نتایج جستجو برای: wlan و cdma
تعداد نتایج: 771599 فیلتر نتایج به سال:
یکی از مسائل اساسی مخابرات سیار مساله طیف گسترده می باشد که برای افزایش تعداد کاربران تحت پوشش ، کاربران را مجاز به استفاده از یک پهنای باند فرکانسی مشترک بصورت همزمان می نماید. یکی از روشهای طیف گسترده که بصورت وسیع مورد استفاده قرار می گیرد روش ds-cdma می باشد برای آشکارسازی سیگنال دریافتی در سیستم ds-cdma آشکارسازهای چندکاربره متعددی پیشنهاد شده است که در این میان آشکارساز mlse یک آشکارساز چ...
Q: What is a Wireless LAN (WLAN)? Q: What are the benefits of using a WLAN instead of a wired network connection? Q: Are Intel WLAN products interoperable with other product brands? Q: What is Wi-Fi*? Q: What is IEEE 802.11b, 802.11g, and 802.11a? Q: What is the transmission range of WLAN products? Q: What data rates are available with a WLAN network connection? Q: What is an Access Point? Q: W...
The WLAN are coming more and more significant factor in telecommunications business. The success of WLAN hotspot networks is increasing and the new GAN/UMA solution is being launched. It is very crucial time in WLAN business and especially for mobile operators. The question is, how they are going to gain from WLAN in most competent way. In this paper is first analyzed some WLAN solutions in the...
This paper carries out a numerical simulation investigating three different modulation formats: carrier suppressed return to zero (CSRZ), modified duobinary (MDRZ) and (RZ). The purpose of this investigation is find the optimum format for hybrid optical code division multiple accesses–dense wavelength multiplexing (optical CDMA/DWDM) system with implementation an electro-optic phase modulator (...
Face recognition is important in human identification. The biological recognition technique acts as a good method and broad applications in security areas. This work presents a method to improve the face recognition accuracy using a combination of Principal Component Analysis (PCA), and Wavelet Transform. Wavelet Transform is used to decompose the input image with different levels and rearrange...
Recently, exponential rise in the demand of wireless communication has led to gross reduction availability frequency spectrum meet proliferation demands. Overlay and underlay cognitive radio used address this problem is characterized with poor management assigned spectrum. The basic essential mechanism Radio (CR) find unused called Spectrum Sensing. This important optimizing allocation for incr...
Q: What is a Wireless LAN (WLAN)? Q: What are the benefits of using a WLAN instead of a wired network connection? Q: Are Intel WLAN products interoperable with other product brands? Q: What is Wi-Fi*? Q: What is IEEE 802.11b, 802.11g, and 802.11a? Q: What is the transmission range of WLAN products? Q: What data rates are available with a WLAN network connection? Q: What is an Access Point? Q: W...
سیستم های بی سیم سلولی cdma همواره دچار تداخل های چند مسیرگی و چند کاربری هستند زیرا کدهای مورد استفاده در این سیستم ها دارای خواص تعامد عالی و مطلوب نبوده و سیگنال های دریافتی در اثر عبور از مسیرهای مختلف و عدم سنکرون بودن کاربران، تعامد خود را از دست می دهند. در سال های اخیر کشف کدهای هوشمند دارای پنجره عاری از تداخل (ifw) زمینه را برای ایجاد سیستم داپلکس جدیدی با نام تکنیک تقسیم کد فراهم آور...
صخلملا Infertility affects 15% of couples seeking children worldwide and male factor is evident in about 30-50% of the cases. To assess the effect of sperm chromatin integrity on the outcomes of intracytoplasmic injection, sperm DNA compactness was evaluated by acridine orange staining in 40 fertile and 44 infertile men attending one infertility clinic. The results showed no significant differe...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید