Basic Parameter of WCDMA

Basic Parameters of WCDMA

Frequency Band                                    :           2100 MHz

                                                                        1920-1980MHz (UL) &2110-2170 MHz (DL)

Duplex Space                                       :           190 MHz

Channel bandwidth                               :           5 MHz

Coding Spacing                                    :           200 KHz (RASTER)

UARFCN Range                                     :           10562-10838 (Total ARFCN – 276)

Duplex mode                                        :           FDD and TDD

Downlink RF channel structure               :           Direct spread

Chip rate& Chips                                   :           3.84 Mcps& It is pulse of spreading spectrum n 

                                                                        It’s in rectangular shape of +1 & -1

Frame length                                         :           10 ms (38400 chips) = 15Slots, & 1slot = 2650chips

Superframe                                          :           A Superframe has a duration of 720ms and consists

                                                                        Of 72 radio frames. The super frame boundaries are

Defined by the System Frame Number (SFN)

Spreading modulation                             :           Balanced QPSK (downlink)

Dual-channel QPSK (uplink)

Complex spreading circuit

Data modulation                                     :          QPSK (downlink) & BPSK (uplink)

Channel coding                                      :           Convolution (Voice) and turbo (data) codes

Coherent detection                                 :           User dedicated time multiplexed pilot (DL and UL), 

Common pilot in the downlink

Channel multiplexing in downlink            :           Data and control channels time multiplexed

Channel multiplexing in uplink                :           Control and pilot channel time multiplexed

I&Q multiplexing for data and control channel

Spreading factors                                   :           4–256 (uplink), 4–512 (uplink)

Power control                                        :           Open and fast closed loop (1.6 kHz)

Power control period                              :           1500Hz

Power control step size                           :           0.5, 1, 1.5 and 2db

Power control range

Handover                                              :           Soft HO, softer HO, Inter frequency and IRAT HO