Next generation wireless systems and networks phần 8 docx

... various wireless applications, such as wireless regional area networks (WRANs), wireless metropolitan area networks (WMANs), wireless local area networks (WLANs), and wireless personal area networks ... U-NII band or the ISM band, it is called a Licensed Band Cognitive Radio. One of the Licensed Band Cognitive Radio-like systems is the IEEE 80 2.15 Task group 2 [80 2] s...

Ngày tải lên: 09/08/2014, 19:22

... (t) t + + + = 8 8 8 8 R A,B (t) t 8 8 R A 3 ,B 3 (t) t 8 8 Absolutely no sidelobes! Figure 2.34 Cross-correlation function of an orthogonal complementary code with its element code length being 16 and ... errors, and so on. developed in North America in the 1 980 s by AT&T’s Bell Laboratories. It operates in 80 0–900 MHz frequency band and is one of numerous first gene...

Ngày tải lên: 09/08/2014, 19:22

... mobile cellular systems. The third generation wireless is a term used to describe next generation mobile services, which provide better quality voice and high-speed Internet and multimedia services. ... channels more efficiently, D-AMPS (IS-136) employs the same 30 kHz channel spacing and frequency bands (82 4 84 9 and 86 9 89 4 MHz) as AMPS. By using TDMA instead of FDMA, IS...

Ngày tải lên: 09/08/2014, 19:22

... PCS networks. QPSK modulation is used to achieve 38. 4 kbps through 12 28. 8 kbps data rates (with the exception of 921.6 kbps), 8PSK for 921.6 kbps and 184 3.2 kbps and 16QAM for 12 28. 8 kbps and ... rate (kb/s) 38. 4 76 .8 153.6 307.2 307.2 614.4 614.4 921.6 12 28. 8 12 28. 8 184 3.2 2457.6 Modem QPSK QPSK QPSK QPSK QPSK QPSK QPSK 8PSK QPSK 16QAM 8PSK 16QAM Encoded 1024/ 1024/ 102...

Ngày tải lên: 09/08/2014, 19:22

... telecommunication services: PSTN and IP networks. Next Generation Wireless Systems and Networks Hsiao-Hwa Chen and Mohsen Guizani  2006 John Wiley & Sons, Ltd 234 WIRELESS DATA NETWORKS • Up to eight ... WPAN [ 482 ]. The 80 2.15 standards permit WPANs to connect to 80 2.11 WLANs or 80 2 (wired) LANs, if desired [ 482 ]. 4.4.1 IEEE 80 2.15.3a Standard The IEEE 8...

Ngày tải lên: 09/08/2014, 19:22

... time, and every active user is assigned a particular time slot in the Next Generation Wireless Systems and Networks Hsiao-Hwa Chen and Mohsen Guizani  2006 John Wiley & Sons, Ltd 2 78 MULTIPLE ... infinite, and 262 ARCHITECTURE OF B3G WIRELESS SYSTEMS Reconfigurability and spectrum issues are changing the way wireless networks are planned. Planners are mindful...

Ngày tải lên: 09/08/2014, 19:22

... channel, and g(τ) is the com- bined effect of the transmitter pulse-shaping and the receiver matched-filtering. Thus, the received Next Generation Wireless Systems and Networks Hsiao-Hwa Chen and Mohsen ... Ltd 2 98 MULTIPLE ACCESS TECHNOLOGIES FOR B3G WIRELESS Figure 7. 18 Various IEEE 80 2 standards, in which UWB technologies have been covered in IEEE 80 2.15.3a stand...

Ngày tải lên: 09/08/2014, 19:22

... kHz Sampling frequency 1.92 MHz (1/2 × 3 .84 MHz) 3 .84 MHz 7. 68 MHz (2 × 3 .84 MHz) 15.36 MHz (4 × 3 .84 MHz) 23.04 MHz (6 × 3 .84 MHz) 30.72 MHz (8 × 3 .84 MHz) FFT size 1 28 256 512 1024 1536 20 48 Number of occupied subcarriers a 76 ... subsection in the sequel. Next Generation Wireless Systems and Networks Hsiao-Hwa Chen and Mohsen Guizani  2006 John Wiley &...

Ngày tải lên: 09/08/2014, 19:22

... bluetooth, 383 80 2.15.3, 303 80 2.15.3a, 270, 297, 2 98, 303, 382 , 383 80 2.15.3a standard, 2 98 802.15.3a wireless UWB standard, 384 80 2.15.4, 2 98, 382 80 2.15.4a, 270, 2 98 802.16, 9, 2 98, 389 , 391 80 2.16 ... 391 80 2.16 standard, 2 98, 392 80 2.16e standard, 389 80 2.16h, 15, 389 80 2. 18, 366 80 2.19, 370 80 2.20, 249, 2 98 802.22, 15, 2 98, 389 , 391, 392, 393 80...

Ngày tải lên: 09/08/2014, 19:22

... States 202 ,88 8,307 296,2 08, 476 68. 5 21.6 China 103,000,000 1, 282 ,1 98, 289 7.9 11.0 Japan 78, 050,000 1 28, 137, 485 60.9 8. 3 Germany 47,127,725 82 ,726, 188 57.0 5.0 India 39,200,000 1,094 ,87 0,677 3.6 ... Kingdom 35 ,80 7,929 59 ,88 9,407 59 .8 3 .8 South Korea 31,600,000 49,929,293 63.3 3.4 Italy 28, 610,000 58, 6 08, 565 48. 8 3.0 France 25,614 ,89 9 60,619,7 18 42.3 2.7 Bra...

Ngày tải lên: 03/06/2014, 01:05