Wireless data technologies reference handbook phần 2 doc

... the use Wireless Data Technologies. Vern A. Dubendorf  20 03 John Wiley & Sons, Ltd ISBN: 0-470-84949-5 6 A HISTORY OF WIRELESS TECHNOLOGIES 1.4 Voice Technologies In the November 7, 1 920 issue ... a 9600 bps rate family in the three data- bearing channel types. In all cases the FEC code rate is 1 /2 and the PN rate is 1 .22 88 MHz. Note that 1 .22 88 MHz = 128 × 9600 bps....

Ngày tải lên: 09/08/2014, 19:22

... PROTOCOLS 41 28 Training 1 S 57 Encrypted 1 S 3 T 3 T 8 .25 GP 158 .25 BHs (577 µs) TN0 TN1 TN2 TN3 TN4 TN5 TN6 TN7 123 4567891011 121 314151617181 920 2 122 23Idle BACCH 24 TC × 4.616 ms = 120 ms Logical ... n FDMA FDMA 123 123 124 Channel 25 MHz 25 MHz Downlink MS Tx 890 MHz 935 MHz Uplink MS Tx 915 MHz 123 123 124 20 0 kHz TDMA FRAME 4.615 ms TN 7 TN 6 TN 5 TN 4 TN 3 TN 2 TN 1...

Ngày tải lên: 09/08/2014, 19:22

... network. 7.4 Spectrum for UMTS WRC 20 00 identified the frequency bands 1885 20 25 MHz and 21 10 22 00 MHz for futureIMT -20 00 systems, with the bands 1980 20 10 MHz and 21 70 22 00 MHz intended for the satellite ... DECT UNITS UMTS MSS Up UMTS UMTS MSS Dwn UMTS MSS FPLMTS MSS 1700 1800 24 68 0000 1900 24 68 0000 20 00 24 68 0000 21 00 24 68 0000 22 00 MSS = Mobile Satellite System...

Ngày tải lên: 09/08/2014, 19:22

... source address field 23 2 INDEX WEP 195 Wired Equivalent Privacy 3 WEPcrack 1 42 WinDump 141 W-INFOSEC 187, 188, 190, 1 92, 194, 196, 198, 20 0, 20 2, 20 4 Wired Equivalent Privacy, see WEP Wireless Application ... multiframes 47 5 52- multiframe 47 8 8 02. 11 81 8 02. 11a 81 8 02. 11b 81 8 02. 15 1 02 8 02. 16 158 8 02. 3 81 A access grant channel (AGCH) 43 AiroPeek 141 AirSnort 1 42...

Ngày tải lên: 09/08/2014, 19:21

... 36 3.1.1 Color Coding 36 3.1 .2 Interlacing 37 3.1.3 Compression Methods 38 3.1.4 Standards 39 3 .2 Artifacts 42 3 .2. 1 Compression Artifacts 42 3 .2. 2 Transmission Errors 45 3 .2. 3 Other Impairments 47 3.3 ... Definitions 72 4.1 .2 In-phase and Quadrature Mechanisms 73 4.1.3 Isotropic Local Contrast 76 4.1.4 Filter Design 80 4 .2 Perceptual Distortion Metric 82 4 .2. 1 Metric Desig...

Ngày tải lên: 09/08/2014, 19:21

... proprietary. For a more detailed overview of video compression technologies the reader is referred to Symes (20 03). 3 .2 ARTIFACTS 3 .2. 1 Compression Artifacts As pointed out in section 3.1.4, the ... separate visual channels (see section 2. 5 .2) . Furthermore, chromatic visual acuity is significantly lower than achromatic acuity, as pointed out in section 2. 4 .2. In order to take adv...

Ngày tải lên: 09/08/2014, 19:21

... back 2 3 4 5 6 7 8 5 10 15 20 25 30 D/H Visual angle [deg] 2 3 4 5 6 7 8 5 10 15 20 25 30 35 40 D/H Resolution [cpd] HDTV (1080 lines) HDTV ( 720 lines) PAL (576 lines) NTSC (486 lines) CIF (28 8 ... Opp. steerable pyr. W C ð’Þ L 2 ,L 4 R See Sections 4 .2 and 5 .2 (VQEG) Winkler (20 00) VQ various steerable pyr. W C ð’Þ various R See Section 5.3 Masry and Hemami (20 04) VQ...

Ngày tải lên: 09/08/2014, 19:21

... i.e. X 1 j¼À1 ^ 2 j rÞ     2 ¼ 1 ð4:9Þ and X 1 j¼ÀJ ^ 2 j rÞ     2 ¼ ^  2 J rÞ     2 : ð4:10Þ where  is the associated 2- D scaling function (Mallat and Zhong, 19 92) . Now it is ...  ð ~ xxÞ¼ 1  ~  ~ xx ffiffiffi  p  ; ð4:15Þ where ~  ðx; yÞ¼ ðÀ1Þ  2 À1 ð À1Þ! @ 2 @x 2 þ @ 2 @y 2   e À x 2 þy 2 2 : ð4:16Þ The integer parameter  controls t...

Ngày tải lên: 09/08/2014, 19:21

... resolution). Table 4 .2 Contrast gain control parameters bk pq W-B 6.968 0 .29 778 2. 1158 2 R-G 21 .904 0.11379 2. 3447 2 B-Y 13.035 0.077 12 2 .27 88 2 98 MODELS AND METRICS 10 –1 10 0 10 1 –45 –40 –35 –30 25 20 –15 Spatial ... for q ¼ 2, k ¼ 1, and no pooling. Solid line: p ¼ 2: 4, b 2 ¼ 10 À4 . Dashed lines from left to right: p ¼ 2: 0; 2: 2; 2: 6; 2: 8. Dotted line...

Ngày tải lên: 09/08/2014, 19:21

... MPEG -2 8-4.5 Mb/s 2 generations 6 MPEG -2 8 Mb/s Composite PAL/NTSC 7 MPEG -2 6 Mb/s 8 MPEG -2 4.5 Mb/s Composite PAL/NTSC 9 MPEG -2 3 Mb/s 10 MPEG -2 4.5 Mb/s 11 MPEG -2 3 Mb/s Transmission errors 12 ... Transmission errors 12 MPEG -2 4.5 Mb/s Transmission errors 13 MPEG -2 2 Mb/s 3/4 resolution 14 MPEG -2 2 Mb/s 3/4 horizontal resolution 15 H .26 3 768 kb/s 1 /2 resolution...

Ngày tải lên: 09/08/2014, 19:21