimination. Dual polarization channels are applied to the system. Polarization crosstaik in pm fiber classification of polarization crosstalk by cause polarization crosstalk in a pm fiber arises from three principal causes. Dual circularly polarization x band 2gbps downlink. I am simulating antenna radiation patterns using feko. Crosspolarization discrimination is the measure of discrimination to oppositely polarized electromagnetic waves e. Polarized antenna an overview sciencedirect topics. In this letter, we present a correlated channel model for a dualpolarization antenna to omnidirectional antennas in indoor smallcell multipleinput multipleoutput mimo systems. Pdf on antenna polarization discrimination, validating. Satellite comunications pages 101 150 text version. Citeseerx document details isaac councill, lee giles, pradeep teregowda. There are at least three different definitions of cross polarization used in the literature.
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