نتایج جستجو برای: آشکارساز csi
تعداد نتایج: 6219 فیلتر نتایج به سال:
This paper proposes various power allocation algorithms for nonregenerative cooperative multi-input multi-output system, which have been optimised based on mutual information for different levels of channel state information (CSI) available at the base station (BS) and at the relay station (RS). Four different CSI settings have been studied in this paper : CSI of both the first and second hop c...
In this paper, we propose a novel adaptive modulation and coding (AMC) algorithm dedicated to reduce the feedback frequency of the channel state information (CSI). There have been already plenty of works on AMC so as to exploit the bandwidth more efficiently with the CSI feedback to the transmitter. However, in some occasions, frequent CSI feedback is not favorable in these systems. This work c...
This paper investigates power splitting for fullduplex relay networks with wireless information and energy transfer. By applying power splitting as a relay transceiver architecture, the full duplex information relaying can be powered by energy harvested from the source-emitted radio frequency signal. In order to minimize outage probability, power splitting ratios have been dynamically optimized...
We have found that chromosaponin I (CSI), a gamma-pyronyl-triterpenoid saponin isolated from pea (Pisum sativum L. cv Alaska), specifically interacts with AUX1 protein in regulating the gravitropic response of Arabidopsis roots. Application of 60 microM CSI disrupts the vertically oriented elongation of wild-type roots grown on agar plates but orients the elongation of agravitropic mutant aux1-...
یکی از مهمترین ابزار در طیف سنجی اشعه گاما، آشکارساز hpge می باشد. مفهوم آشکارساز نقطه ای مجازی برای آشکارساز ge(li) مطرح شد. براساس این مفهوم، نقطه ای درون آشکارساز ژرمانیومی وجود دارد که می تواند به عنوان آشکارساز نقطه ای مجازی همه واکنش ها را میزبانی کند. اگر واقعاً چنین نقطه ای وجود داشته باشد که بتواند همانند زمانی که کل حجم آشکارساز در نظر گرفته می شود، پاسخگو باشد، ملاحظات هندسی مورد است...
In multiple-input multiple-output–orthogonal frequency division multiplexing (MIMO–OFDM) communications, the channel state information (CSI) of the forward link at each subcarrier is needed for precoder design at the transmitter to achieve the maximal diversity and/or multiplexing gains. In frequency division duplex (FDD) systems, the CSI needs to be estimated at the receivers and fed back to t...
چکیده پژوهش حاضر با هدف عملی بودن ، اعتبار ، روایی و هنجار یابی پرسشنامه علائم مرضی کودکان (csi-4)در شهر کرج اجرا شده است. به همین منظور 300 نفر(132 دختر 168 پسر) کودکان خیابانی که در سال 89-1388 مشغول به تحصیل در مرکز نگهداری کودکان کار و خیابان واقع در شهر کرج بودند، به روش نمونه گیری در دسترس انتخاب و پرسشنامه علائم مرضی کودکان که شامل دو فرم والد و معلم می باشد و همچنین پرسشنامه افسردگی ما...
The recently proposed Cell-Free massive MIMO architecture is studied for the uplink. In contrast to previous works, joint detection is performed using global CSI. Therefore, we study strategies for transferring CSI to the CPU taking into account the fronthaul capacity which limits CSI quantization. Two strategies for pilot-based CSI acquisition are considered: estimate-andquantize and quantize-...
OBJECTIVE Pediatric somatization studies have used the 35-item Child Somatization Inventory (CSI-35) or psychometrically refined 24-item CSI (CSI-24). Exploratory factor analysis of the CSI-24 has identified a single factor that did not show good model fit in confirmatory factor analysis (CFA). Further evaluation of the CSI-24 factor structure is needed. METHODS The present study examined alt...
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