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asynchronous base transceiver station BTS operation and

CẤU TRÚC MẠNG 3G VÀ VAI TRÒ CỦA IMS TRONG CÁC MẠNG 3G

CẤU TRÚC MẠNG 3G VÀ VAI TRÒ CỦA IMS TRONG CÁC MẠNG 3G

1.2.4.1. 3GR1 : Kiến trúc mạng UMTS chồng lấn Phát hành 3GP1 dựa trên phát hành của 3GPP vào tháng 3 và các đặc tả kỹ thuật vào tháng 6 năm 2000. Phát hành đầu của 3GR1 chỉ hỗ trợ UTRA-FDD và sẽ được triển khai chồng lấn lên GSM. Chiến lược dịch chuyển từ GSM sang UMTS phát hành 3GR1 được chia thành ba giai đoạn được ký hiệu là R1.1, R1.2 và R1.3 (R: Release: phát hành). Trong các phát hành này các phần cứng và các tính năng mới được đưa ra. Các nút B được gọi là MBS (Multistandard Base Station: trạm gốc đa tiêu chuẩn). Tuy nhiên MBS V1 chỉ đơn thuần là nút B, chỉ MBS V2 mới thực sự đa tiêu chuẩn và chứa các chức năng của cả nút B và BTS trong cùng một hộp máy. Tương tự RNC V2 và OMC-R V2 được đưa ra để phục vụ cho cả UMTS và GSM.
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NGHIÊN CỨU HỆ THỐNG THU PHÁT TRẢI PHỔ TRONG CDMA

NGHIÊN CỨU HỆ THỐNG THU PHÁT TRẢI PHỔ TRONG CDMA

65 TRANG 5 5 BẢNG VIẾT TẮT AMPS Advanced Mobile Phone System Hệ thống điện thoại tiên tiến BTS Base Transceiver Station Trạm thu phát gốc BSS Base Station Subsystem Phân hệ trạm gốc BSC [r]
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XÂY DỰNG HỆ THỐNG QUẢN LÝ LỘ TRÌNH XE BUÝT

XÂY DỰNG HỆ THỐNG QUẢN LÝ LỘ TRÌNH XE BUÝT

79 TRANG 7 i DANH M C CÁC T VI T T T AOA: Angle of Arrival A-GPS Assisted GPS BTS: Base Transceiver Station C/A code : coarse acquisition code Cell-ID Cell site Identification DGPS: Code[r]
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Báo cáo hóa học:

Báo cáo hóa học: " Research Article Downlink Resource Allocation for Autonomous Infrastructure-based Multihop Cellular Networks" pdf

four dependent constraints into six independent constraints, it is possible to map the above problem to a multidimen- sional multichoice knapsack problem (MMKP) ( Section 4 ). Although MMKP is NP-hard, there are polynomial-time heuristic algorithms to solve it [ 18 , 19 ]. In our proposed adaptive scheme, each BS and relay reserves some portion of its total transmit power for forwarding the tra ffi c of other relays or BSs. Referring to Figure 2 , we assume that BS 1 reserves k 1 P BS for serving the packets that should be forwarded via relay 1. Relay 1 also reserves k 12 P RLY for forwarding the packets that should be transmitted via relay 2. These packets are transmitted by two hops. The same thing applies to relay 2 and BS 2. We represent the reserved power of relay 2 and BS 2 by k 21 P RLY and k 2 P BS , respectively. The values of k 1 , k 2 , k 12 , k 21 , all less than 1, are adjusted every time slot based on the tra ffi c profile of the BSs and relays so as to make the tra ffi c load as much balanced as possible. In this paper, we refer to them simply as “ k parameters.” In brief, the proposed adaptive scheme makes the constraints independent resulting in a balanced tra ffi c load by adjusting the values of k parameters. The details will be described in
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CODE DIVISION MULTIPLE ACCESS (CDMA) PHẦN 6 DOCX

CODE DIVISION MULTIPLE ACCESS (CDMA) PHẦN 6 DOCX

3.3.2 Second-Order Analysis The previous discussion of the capacity of CDMA systems is slightly misleading. The analysis provides the average capacity assuming that all interference variables assume their average values. However, as we have discussed previously, due to log-normal shadowing, voice activity, and the random location of mobiles in their respective cells, the interference is a random variable. What we would like to calculate is the probability of outage, i.e., the probability that the SINR falls below a required value. Note that this approach, while intuitive for the uplink, is not particularly useful for the downlink. On the uplink, capacity depends on the interference observed, but on the downlink, capacity depends on the power expended per user. Thus, we will take a slightly different (though closely related) approach for the downlink. Both analyses closely follow the
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BÁO CÁO HÓA HỌC:

BÁO CÁO HÓA HỌC:" RESEARCH ARTICLE ROBUST THP TRANSCEIVER DESIGNS FOR MULTIUSER MIMO DOWNLINK WITH IMPERFECT CSIT" DOC

N t = 8, we find that the di ff erence between the nonrobust design and the proposed robust design decreases when more transmit antennas are provided. A similar e ff ect is observed for increase in number of receive antennas for fixed number of transmit antennas. It is also found that the di ff erence between the performance of these algorithms increases as the SNR increases. This is observable in (17), where the second term shows the e ff ect of the CSIT error variance amplified by the transmit power. In Figure 3, we illustrate the SMSE performance as a function of di ff erent channel estimation error variances, σ 2
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CHAPTER 2  IT PROJECT MANAGER

CHAPTER 2 IT PROJECT MANAGER

MOV: The B2C project will provide a 20% return on investment and 500 new customers within the first year of its operation TRANG 18  Step 3: Identify Alternatives ◦ Base Case Alternative[r]
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EVOLUTION OF WIRELESS MOBILE COMMUNICATIONS  I 2011  4 25HYUNGHYUNG JIN CHOI SUNGKYUNKWAN DOC

EVOLUTION OF WIRELESS MOBILE COMMUNICATIONS I 2011 4 25HYUNGHYUNG JIN CHOI SUNGKYUNKWAN DOC

The Signaling Frame Structure is a multi-frame of 51 frames to accommodate control channels (FCCH, SCH, BCCH, CCCH) in the downlink and random access (RACH) in the uplink. This frame structure uses Traffic Channel Frame Structure26 frames to build a multi frame. Frames 0 to 11 and 13 to 24 carry speech or user data. Frame 12 is used as SACCH, Frame 25 is idle, allowing the base station to measure field strengths from mobiles in other cells, when needed for handovers.
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TÀI LIỆU ARM ARCHITECTURE REFERENCE MANUAL- P5 PPTX

TÀI LIỆU ARM ARCHITECTURE REFERENCE MANUAL- P5 PPTX

Is described in Addressing Mode 2 - Load and Store Word or Unsigned Byte on page A5-18. It determines the I, U, Rn and addr_mode bits of the instruction. Only post-indexed forms of Addressing Mode 2 are available for this instruction. These forms have P == 0 and W == 0, where P and W are bit[24] and bit[21] respectively. This instruction uses P == 0 and W == 1 instead, but the addressing mode is the same in all other respects.
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BÁO CÁO HÓA HỌC    OPPORTUNISTIC NONORTHOGONAL PACKET SCHEDULING IN FIXED BROADBAND WIRELESS ACCESS NETWORKS  POTX

BÁO CÁO HÓA HỌC OPPORTUNISTIC NONORTHOGONAL PACKET SCHEDULING IN FIXED BROADBAND WIRELESS ACCESS NETWORKS POTX

Frame length (ms) 5.0 Average data rate per user (kbps) 404.16 Simulation tool used OPNET Modeler 9.1 [ 19 ] solution would result in some degradation in performance in terms of overall network interference; however, this solution would still control in-group interference for a subset BSs in the group. Secondly, even when a BS is a member of di ff erent interferer groups and receives di ff erent commands, a second tier of the control scheme (e.g., the majority rule algorithm) can be employed to resolve the conflicts. For instance, when a BS is a member of three groups, it can only transmit when the decisions from two or more groups go in favor of trans- missions.
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CÔNG NGHỆ TRUYỀN DẪN TÍN HIỆU VÔ TUYẾN  QUA SỢI QUANG  ROF  VÀ  KHẢ NĂNG ỨNG DỤNG TRONG MẠNG VIỄN THÔNG TỈNH VĨNH PHÚC

CÔNG NGHỆ TRUYỀN DẪN TÍN HIỆU VÔ TUYẾN QUA SỢI QUANG ROF VÀ KHẢ NĂNG ỨNG DỤNG TRONG MẠNG VIỄN THÔNG TỈNH VĨNH PHÚC

...65 TRANG 3 CÁC KÝ HIỆU VÀ THUẬT NGỮ VIẾT TẮT ADC Analog-to-digital converter Bộ chuyển đổi tương tự số AP Access Point Điểm truy nhập BS Base Station Trạm cơ sở CBS Central Base Stati[r]
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Phương án kỹ thuật khảo sát xây dựng được quy định tại điều 13

Phương án kỹ thuật khảo sát xây dựng được quy định tại điều 13

ky thuat6X1118A (3430HD) Installation and Operation Manual6X1118A (3430HD) Installation and Operation Manualky thuat6X1118A (3430HD) Installation and Operation Manual6X1118A (3430HD) Installation and Operation Manualky thuat6X1118A (3430HD) Installation and Operation Manual6X1118A (3430HD) Installation and Operation Manualky thuat6X1118A (3430HD) Installation and Operation Manual6X1118A (3430HD) Installation and Operation Manualky thuat6X1118A (3430HD) Installation and Operation Manual6X1118A (3430HD) Installation and Operation Manualky thuat6X1118A (3430HD) Installation and Operation Manual6X1118A (3430HD) Installation and Operation Manualky thuat6X1118A (3430HD) Installation and Operation Manual6X1118A (3430HD) Installation and Operation Manual
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ENVIRONMENTAL MONITORING PART 15 PPTX

ENVIRONMENTAL MONITORING PART 15 PPTX

In order to investigate how power is consumed by a sensor, a simulation study has been established. The results are validated by the CC1000 transceiver data sheet. As the sensor operating system used in this work is TinyOS, the selected simulator is TOSSIM which is a TinyOS library. TinyOS is an operating system specifically designed for embedded devices such as sensors. It has been widely used in both research and commercial communities. The selected release of the simulator is TOSSIM 1 and it does not provide power usage measurement capability. PowerTOSSIM, an extension module developed for analysing power consumption of hardware components (Shnayder et al., 2004) is used to address the investigation on power consumption and it is included in Tiny 1.1.11. The only sensor platform supported in PowerTOSSIM is Mica2 which employed the CC1000 radio chip. The PowerTOSSIM supports an operating frequency of 400 Megahertz (MHz) and a voltage of 3 Volt. The energy model file of PowerTOSSIM adopts the required transmission current for each power level. According to the CC1000 datasheet, 31 output power levels ranging from - 20 to +10dBm can be programmed. The dBm is the measurement of power loss in decibels (dB) using 1 milli-watt (mW) as a reference value.
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LINEAR MINIMUM MEAN-SQUARE-ERROR TRANSCEIVER DESIGN FOR AMPLIFY-AND-FORWARD MULTIPLE ANTENNA RELAYING SYSTEMS

LINEAR MINIMUM MEAN-SQUARE-ERROR TRANSCEIVER DESIGN FOR AMPLIFY-AND-FORWARD MULTIPLE ANTENNA RELAYING SYSTEMS

Linear Minimum Mean-Square-Error Transceiver Design for Amplify-and-Forward Multiple Antenna Relaying Systems
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Điều khiển vị trí động cơ không đồng bộ sử dụng biến tần Vector bằng bộ điều khiển trượt

Điều khiển vị trí động cơ không đồng bộ sử dụng biến tần Vector bằng bộ điều khiển trượt

This paper presents a position control method of asynchronous motors used inverter vector by sliding mode controller (SMC).. Build models of asynchronous motor and setup SMC on software[r]
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KHẢO SÁT THỰC TẾ TRẠM THÔNG TIN DI ĐỘNG TẠI ĐỊA PHƯƠNG – TRUNG TÂM VIỄN THÔNG III – TP BUÔN MA THUỘT

KHẢO SÁT THỰC TẾ TRẠM THÔNG TIN DI ĐỘNG TẠI ĐỊA PHƯƠNG – TRUNG TÂM VIỄN THÔNG III – TP BUÔN MA THUỘT

Hình 2.1.1 : Sơ đồ bố trí thiết bị trong phòng máy mẫu ……… Hình 2.1.2 : Trụ anten ……… TRANG 5 CÁC TỪ VIẾT TẮT --- ---- BSC : Base Station controler ---- Điều khiển trạm gốc - BSS : Ba[r]
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MALVINO-EP-06-BIT

MALVINO-EP-06-BIT

• Works for any IB or VCE • VBE tops out around 0 V TRANG 16 BJT OPERATION REGIONS BJT OPERATION REGIONS _OPERATION_ _OPERATION_ _IB_ _OR VCE_ _BC AND BEBC AND BE_ _MODEMODE_ _OPERATION [r]
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MULTI CARRIER AND SPREAD SPECTRUM SYSTEMS PHẦN 5 PPSX

MULTI CARRIER AND SPREAD SPECTRUM SYSTEMS PHẦN 5 PPSX

3.2.3 Interleaved FDMA (IFDMA) The multiple access scheme IFDMA is based on the principle of FDMA where no mul- tiple access interference occurs [34][35]. The signal is designed in such a way that the transmitted signal can be considered a multi-carrier signal where each user is exclusively assigned a sub-set of sub-carriers. The sub-carriers of the different users are interleaved. It is an inherent feature of the IFDMA signal that the sub-carriers of a user are equally spaced over the transmission bandwidth B , which guarantees a maximum exploitation of the available frequency diversity. The signal design of IFDMA is performed in the time domain and the resulting signal has the advantage of a low PAPR. However, IFDMA occupies a larger transmission bandwidth compared to the rectangular type spectrum with OFDM, which reduces the spectral efficiency.
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BÁO CÁO HÓA HỌC    RESEARCH ARTICLE FAULT TOLERANT TARGET LOCALIZATION IN SENSOR NETWORKS  DOC

BÁO CÁO HÓA HỌC RESEARCH ARTICLE FAULT TOLERANT TARGET LOCALIZATION IN SENSOR NETWORKS DOC

Zou and Chakrabarty [ 6 – 8 ] propose an energy-aware tar- get detection and localization strategy for cluster-based wire- less networks. The cluster head collects event notification from sensors within the cluster and then executes a proba- bilistic localization algorithm to determine candidate nodes to be queried for target information. This algorithm is de- signed only for cluster-based sensor networks. The cluster head must keep a pregenerated detection probability table constructed from sensor locations. Each sensor reports the detection of an object to the cluster head based on its own measurements. This work does not consider fault-tolerance at all, thus the decision by cluster head may be based on in- correct information.
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BÁO CÁO HÓA HỌC   GAUSSIAN CHANNEL MODEL FOR MOBILE MULTIPATH ENVIRONMENT  PDF

BÁO CÁO HÓA HỌC GAUSSIAN CHANNEL MODEL FOR MOBILE MULTIPATH ENVIRONMENT PDF

angle scattering models. However, in a real-life situation, we deal with a single realisation of the angle-spread source, that is, with a fixed finite number of discrete scattering centres. If this number is particularly small, then their center of grav- ity (CofG), defined as a power-weighted average AoA, may “wander” about the true bearing of the UE. The variance of this wandering of the CofG has been obtained. The depen- dence of the AoA estimation accuracy on the parameters of the spread source model has also been considered for a BS us- ing a multibeam antenna, by carrying out simulations of the so-called sum-di ff erence bearing method (SDBM) AoA esti- mation algorithm. It has been shown that for high SNRs, the bearing estimation errors are dominated by the wandering of the CofG of the spread source. This wandering is a con- sequence of the nonergodicity of the angle scattering process and is greater when the number of scattering sources is small.
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ĐIỆN THOẠI DI ĐỘNG VÔ TUYẾN ĐIỆN   TUYÊN TRUYỀN CHANNEL P1 POT

ĐIỆN THOẠI DI ĐỘNG VÔ TUYẾN ĐIỆN TUYÊN TRUYỀN CHANNEL P1 POT

For digital systems it is neither ecient nor desirable to use FDMA/SCPC as a multiple-access technique, and spectrum utilisation is substantially improved by allowing each user access to a wider-bandwidth radio channel, but only for a small percentage of the time. This time division multiple access (TDMA) strategy is used in the GSM and DCS1800 systems. Third-generation systems will be based around wideband code division multiple access (CDMA) and these spread-spectrum systems will o€er even greater capacity and security together with access to multimedia communications. First developed for military purposes, CDMA has virtually no noise or crosstalk and is well suited to high-quality multimedia services. The characterisation of wideband channels will be discussed in Chapter 6; for now it will suce to note that if digital (pulse) signals propagate in a multipath environment then interference can occur between a given pulse and a delayed version of an earlier pulse (an echo) that has travelled via a longer path. This is known as intersymbol interference (ISI) and can cause errors. The extent of the problem can be quanti®ed by propagation studies which measure parameters such as the average delay and the spread of delays.
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Báo cáo hóa học:

Báo cáo hóa học: " Vibrato in Singing Voice: The Link between Source-Filter and Sinusoidal Models" potx

angle scattering models. However, in a real-life situation, we deal with a single realisation of the angle-spread source, that is, with a fixed finite number of discrete scattering centres. If this number is particularly small, then their center of grav- ity (CofG), defined as a power-weighted average AoA, may “wander” about the true bearing of the UE. The variance of this wandering of the CofG has been obtained. The depen- dence of the AoA estimation accuracy on the parameters of the spread source model has also been considered for a BS us- ing a multibeam antenna, by carrying out simulations of the so-called sum-di ff erence bearing method (SDBM) AoA esti- mation algorithm. It has been shown that for high SNRs, the bearing estimation errors are dominated by the wandering of the CofG of the spread source. This wandering is a con- sequence of the nonergodicity of the angle scattering process and is greater when the number of scattering sources is small.
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ETHERNET NETWORKING- P11 PPS

ETHERNET NETWORKING- P11 PPS

Between the Floors SLF's connection to the Internet and backbone interconnections can be found in Figure 14-1. Notice that the routers to each floor connect directly to the edge router. This means that Internet traffic will be split relatively evenly between the two routers (assuming that workstations are allocated relatively evenly between the floors), which should improve performance. In adidtion to the link from the edge router to each floor router, there is a link between the two floor routers. The purpose of this cable is to allow in- ternal traffc, especially that from the fourth floor to the server room, to travel directly to its destination, without being handled by the edge router. This will not only improve internal performance, but should provide addi- tional security for internal traffic, since in most cases such packets won't go outside the firewalls.
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Scalable voip mobility intedration and deployment- P30 docx

Scalable voip mobility intedration and deployment- P30 docx

7.2.1.2 GSM Radio The GSM radio itself is based on the concept of time division multiple access (TDMA). The idea is that the cell’s airtime is divided up into strict slots, or periods of dedicated access. Devices using a bearer channel are assigned a particular, repeating sequence of slots, one for each direction of the voice call. While the call is in progress, the phone is required to send its traffic in one slot and receive in the other. The times in between allow the phone to power down its radios in a predictable way to save power. The overall repeating pattern of slots is called a frame . Each frame repeats nearly every five milliseconds, which means that voice samples have to be packaged up into these short units.
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alcatel-lucent cdma distributed base station portfolio

alcatel-lucent cdma distributed base station portfolio

Enhance coverage in remote locations Distributed base stations can help speed and simplify site acquisition with a “hoteling” application. It currently allows up to twelve miles /20 km (25 miles/40 km in the future) between a base station and an RRH, using the same OA&M. This deployment option expands the num­ ber of sites available to you, while maintaining simple, efficient operations with a centralized base unit.
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BÁO CÁO HÓA HỌC    RESEARCH ARTICLE CHANNEL RESOURCE ALLOCATION FOR VOIP APPLICATIONS IN COLLABORATIVE IEEE 802 11 802 16 NETWORKS  PPT

BÁO CÁO HÓA HỌC RESEARCH ARTICLE CHANNEL RESOURCE ALLOCATION FOR VOIP APPLICATIONS IN COLLABORATIVE IEEE 802 11 802 16 NETWORKS PPT

In the literature, only a few spectrum sharing methods have been proposed for these two types of networks sharing the unlicensed bands (see [ 14 – 16 ], e.g.). In [ 14 ], Berlemann et al. proposed to partially block 802.11 stations to access the medium so that 802.16 could use the same spectrum. In [ 15 ], Jing et al. proposed to utilize the available degrees of freedom in frequency, power, and time, and react to the observations in these dimensions to avoid interference. In [ 16 ], Jing and Raychaudhuri proposed to use a common spectrum coordination channel to exchange the control information in order to cooperatively adapt the key PHY-layer parameters such as frequency and power. All of these existing schemes do not consider the resource allocation issues in the case of delivering tra ffi c between mobile stations and Internet users through an AP and a BS, which share the same frequency band. Soundararajan and Agrawal [ 17 ] proposed to use the IEEE 802.11 AP to collect and relay local tra ffi c to a IEEE 802.16 BS. Through this tra ffi c aggregation via IEEE 802.11 APs, the IEEE 802.16 BS deals with a lesser number of nodes. It has been shown to improve overall system performance. However, the work did not provide any specific algorithm that can achieve optimized resource sharing in this IEEE 802.16/802.11 collaboration. In [ 18 ], Niyato and Hossain proposed applying game theory to resource allocation in the integrated IEEE 802.16/802.11 network. While the use of game theory algorithm maximizes the benefits of each user, it does not guarantee optimized resource allocation for the system.
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BÁO CÁO HÓA HỌC:

BÁO CÁO HÓA HỌC: " RESEARCH ARTICLE INTER- AND INTRASITE CORRELATIONS OF LARGE-SCALE PARAMETERS FROM MACROCELLULAR MEASUREMENTS AT 1800 MHZ" POT

Figure 4: Measurement map and travelled route for the 2005 cam- paign. 4.4. 2005 campaign In contrast to the previous campaign, the 2005 campaign collected data in the downlink. Two BSs with two antennas each were employed (the same type of antenna elements as in the 2004 campaign was used), each transmitting, simultane- ously, one continuous tone separated 1 kHz in the 1800 MHz band. The two base stations were located on the same roof separated 50 meters, with identical boresight and therefore covering almost the same sector. The characteristics of the environment in the measured area are the same as 2004. The routes were di ff erent but with some small overlap. The MS was equipped with the 4-element box antenna as was used
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LECTURE 1: DIGITAL SIGNAL PROCESSING II `ADVANCED TOPICS

LECTURE 1: DIGITAL SIGNAL PROCESSING II `ADVANCED TOPICS

GSM • BASIC NETWORK ARCHITECTURE : -COUNTRY COVERED BY A GRID OF CELLS -EACH CELL HAS A BASE STATION -BASE STATION CONNECTED TO LAND TELEPHONE NETWORK AND COMMUNICATES WITH MOBILES VIA A[r]
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AN1024   PKE SYSTEM DESIGN USING THE PIC16F639

AN1024 PKE SYSTEM DESIGN USING THE PIC16F639

FIGURE 9: EXAMPLE OF HANDSHAKE BETWEEN BASE STATION AND TRANSPONDER Base Station Transmits: Step 1 AGC Stabilization Pulse + Wake-up Filter + 10 bits ID Command + Parity + Stop Bit Trans[r]
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NRF24L01P PRODUCT SPECIFICATION

NRF24L01P PRODUCT SPECIFICATION

SINGLE CHIP 2.4GHZ TRANSCEIVER PRODUCT SPECIFICATION V1.0 KEY FEATURES • Worldwide 2.4GHz ISM band operation • 250kbps, 1Mbps and 2Mbps on air data rates • Ultra low power operation • 11[r]
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Emerging Communications for Wireless Sensor Networks Part 11 doc

Emerging Communications for Wireless Sensor Networks Part 11 doc

caused by this compromise, and the compromised node can still participate in the aggregation activities. 4.2.1.6 Discussion The protocol designers considered data integrity and used µTESLA to defeat type II adversary. The protocol is able to detect a single node compromise, but without further action to remove or isolate this compromised node. Much worse, once a grandfather node detects a node compromise, it could not decide whether the cheating node is its child or grandchild. The protocol, moreover, fails to provide data integrity once the adversary compromised two consecutive nodes successfully in the hierarchy such as the parent and the grandparent. The protocol also suffers from extra memory overhead because of the delayed authentication and the need to buffer the data received by parents to be authenticated later. Finally, parents waste some energy listening to some of the revealed keys that are not intended for them.
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UMTS JAVIER SANCHEZ AND MAMADOU THIOUNE

UMTS JAVIER SANCHEZ AND MAMADOU THIOUNE

DL _f1_ UL _f2_ fr eq uenc y time Guard frequency a FDD mode _f1_ fr eq ue nc y time Guard period b TDD mode UL: Uplink DL: Downlink UL DL DL DL DL UL Base station Base station Mobile te[r]
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BÁO CÁO HÓA HỌC    RESEARCH ARTICLE THE DISPLACEMENT OF BASE STATION IN MOBILE COMMUNICATION WITH GENETIC APPROACH  POTX

BÁO CÁO HÓA HỌC RESEARCH ARTICLE THE DISPLACEMENT OF BASE STATION IN MOBILE COMMUNICATION WITH GENETIC APPROACH POTX

The theoretical basis of GA relies on the concept of schema. A schema is defined as the similarity of templates describing a subset of genomes with similarities in cer- tain chromosomes. Schemata are available to measure the similarity of individuals. John Holland’s schema theorem and building-block hypothesis [4] have often been used to explain how the GA works. According to the schema theo- rem, short, low-order, and above-average schemata receive exponentially increasing trials in subsequent generations. This proves that the individuals with high fitness will have a high survival probability when a suitable representation is applied. The building-block hypothesis suggests that the GA will perform well when it is able to identify above- average-fitness and low-order schemata and recombine them to produce higher-order schemata of higher fitness. In sum, individuals with similar characteristics must be represented by a similar genotype.
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BÁO CÁO HÓA HỌC:

BÁO CÁO HÓA HỌC: " RESEARCH ARTICLE A DESIGN FRAMEWORK FOR SCALAR FEEDBACK IN MIMO BROADCAST CHANNELS" PDF

5. SUM-RATE FUNCTION In this section, we derive a function to approximate the er- godic sum rate that a system with linear beamforming and limited feedback can provide, given knowledge of each user’s SINR metric. A general and simple solution is derived based on the generic metric representation of ξ , given in ( 10 ). Note that the different metrics described in the previous section follow as particular cases of ξ by setting accordingly the val- ues of α , β , γ , and M o . The sum-rate function we provide is a tool that enables simple analysis and comparison of SDMA and TDMA approaches. Moreover, as shown in the simu- lations, it approximates well the system number even when the number of users in the cell is small. In our analysis, we are interested in the actual sum rate that can be achieved. Hence, the metric takes on the meaning of either an upper or lower SINR bound as needed in order to compare SDMA and TDMA in the extreme regimes under study.
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Impact of asymmetrical phenomena on asynchronous three-phase motors in operation mode

Impact of asymmetrical phenomena on asynchronous three-phase motors in operation mode

The general theory of three-phase motors is often built based on the assumption that the three phases voltage is symmetrical. However, in practice, this operation mode of the motor cannot be achieved due to a number of reasons such as the structure of the motor is not symmetrical, the load in the electrical system is not balanced. The asymmetry of threephase voltage greatly affects the operation mode of a three-phase asynchronous motor. The most serious affections are: decrease the starting torque, increase stator current and rotor current, vibration inside the motor. This affection will reduce the effective operation of the motor. The paper investigates the effect of asymmetry voltage on the normal operation mode of a three-phase asynchronous motor based on the electromagnetic transforming method of electric machines and simulating on Matlab-Simulink.
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DANH SACH HOC SINH K11

DANH SACH HOC SINH K11

The simulation of soft handoff follows the IS-95 algorithm. At each MS, the active pilots are determined by computing the pilot signal strength received from all BSs. MS is assumed to be in handoff with all BSs having an average pilot signal strength within 6 dB of the strongest serving site, so ∆ is set to 6 dB in (23). The parameters of active and candidate set evaluation are: T Add = − 12 dB , T Drop = − 16 dB and T T Drop = 3 s . In soft handoff, the transmit power is allocated on uplink and downlink according to the strongest base station pilot.
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Cellular Networks Positioning Performance Analysis Reliability Part 9 doc

Cellular Networks Positioning Performance Analysis Reliability Part 9 doc

Two environments are simulated: an indoor environment in an office with soft partitions and an outdoor environment in a shadowed urban area. In order to account for fading as well as mobility, slow and fast fading are simulated in the channel model, since they affect the signal strength of the MS channel measured by BS. Other parameters of fading and mobility simulation are shown in Table 1.
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Báo cáo hóa học:

Báo cáo hóa học: " Research Article Cross-Layer Handover Scheme for Multimedia Communications in Next Generation Wireless Networks" potx

e Figure 15: Relationship between the RTP data rate and the NAR’s buffer size. In this scheme, FMIP is introduced into the SIP and MIH combination architecture. By using FMIP, the NCoA can be obtained in advance, and data packets are bu ff ered and forwarded to both NCoA and PCoA while the previous link quality is poor. Hence, our scheme can significantly reduce data packet loss as well as service interruption time. Moreover, our simulation results obtained by the NS2 simulator show that the proposed FASM has better handover performance than OSM, for example, the service interruption time is reduced by about 50 percent when the ratio of the receiving power of LGD to that of LD is 1.1. The proposed mechanism has the ability to achieve the handover of “seamless end-to-end services” in heterogeneous networks.
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TẠO NETWORK DRIVE BẰNG AIRDISK TRONG OS X PPT

TẠO NETWORK DRIVE BẰNG AIRDISK TRONG OS X PPT

Tạo Network Drive bằng AirDisk trong OS X Có rất nhiều cách làm cho việc sử dụng một network drive ở nhà trở nên cực kỳ hữu dụng. Dù bạn muốn backup, chia sẻ file hay stream media từ nhiều máy tính,… nhanh chóng và dễ dàng, network drive chính là một cách thuận tiện và dễ dàng cho việc thực hiện đó nếu thiết lập đúng cách. Chính vì vậy trong bài này chúng tôi sẽ giới thiệu cho các bạn cách tạo một network drive bằng Airport Extreme Base Station (AEBS) trên máy tính Mac.
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