The representation of servant and compare the thre

Three 3G
servant product - China Mobile TD-SCDMA, China Unicom WCDMA, China Telecom CDMA2000
premier 3G product of the basic parameters
1. the whole of China Mobile TD-SCDMA is phoned Time Division-Synchronous CDMA (time division synchronous CDMA)
RTT TDD-CDMA system, a GPS chip rate bandwidth of 1.6Mhz to 1.28Mcps country band 1880-1920,2010-2025 Mhz

2. The full label of China Unicom's WCDMA Wideband CDMA
RTT FDD asynchronous CDMA system, not 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 developed 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 invested in the stationary state 2Mbit / s data migrate rate, the three key technologies there are large 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,PULSERA TRANSPARENTE CON LOGO XB, because it is so time-full-duplex mode only for the occupation of a single 1.6M O bandwidth can send 2Mbit / s data services . The WCDMA and CDMA2000 to send 2Mbit / s data services require two symmetrical bandwidth. TD-SCDMA and accordingly the utilization of frequency resources is the highest.

WCDMA (FDD-DS) usage using straight series scatter spectrum, piece rate namely 3.84Mchip / s. CDMA20001X and CDMA20003x difference is the number of alter carriers, 1x single carrier, chip rate is 1.2288Mchip / s, CDMA20003x for the three-carrier chip rate 1.2288 * 3 3.6864Mchip / s. Chip rate frequency-selective use of energy-efficient and space variety receive and transmit diversity,PULSERA BLANCA CON NETHERLANDS, can mainly solve the problem and the multipath fading problem. Carrier bandwidth is tall, the extra the digit of consumers assisted in the communication the potentiality of congestion ashore the small. WCDMA in this regard has obvious conveniences.

2. duplex mode
WCDMA and CDMA2000 are using FDD (frequency division digital duplex) mode, TD-SCDMA is the color secondhand in TDD (time department 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 band, along to the time to distinguish between up and down the line and switch
TDD spectrum efficiency high and prices cheap, but non-consecutive multi-slot transportation mode, the base station transmitter pinnacle power and mean power percentage higher, resulting in higher power base stations, base station scope radius is small, likewise outcome in anti-fading and anti-poor rendition of Doppler shift, when the mobile appliance when in a state of high-speed mobile communications meager.
WCDMA and CDMA2000 can support mobile devices is about 500 km per hour when in the normal communication,PULSERA TRANSPARENTE CON FRANCIA, and TD-SCDMA mobile extremities can merely support approximately 120 kilometers per hour, on the highway and railway and additional high-speed mobile context at a drawback in the TD-SCDMA .

other related technologies such as the antenna. . . Handoff technology, time later time to jot. . . Hey ~~~~
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