Wcdma Basic

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wcdma principles

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Basic Parameter of WCDMABasic Parameters of WCDMAFrequency Band : 2100 MHz 1920-1980MHz (UL) &2110-2170 MHz (DL)Duplex Space : 190 MHzChannel bandwidth : 5 MHzCoding Spacing : 200 KHz (RASTER)UARFCN Range : 10562-10838 (Total ARFCN 276)Duplex mode : FDD and TDDDownlink RF channel structure : Direct spreadChip rate& Chips : 3.84 Mcps& It is pulse of spreading spectrum n Its in rectangular shape of +1 & -1Frame length : 10 ms (38400 chips) = 15Slots, & 1slot = 2650chipsSuperframe : A Superframe has a duration of 720ms and consists Of 72 radio frames. The super frame boundaries areDefined by the System Frame Number (SFN)Spreading modulation : Balanced QPSK (downlink)Dual-channel QPSK (uplink)Complex spreading circuitData modulation : QPSK (downlink) & BPSK (uplink)Channel coding : Convolution (Voice) and turbo (data) codesCoherent detection : User dedicated time multiplexed pilot (DL and UL), Common pilot in the downlinkChannel multiplexing in downlink : Data and control channels time multiplexedChannel multiplexing in uplink : Control and pilot channel time multiplexedI&Q multiplexing for data and control channelSpreading factors : 4256 (uplink), 4512 (uplink)Power control : Open and fast closed loop (1.6 kHz)Power control period : 1500HzPower control step size : 0.5, 1, 1.5 and 2dbPower control rangeHandover : Soft HO, softer HO, Inter frequency and IRAT HO