Results from a 37 ks BeppoSAX Low-Energy Concentrator Spectrometer (LECS) observation of the supersoft source SMC 13 (=1E 0035.4-7230) in the Small Magellanic Cloud are reported. This source has probably the softest spectrum observed so far with BeppoSAX, with no detected counts ∼ >0.5 keV. The BeppoSAX spectrum is fitted either with a blackbody spectrum with an effective temperature kT = 26–58...

Recently, the mobile communication industry is moving rapidly toward Long Term Evolution, or LTE, systems. The leading carriers and vendors are committed to launching LTE service in the near future; in fact, a number of major operators such as Verizon have initiated LTE service already. LTE aims to provide improved service quality over 3G systems in terms of throughput, spectral efficiency, lat...

In this paper we consider the problem of adaptive video streaming over an LTE-A network that utilizes Licensed Assisted Access (LAA) which is an instance of LTE Unlicensed. With LTE Unlicensed users of the LTE-A network opportunistically access radio resources from unlicensed and licensed carriers through Carrier Aggregation (CA). Our objective is to select the highest possible video quality fo...

Due to the fast increase of mobile traffic, most mobile network operators face the congestion issue in licensed spectrum bands. Several telecommunication vendors and operators propose to expand LTE service to the unlicensed spectrum bands to relieve the traffic congestion. However, LTE in unlicensed spectrum may interfere with Wi-Fi communications in the same bands and cause significant decreas...

LTE and LTE-Advance communication are based on the uplink reference signals to estimate the channel characteristics. A split transmission of sounding and demodulation signaling will cause many constraints; such as layers and reference signal symbols interferences, increase in delay and reduction in the overall throughput of the LTE uplink transmission. In this paper, we propose an energy effici...

License Assisted Access (LAA) LTE (LTE-LAA) is a new type of LTE that aggregates the licensed LTE bands with the unlicensed bands via carrier aggregation. To operate in unlicensed bands, LTE-LAA adopts the listen-before-talk policy and designs its channel access mechanism similar to WLAN’s DCF. In this paper, we consider an LAA network consisting of an LTE-LAA eNB coexisting with a Wi-Fi STA, a...

Executive Summary Spectrum, the single most important resource for telecommunication voice and mobile broadband service, is finite and limited. As subscribers demand faster and increased capacity anytime, anywhere, operators face the challenge of maximizing all available spectrum assets – FDD or TDD. In previous 3GPP standards, mobile operators have deployed Frequency Division Duplex (FDD) tech...

An LTE User Equipment (UE) can only be scheduled for uplink transmission if its uplink transmission timing is synchronized. The LTE Random Access Channel (RACH), therefore, plays a key role as an interface between nonsynchronized UEs and the orthogonal transmission scheme of the LTE uplink radio access.

In this paper, we study a class of kinetic equations describing radiative transfer in gases which include also the interaction molecules gas with themselves. We discuss several scaling limits and introduce some Euler-like systems coupled radiation as an aftermath specific limits. consider local thermodynamic equilibrium (LTE) holds, well situations assumption fails (non-LTE). The structure gas-...

در آشکار‌ساز CMS نسبت‌های انشعاب بوزون هیگز مدل استاندارد به جفت‌‌های J/ψ(1S) و cc ترتیب برابر 2-10×1/8 2-10×2/89 اندازه‌گیری شده است. لحاظ نظری یکی از سناریوهای ممکن برای تولید مستقیم این است که آغاز جفت واپاشی نماید سپس مرحله‌ی بعد هر یک کوارک‌های c طور مزون ترکش کنند. بر اساس سناریو مقاله بطریق کوارک‎های با استفاده نظریه اختلال مکانیک کوانتومی رنگ (pQCD) نظر گرفتن حالت‌های قطبش طولی عرضی محا...