Here You Get how 3G work, Go inside WCDMA Technology and wcdma rf optimization.
Main work of SCCPCH Secondary Common Control Physical Channel for wcdma is as below. Carrying FACH and PCH, SF = 256 – 4 Pilot: used for demodulation TFCI: Transport Format Control Indication, used for describe data Format The Secondary Common Control Physical Channel (S-CCPCH) is used to carry the FACH and PCH transport channels. … Read more
Paging Indicator Channel PICH main work in 3G as below. Carrying Paging Indicators (PI) Fixed rate (30kbps), SF = 256 N paging indicators {PI0, …, PIN-1} in each PICH frame, N=18, 36, 72, or 144 The Page Indicator Channel (PICH) is a fixed rate (30kbps, SF=256) physical channel used by the NodeB to inform a … Read more
Main work of Primary Common Control Physical Channel PCCPCH in 3G wcdma as below. Carrying BCH transport channel Fixed rate, fixed OVSF code (30kbps，Cch, 256, 1) The PCCPCH is not transmitted during the first 256 chips of each time slot The Primary Common Control Physical Channel (P-CCPCH) is a fixed rate (SF=256) downlink physical channel … Read more
Main Work of Primary Common Pilot Channel (PCPICH) in WCDMA is as below. Carrying pre-defined sequence Fixed channel code: Cch, 256, 0, Fixed rate 30Kbps Scrambled by the primary scrambling code Broadcast over the entire cell A phase reference for SCH, Primary CCPCH, AICH, PICH and downlink DPCH, Only one PCPICH per cell The Common … Read more
The S-SCH also consists of a code, the Secondary Synchronization Code (SSC) that indicates which of the 64 scrambling code groups the cell’s downlink scrambling code belongs to. 16 different SSCs are defined. Each SSC is a 256 chip long sequence. There is one specific SSC transmitted in each time slot, giving us a sequence … Read more
Work of Synchronization Channels P-SCH & SSCH in 3G WCDMA Synchronization Channel mainly Used for cell search its having Two sub channels: P-SCH and S-SCH, SCH is transmitted at the first 256 chips of every time slot. Primary synchronization code is transmitted repeatedly in each time slot. Secondary synchronization code specifies the scrambling code groups … Read more
Passive Distributed Antenna Systems in 3G Various internal antenna solution can meet the different needs of the deployment. DAS solution distributes a plurality of antenna nodes throughout the coverage area. Each antenna assembly can transmit and receive signals 3G. The uplink signals from all the antenna units are collected in a central point, the point … Read more
Active Distributed Antenna Systems inside 3G A DAS contains the same active components present in a DAS passive, with the addition of active devices such as amplifiers, repeaters or amplifiers bidirectional (BDAS) to amplify and / or radio signals shipping. This enables an active DAS to cover a much larger area of a passive DAS. … Read more
Indoor Link Budget for 3G The table shows representative Link Downlink budget for 3G. Fluctuations in the signal can be represented by a scale and small effects such models are typically used for external circulation. Indoor shadowing results in a large-scale signal change, which may be represented by a log-normal distribution in a manner similar … Read more
How to Define on the Basis of Pilot Power Microcell or Repeater In particular, for application indoors, it is often desirable to predict the service area of a repeater or microelement based power CPICH. In the repeater installation and commissioning, CPICH power can be determined by measuring the output (or input) Ec / No and … Read more