A transmitted signal changes as it travels to the receiver. The effect of these changes is commonly referred to as fading. The fading results from the
Read More3G is new upgraded cdma technology, in simple word its Wide band Code Devision Multiple Access Technology (WCDMA). This is first technology in which v
Read MoreThe 3rd Generation Partnership Project (3GPP) is a collaboration between groups of telecommunication associations, to make a globally applicable third
Read MoreA data-modulation scheme defines how the data bits are mixed with the carrier signal, which is always a sine wave. There are three basic ways to mo
Read MoreOVSF Code (Orthogonal Variable Spreading Factor) is used as channelization code Orthogonal codes are easily generated by starting with a seed of
Read MoreDownlink Physical Channel of WCDMADownlink Dedicated Physical Channel:Downlink DPCHDownlink Common Physical Channel:Common Control Physical Channel (C
Read MoreA physical channel is defined by a specific carrier frequency, code (scrambling code, spreading code) and relative phase.In UMTS system, the different
Read MoreChannel Bandwidth 5 MHz Duplex Mode FDD and TDD Downlink RF Channel Structure Direct Spread (DS) Chip Rate 3.84 Mcps Frame Len
Read MoreSupport two basic modes: FDD and TDD modes High chip rate (3.84 Mcps) and data rates (up to 2 Mbps) Employs coherent detection on uplink and
Read MoreDifferent modulation methods corresponding to different transmitting abilities in air interface. R99/R4: QPSK HSDPA: QPSK or 16QAM The UTR
Read MoreLogical Channel = information container Defined by is transferred. Transport Channel = characteristics of transmission Described by and with data
Read MorePurpose of WCDMA Channelization Code Channelization code is used to distinguish different physical channels of one transmitter For downlink, c
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