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
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3G is new upgraded cdma technology, in simple word its Wide band Code Devision Multiple Access Technology (WCDMA). This is first technology in which v
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The 3rd Generation Partnership Project (3GPP) is a collaboration between groups of telecommunication associations, to make a globally applicable third
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A 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
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OVSF Code (Orthogonal Variable Spreading Factor) is used as channelization code Orthogonal codes are easily generated by starting with a seed of
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Downlink Physical Channel of WCDMADownlink Dedicated Physical Channel:Downlink DPCHDownlink Common Physical Channel:Common Control Physical Channel (C
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A physical channel is defined by a specific carrier frequency, code (scrambling code, spreading code) and relative phase.In UMTS system, the different
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Channel Bandwidth 5 MHz Duplex Mode FDD and TDD Downlink RF Channel Structure Direct Spread (DS) Chip Rate 3.84 Mcps Frame Len
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Support 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
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Different modulation methods corresponding to different transmitting abilities in air interface. R99/R4: QPSK HSDPA: QPSK or 16QAM The UTR
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Logical Channel = information container Defined by is transferred. Transport Channel = characteristics of transmission Described by and with data
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Purpose of WCDMA Channelization Code Channelization code is used to distinguish different physical channels of one transmitter For downlink, c
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