The representation of servant and compare the thre

Three 3G ,PULSERA NEGRA CON ARGENTINA
domestic production - China Mobile TD-SCDMA, China Unicom WCDMA,PULSERA AZUL CON LOGO XB, China Telecom CDMA2000
1st 3G product of the elementary parameters
1. the whole of China Mobile TD-SCDMA is called Time Division-Synchronous CDMA (time division synchronous CDMA)
RTT TDD-CDMA system, a GPS chip rate bandwidth of 1.6Mhz to 1.28Mcps nation band 1880-1920,2010-2025 Mhz

2. The full label of China Unicom's WCDMA Wideband CDMA
RTT FDD asynchronous CDMA system, no GPS chip rate bandwidth for the 3.84Mcps 5Mhz country band 1920-1980/2110-2170/1755-1785/1850-1880Mhz
3. China Telecom CDMA2000 technology is amplified from the narrow-band CDMA IS95 CDMA technology for broadband
RTT FDD-CDMA system has a GPS chip rate bandwidth 1.23Mhz 1.2288Mcps country band 1920-1980/2110-2170/1755-1785/1850/1880Mhz

comparison:
WCDMA TD-SCDMA CDMA2000 can be provided in the stationary state 2Mbit / s data transmit rate,PULSERA BLANCA CON MEXICO, the 3 key technologies there are colossal differences in performance are also different.

1. chip rate and carrier bandwidth
TD-SCDMA uses 1.28Mchip / s of the chip rate, using TDD duplex mode, because it is so time-full-duplex mode only for the occupation of a single 1.6M O bandwidth can mail 2Mbit / s file services . The WCDMA and CDMA2000 to send 2Mbit / s file services necessitate 2 symmetrical bandwidth. TD-SCDMA and thus the utilization of frequency resources is the maximum.

WCDMA (FDD-DS) means using straight sequence scatter spectrum, chip rate is 3.84Mchip / s. CDMA20001X and CDMA20003x difference is the number of another carriers, 1x single conveyor, chip rate is 1.2288Mchip / s,PULSERA AZUL CON BANDERA, CDMA20003x for the three-carrier chip rate 1.2288 * 3 3.6864Mchip / s. Chip rate frequency-selective use of energy-efficient and space diversity receive and transmit diversity, can mainly solve the problem and the multipath fading problem. Carrier bandwidth is high, the extra the number of consumers supported in the communication the likelihood of congestion on the small. WCDMA in this regard has apparent avails.

2. duplex mode
WCDMA and CDMA2000 are using FDD (frequency division digital duplex) mode, TD-SCDMA is the color accustomed in TDD (time division digital duplex) mode
FDD into the frequency, the downlink symmetry operations
TDD is the transmission of upwards and downstream duplex mode using the same frequency orchestra, according to the period apt distinguish between up and down the line and switch
TDD spectrum efficiency high and costs low, but non-consecutive multi-slot transmission mode, the found station transmitter pinnacle power and average power ratio higher, resulting in higher power bottom stations, base station coverage radius is small, also result in anti-fading and anti-poor performance of Doppler shift, when the mobile apparatus when in a state of high-speed mobile communications meager.
WCDMA and CDMA2000 can assist mobile devices is about 500 km per hour while in the regular communication,PULSERA BLANCA CON NETHERLANDS, and TD-SCDMA mobile extremities can merely support approximately 120 kilometers per hour, ashore the expressway and railroad and other high-speed mobile context by a disadvantage in the TD-SCDMA .

other narrated technologies such as the antenna. . . Handoff technology, time afterward time to write. . . Hey ~~~~
can not understand the answer ~ ~ ~ see to understand the same can remark. . .
fair alteration a few typos, written brim to brim, typos inevitably, amuse reply to advise that typo,PULSERA TRANSPARENTE CON FRANCIA, so I am humiliated Thank you
typo to corner over the red part is the edition of the word, thank you aid me detect a typo

[ug7ioi2md]

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136267 2010 年 01 月 24 日 10:49 Reading (loading. ..) Comments (5) Category: Personal Diary
After reading the Avatar,new new balance shoes, or the legendary I-MAX 3D, two ideas
First, the demolition Edition
developers in a hurry, need to move indigenous people, sent two working groups, one to do ideological work (thought groups),new balance 574, a preparation forcibly removed (force group). As a developer, as long as to achieve the purpose,People to tears philosophy of life - Qzone log,new balance running shoes, which made the effectiveness of the working group does not matter,new balance outlet, so are from the capital, technology and talent to support it. But in the work process,new balance sneakers, the thinking group of gay and being evicted, a princess in love, the necessity of the demolition work, the legitimacy of the question that is not compared to demolition and relocation, it is more good than harm This thinking in turn affected the whole team. The covert group from the beginning to help relocatees, and then clear support for the relocatees. This allows developers to work on the ideological group is dissatisfied with the full support of forcibly apart and turn and eventually decided to take 强拆 measures. The demolitions of the former, the developer boss ignored the indigenous people (Eva) survey, the overall strength of the opponents do not understand the circumstances, the mere opponents demonstrated outside power to judge, rash action, leading to the demolition work failure. Avatar tells us, 1. Demolition is very difficult; 2 on the nail house a comprehensive understanding of the background is necessary; 3. In the interests of the face, with the exception of the hero can see the historical process, the ideological work is carried out as difficult.

Second, the system version
seen Avatar, Pandora is a huge feeling of the whole network system, the system has a central server (Eva Virgin), a network of workstations (Holy Mountain), a common node (Navier-person); and the connection system has an online connection (Holy Mountain and Eva connection), there are off-line connection (Navier people can not immediately connect with Eva); from the perspective of information dissemination is completely two-way (Navier people Eva can pray to Our Lady of the forest can also give directions to other species).
whole Pandora system, most people gasp in admiration of the planet is the interface design. I can say that the designer of Pandora,自强不息 厚德载物 - Qzone日志, extreme worship, the designers proficient in system design theory, design high degree of unity, especially the interface design is to ease and the point, whether the communication between the Navier Navier-man and Our Lady (the interface between plants and animals) or Navier-man and 潘多拉烈马 (Direhorse), bats? beast (Banshee), bats? Long (Great Leonopteryx), hammer Ultralisk (Hammerhead Titanothere) of these different species communication between the communication can be through a unified interface (braids back of his head) to achieve. The implementation of this interface not only means that the underlying physical interface (electrical) specifications to the uniform (current, voltage, frequency), and have a consistent semantics and grammar. And from the video point of view, this unity is not designed to maintain the unity of the beginning,new balance mens,分享DOTA 屠夫铃声 - Qzone日志, but communication Unicom, after a simple run-in, you can achieve a unified adaptive (the protagonist to learn horse riding).

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