نتایج جستجو برای: شبکه مش wimax
تعداد نتایج: 39296 فیلتر نتایج به سال:
یکی از مهم ترین مشکلاتی که شبکه های ad-hoc بی سیم با آن مواجه هستند، بازده پایین شبکه است. تحقیقات زیادی در زمینه بالا بردن بازده این گونه شبکه ها انجام شده که از جمله آن ها می توان طراحی تکنیک های مسیریابی بهتر و ایجاد تغییراتی در مدیریت دستیابی به کانال بی سیم را نام برد. از طرف دیگر در سال های اخیر، کدینگ شبکه به عنوان تکنیکی که تضمین کننده افزایش بازده در شبکه های بیسیم مش است، محبوبیت زیاد...
In the new era of communication, WiMAX (IEEE 802.16) is the most emerging technology that enables ubiquitous delivery of broadband wireless access for fixed and mobile users. It is a more innovative and commercially viable alternative to cable modems and DSL technologies as it is cost effective, easy to implement, high performance and high resource utilization technology. This economic environm...
In this paper, a novel network planning process of the Mobile WiMAX for Railway (WiMAX-R) network is proposed. We first analyze the factors need considered in network planning. After introducing the WiMAX-R network architecture, the WiMAX-R network planning process is presented in detail. The process comprises application analysis, capacity prediction, network parameters configuring, coverage p...
اخیراً شبکه های مش بی سیم به یک تکنولوژی نویدبخش تبدیل شده اند که کاربردهای مفیدی را ممکن می سازند. در گذسشته این شبکه ها گره هایی را به کار می بردند که تنها از یک کانال فرکانسی استفاده می کردند. شبکه های مش بی سیم تک کاناله با محدودیت هایی از قبیل کارایی پایین مواجه بودند. برای حل این مشکل یکی از راه ها استفاده از کانال های متعدد در شبکه است. بنابراین نحوه تخصیص این کانال ها به گره ها یکی از مو...
1 From the standard and regulations to front-end specifications 1.1 Regulations characteristics The WiMAX standard includes two sub-standards. The first standard is the 802.16a or Fixed WiMAX and the second standard is the 802.16e or Mobile WiMAX. We focus here only on the Mobile WiMAX. The basic radio channel features are summarized in the Table 1.
In this paper, we discuss security problems, with a focus on collaborative attacks, in the Worldwide Interoperability for Microwave Access (WiMAX) scenario. The WiMAX protocol suite, which includes but is not limited to DOCSIS, DES, and AES, consists of a large number of protocols. We present briefly the WiMAX standard and its vulnerabilities. We pinpoint the problems with individual protocols ...
The necessary design steps for the implementation and deployment of WiMAX in a particular region have been discussed. At first, deployment technique and issues of WiMAX campus network are described. A model is proposed for fixed WiMAX connectivity using the WiMAX gateway as a backbone and modem for access purposes. The model is done under some real world application for the campus of University...
WiMAX is one of the emerging wireless broadband transmission standards. Its signal coverage, upload and download rate, and bandwidth efficiency is better than traditional wireless networks. It can be the last mile for where the cable and DSL networks cannot be reached. Because of its characteristic of broadband access, the possible applications are of a wide range, such as web browsing and VOIP...
The development of integrating several wireless network technology make wireless network devices built everywhere. In 1999, IEEE proposes WiMAX broadband wireless technology which has high transmission bandwidth and wide coverage. There are more and more researches as abovementioned wireless technology to increase Mesh network technology which can easily increase network coverage. Intel[1] poin...
The World Wide interoperability for microwave access (WiMAX) technology support to the flexible channel sizes and different countries use different channel it depends on the rule and regulation of countries and their environment. The WiMAX network asymmetry is largely depends on DL:UL ratio. This paper investigates the effect of channel bandwidth in WiMAX network with network asymmetry using TC...
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