3g mobile hotspot free download

... System 15 Third-Generation (3G) Wireless Technology 16 3G Requirements 18 Evolution to 3G Systems 21 Summary 23 References 25 Chapter 2 Propagation Characteristics of a Mobile Radio Channel 27 Large-Scale ... most important features of 3G. Because of the many advantages that it offers, the CDMA technology forms the basis of 3G systems. References [1] W.R. Young, “Advanced Mobile Phone Service: Introduction, Background, ... k>r n 33 Propagation Characteristics of a Mobile Radio Channel 10 0 10 1 10 2 0 10 20 30 40 50 60 70 80 90 Distance (km) Attenuation (dB) with free space at 1 km 1 2 3 4 5 1 - Freespace 2 - Antenna Ht = 820m,...

Ngày tải lên: 02/03/2013, 16:58

... different aspects of 3G mobile communi- cations. They developed algorithms and air interfaces, performed simulation, built prototypes, and conducted field tests to verify their validity. 3G partnership ... received by a mobile antenna in and around Tokyo in the frequency band from 200 MHz to 1,920 MHz using different base station and mobile antenna heights. Black and Reudink [19] studied the mobile radio ... authors indicate that the signal strength received by a mobile would depend 31 Propagation Characteristics of a Mobile Radio Channel Base Station Antenna Mobile Antenn a Direct Ray Reflected Ray r h t h r Figure...

Ngày tải lên: 23/12/2013, 01:17

... systems. 13 Also, because a mobile radio channel is time varying, and because the signal at a mobile antenna is subjected to a Doppler shift that varies with the mobile velocity, the signal frequency ... most important features of 3G. Because of the many advantages that it offers, the CDMA technology forms the basis of 3G systems. References [1] W.R. Young, “Advanced Mobile Phone Service: Introduction, Background, ... k>r n 33 Propagation Characteristics of a Mobile Radio Channel 10 0 10 1 10 2 0 10 20 30 40 50 60 70 80 90 Distance (km) Attenuation (dB) with free space at 1 km 1 2 3 4 5 1 - Freespace 2 - Antenna Ht = 820m,...

Ngày tải lên: 18/06/2014, 10:05

... codes. Walsh Codes Various physical channels may exist at any time on a radio interface of a 3G system. For example, at a mobile station, there may be one or more dedicated physical data channels, a dedicated ... desired speech signal. The filter coefficients are determined 69 Principles of Wideband CDMA (W-CDMA) Mobile Communications System Speech Coding Algorithm IS-54/IS-136 Vector-Sum Excited Linear Predictive Coding ... kb/s, the output of the coder is 244 bits for every 20-ms frame. Table 3-2 Speech encoders used in mobile communications systems into two streams, each of which BPSK-modulates the carrier. Conse- quently,...

Ngày tải lên: 18/06/2014, 10:05

... maximum number of mobile stations that can be served in a CDMA system) is maximum when the transmitter power of each mobile station is adjusted such that the received SIR from each mobile is just ... the fig- Chapter 4 122 Mobile Radio Systems,” IEEE Trans. Veh. Technol., Vol. VT- 39, No. 1, pp. 56 — 67, February 1990. [38] S. Anderson, et al., “An Adaptive Array for Mobile Communi- cations ... signals simultaneously from two mobile stations, one close to the base sta- tion and the other farther from it near the edge of a cell. Because UE1 is closer than UE2, if both mobile stations are transmitting...

Ngày tải lên: 18/06/2014, 10:05

... parameters. The EIR con- tains the International Mobile station Equipment Identity (IMEI) numbers of all mobile stations that are registered. Each mobile is assigned a unique IMEI number that can ... a mobile station can use for timing recovery and synchronization. An exact copy of this sequence is stored in the mobile memory. Thus, by comparing the received sequence with this copy, a mobile ... explained in the next section. Figure 5-3(a) represents the transmitter of a mobile station. The speech signal from a mobile terminal is encoded into 13-bit uniform pulse code modulation (PCM)...

Ngày tải lên: 18/06/2014, 10:05

... signal level from all mobile stations in the cell, thereby preventing a single mobile (which may happen to be closer to the base station) from swamping out the sig- nals from other mobiles. Rate matching ... Institute (ETSI)/Special Mobile Group (SMG) developed two standards for International Mobile Telecommunication in the year 2000 (IMT-2000). One of them is the Universal Mobile Telecommunications ... which mobile station (or application) can use the next uplink RLC block on the same time slot. In this way, dif- ferent mobile stations may be multiplexed on the same PDCH when necessary. A mobile...

Ngày tải lên: 18/06/2014, 10:05

... num- ber of these channels have to be transmitted using a single CDMA carrier. As an example, a mobile station may have a number of uplink DPDCHs as well as a DPCCH. In this case, the channels ... steps of 1 / 15 . Because the resulting real-valued symbol sequences, indicated 225 Universal Mobile Telecommunications System (UMTS) Physical Channel A I X X X X o o o 11 C 12 C 11 G 12 G Physical Channel ... Y X Q Complex Scrambling Code To Modulator + 0 90 ⌺ ⌺ Figure 6-18 Spreading multiple physical channels from a mobile station 14 In other words, we are going to use binary phase shift keying. 15 Each set modulates...

Ngày tải lên: 18/06/2014, 10:05

... Channel Coding. [11] 3GPP TS 25.213, Spreading and Modulation (FDD). [12] 3GPP TS 25.214, Physical Layer Procedures. [13] 3GPP TS 25.215, Physical Layer — Measurements. [14] 3GPP TS 25.302, Services ... Protocols [15] 3GPP TS 25.321, MAC Protocol Specification. [16] 3GPP TS 25.322, RLC Protocol Specification. [17] 3GPP TS 25.323, Packet Data Convergence Protocol (PDCP) Specification. [18] 3GPP TS 25.324, ... Points [21] 3GPP TS 25.410, UTRAN Iu Interface: General Aspects and Principles. [22] 3GPP TS 25.411, UTRAN Iu Interface: Layer 1. [23] 3GPP TS 25.412, UTRAN Iu Interface: Signaling Transport. [24] 3GPP...

Ngày tải lên: 18/06/2014, 10:05

... virtual connections between two IntServ-capable routers [11], [16]. RSVP for Mobile Systems Problems arise when standard RSVP is used in a mobile communi- cations network. Reference [11] has studied these ... developed by 3G only apply to the UMTS radio bearer service. The objective of this chapter is to provide the reader with a basic understanding of the subject. 299 Quality of Service (QoS) in 3G Systems Figure ... the features of the two models. The chapter concludes with a discussion of how a 3G network can provide QoS to a mobile sta- tion as it is handed over from one cell to another in the same serving area,...

Ngày tải lên: 18/06/2014, 10:05

... users because it assumes that the power control of the mobiles in this cell is perfect and that the interference to mobiles in any sector due to mobiles in the other two sectors is zero, assump- tions ... [13] has suggested another protocol called Mobile IP with Location Register (MIP-LR) for mobile wireless networks. According to this protocol, when a mobile station moves into a for- eign serving ... manufacturing 3G wire- less equipment so that service providers can begin to roll out 3G ser- vices to their customers in the near future. NTT DoCoMo of Japan has been actively developing 3G technologies....

Ngày tải lên: 18/06/2014, 10:05

... 49–50 mobile radio signals, 28 mobile stations, 3G systems, 20 mobile systems, 325–327 modulation, 79 BPSK, 80 DQPSK, 111 MSK, 166–168 OQPSK, 111 QPSK, 80, 110 monitoring VC traffic, 318 MRSVP (Mobile ... 314 microcells, 19 MIP-LR (Mobile IP with Location Register), 328 MJ mobile system, 2 MK system, 3 MM (Mobility Management), 278 mobile phone systems, early models, 2–3 mobile radio channels large-scale ... (International Mobile Station Equipment Identity), GSM, 159 IMT-2000 (International Mobile Telecommunication in the year 2000), 17 inner loop power control, UMTS, 219 interactive 3G traffic, 304 interleaving,...

Ngày tải lên: 18/06/2014, 10:05

... codes. Walsh Codes Various physical channels may exist at any time on a radio interface of a 3G system. For example, at a mobile station, there may be one or more dedicated physical data channels, a dedicated ... desired speech signal. The filter coefficients are determined 69 Principles of Wideband CDMA (W-CDMA) Mobile Communications System Speech Coding Algorithm IS-54/IS-136 Vector-Sum Excited Linear Predictive Coding ... kb/s, the output of the coder is 244 bits for every 20-ms frame. Table 3-2 Speech encoders used in mobile communications systems includes 38 bits of LP parameters, 30 bits of pitch delay, 16 bits...

Ngày tải lên: 18/06/2014, 16:20

... maximum number of mobile stations that can be served in a CDMA system) is maximum when the transmitter power of each mobile station is adjusted such that the received SIR from each mobile is just ... so that mobile stations can synchronize to a base station. This signal can also be used as a reference in coherent demodulation and timing recovery at a mobile station. Similarly, a mobile station can ... downlink channel so that each mobile station receives a satisfactory signal level from the base sta- tion. In this case, the algorithms are usually closed loop where each mobile station measures the...

Ngày tải lên: 18/06/2014, 16:20

... a mobile station can use for timing recovery and synchronization. An exact copy of this sequence is stored in the mobile memory. Thus, by comparing the received sequence with this copy, a mobile ... parameters. The EIR con- tains the International Mobile station Equipment Identity (IMEI) numbers of all mobile stations that are registered. Each mobile is assigned a unique IMEI number that can ... the receiver [3], [4]. A dedicated auxiliary pilot channel is dedicated to a given mobile station (or a group of mobile stations) for the purpose of beam steer- ing using an adaptive antenna array. A...

Ngày tải lên: 18/06/2014, 16:20

Ngày tải lên: 18/06/2014, 16:20

Ngày tải lên: 18/06/2014, 16:20

Ngày tải lên: 18/06/2014, 16:20

Ngày tải lên: 18/06/2014, 16:20

Ngày tải lên: 18/06/2014, 16:20