TelecomStudy18

1       Larger Capacity : let us discuss this issue with the help of Shannon’s Theorem. It states that the channel capacity is related to product of available band width and S/N ratio. C         = W log 2 (1+S/N) Where C         = channel capacity             W        = Band width available             S/N      = Signal to noise ratio. It is clear that even if we improve S/N to a great extent the advantage that we are expected to get in terms of channel capacity will not be proportionally increased. But instead if we increase the bandwidth (W), we can achieve more channel capacity even at a lower S/N. That forms the basis of CDMA approach, wherein increased channel capacity is obtained by increasing both W & S/N. The ...

Walsh Code : In CDMA the traffic channels are separated by uinique “Walsh” code. All such codes are orthogonal to each other. The individual subscriber can start communication using one of these codes. These codes are traffic channel codes and are used for orthogonal spreading of the information in the entire bandwidth. Orthogonality provides nearly perfect isolation between the multiple signals transmitted by the base station. The basic concept behind creation of the code is as follows: (a)        Repeat the function right (b)        Repeat the function below (c)                 Invert function (diagonally) 0  -----  0          0 --------           0          0   ...

The Call Processing Subsystem (CPS) is the hub for the BSS system’s resource management and call signaling protocol processing. The CPS contains only two modules — call processing module (CPM) and power alarm module (PAM). The CPM is connected to a port of the NIM module in the HIRS through an RS422 interface, and communicates with other subsystems in the BSC (including SVBS, BSM and the NCM module of the HIRS) and the BDS subsystem in the BTS via the HIRS. Since the CPS does not contain many boards, it shares the same frame with the CDSU and GPSTM, as sketched in Fig   Call Processing Module (CPM) CPM is short for Call Processing Module. In the BSC of the CDMA WLL system, the CPM is responsible for call management. As the concentration point of SCWLL system management and signaling processing, its main functions are signaling processing of the Abis interface of the whole CDMA WLL system, wireless resource management and assignment, ground link resource manage...

Parameter Name Parameter Description Default Value Cdma2000CellRelationId The value component of the Relative Distinguished Name (RDN). externalCdma2000CellRef Reference to a ExternalCdma2000Cell. includeInSystemInformation Indicates if the CDMA2000 cell referred to is included in System Information. When the includeInSystemInformation is set to false, the CDMA2000 cell is not  included in SIB8. A maximum of 32 CDMA2000 cells can be included in SIB8. true freqCdma Identifies the carrier frequency within a CDMA2000 Band. Cdma2000FreqId The value component of the Relative Distinguished Name (RDN). reservedBy Contains a list of MO instances that reserve this MO instance. Cdma2000FreqBandId The value component of the Relative Distinguished Name (RDN). ...