Sideseadmed (IRT0040)
loeng 3/2010
Avo
[email protected]
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Multimeediakiip
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CE 3100
• Intel® Pentium® M processor core at 800MHz and 256K L2
Cache, with leading-edge multi-stream high-definition video
decoding and processing hardware, including support for MPEG-2,
H.264 and VC-1 with HDMI 1.3a output, and featuring advanced 4field per pixel motion-adaptive de-interlacing and 9-tap, 128-phase,
independent horizontal and vertical scalers.
It also adds a 3-channel 800 MHz DDR2 memory controller
supporting tiled memory mapping and channel interleaving,
dedicated multi-channel dual audio DSPs with support for 7.1
surround sound implementing advanced audio codecs, including
support for Blu-ray requirements.
Lingid
http://download.intel.com/design/celect/downl
oads/ce3100-product-brief.pdf
http://www.intelconsumerelectronics.com/
http://connectedtv.yahoo.com/developer
http://security.cloakware.com/datasheets/dscds-drm-Intel-CE-3100.pdf
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Nõuded GPS kiipidele
• Teistest olulisemalt kerkib esile kaks parameetrit:
• Vastuvõtja tundlikus.
• Võimalikult minimaalne TTFF (“Time to First Fix”)
ja TTSF (“Time to Subsequent Fix”) ajaintervall.
• Muidugi on olulised ka teised parameetrid nagu
kiibi energiatarve, asukoha määramise täpsus,
millistes sagedusalades võib veel töötada…
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Tuntumad kiipide tootjad
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Vastuvõtja kõrge tundlikkus
• Oluline, kuna signaali saatvad satelliidid asuvad maapinnast umbes
20200 km kaugusel. Juba sumbuvus vabas ruumis omab väärtust -182
dBW
• Kui satelliit kiirgab välja signaali võimsusega 27 dBW L1 sagedusel
(1575.42 MHz), siis maale jõuab sellest teoreetiliselt umbes -155 dBW
(-125 dBm).
• Kui seade paikneb suurhoonete vahel/sees on sumbuvus veelgi
suurem. Lisaks sumbumisele häirib vastuvõttu veel signaali multiteelevi.
• Seetõttu peavad kiipide RF signaali vastuvõtuplokid olema eelkõige
väga kõrge tundlikkusega ja laia dünaamilise diapasooniga.
• Tänapäeva kiibid suudavad tuvastada signaale kuni kuskil -160 dBm
nivoo seest.
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“Time to First Fix”
• TTFF on parameeter, mis kulub satelliitide signaali vastuvõtmiseks,
koodide korreleerimiseks ja ajaintervalli paikaseadmiseks ning lõpuks
sideseadme enda asukoha väljaarvutamiseks.
• Kuigi kiip suhtleb sideseadme enda tarkvaraga, siis GPS kiipidesse
pannakse siiski sisse vastav digitaalne signaaliprotsessor, mis need
ülesanded peab lahendama. Ja seda ka sideseadme liikumise ajal.
• Tegemist on ühe tähtsaima komponendiga nende kiipide koosseisus.
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Qualcomm gpsOne
• Supports multiple modes of GPS, inclusive of standalone,
MS-Based, MS-Assisted, Hybrid, and gpsOneXTRA™
Assistance
• Enables enhanced standalone GPS through gpsOneXTRA
Assistance
• Supports – 160 dBm tracking sensitivity
• Standalone TTFF Hot, Warm Cold (1s/29s/35s)
respectively
• Compatible with Qualcomm's QPoint Location Based
Server as well as 3GPP and GERAN compliant location
servers supporting UMTS control plane and GSM control
plane and OMA SUPL 1.0
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SiRFstarIII GSC3LTi and GSC3LTif
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eRide OPUS III Chipset
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eRide OPUS III Chipset
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Fujitsu MB87Q2040 and MB15H156
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7 mm × 7 mm 48-pin and 5 mm × 5 mm 32-pin BCC plastic
UMTS/WCDMA, GSM/GPRS, PDC and CDMA technologies
The RF front-end chip (MB15H156), based on Fujitsu's BiCMOS process,
integrates most RF externals and features on-chip IF filters, VCO, PLL,
oscillators and LNA, resulting in a reduced BOM cost and component count
and minimizing the board area.
The baseband chip (MB87Q2040) incorporates a highly optimized GPS/AGPS
baseband IP licensed from eRide Inc.
The acquisition/tracking engine on the chip has 44,000 effective correlators,
resulting in high indoor sensitivity calibrated to -157.5 dBm and indoor
accuracy of <20 m. The chipset meets FCC-E911 requirements for October
2005. The solution achieves fast TTFF of <1 s when hot and around 32 s when
cold for outdoors fixes. The employment of power-saving techniques with the
0.11 um technology results in a peak baseband power dissipation of 67 mW
during low signal strength acquisition, while the continuous tracking (1Hz
update rate) power dissipation is less than 40 mW.
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