BLOCK DIAGRAM OF IS 95 FORWARD LINK
With a neat diagram, explain forward CDMA channel.
RS1 is mandatory for IS-95. But support for RS2 is optional. It also carries power control bits for the reverse channel. The forward channel modulation process is as follows: A. Convolution encoder and repetition: Speech coded voice or user data is encoded using ½ rate convolution encoder with constraint length 9.
IS-95 Cdma - SlideShare
Mar 29, 2015IS-95 Cdma. -Achieving flexibility due to the bandwidth on demand. • Power Control -Reducing the interference and increasing the talk time of mobile station by using the efficient power control scheme. • Soft handoffs -Contributing to the achievement of the diversity and reduce the chance of loss of link midway through the conversation.[PDF]
IS-95 CDMA - University of Pittsburgh
Provides security by scrambling the input data with a long code mask permuted with the user’s ESN. Provides a very fast power control subchannel(800 times a second). The input data is punctured 800 times a second and a power up command is sentto the mobile station.
With the help of a neat block diagram, explain the working
Question: With the help of a neat block diagram, explain the working of reverse CDMA IS 95 modulation process for a single user.[PDF]
Mobile communications: IS-95 and GSM
The IS-95 system can be thought of as having many layers of protection against interference. It allows many users to co-exist, with minimal mutual interference. They can be described by the signal conditioning sequence that occurs on forward and reverse channels (Figure 1 and Figure 2, [PDF]
Wireless Location in IS–95 CDMA Cellular Radio Systems
metres (67%) and 150 metres (95%) for handset-based solutions. For network-based solutions the required position accuracy is 100 metres (67%) and 300 metres (95%). The applications of wireless
7 CDMA - University of Colorado Boulder
Figure 7: EVDO forward-link compared to cdmaOne forward-link: the EVDO forward link transmit the entire sector power and all its orthogonal channels for pilot, control channels, or actual user data channels, during a given time slot. IS-95 on the other hand transmits pilot, paging, synch, and user data simultaneously, over different orthogonal channels.
3SL Reference: SysML Block Definition Diagram (bdd
Block Definition Diagram (bdd) The Block Definition Diagram (bdd) is used to define each Block's characteristics in terms of it's structural and behavioural features, and relationships between the Blocks such as hierarchical relationships.[PDF]
SysML Modelling Language explained - Systems Modeling
Instantiating blocks on sequence diagrams establish a link with the static system model, contributing towards the model consistency: A lifetime’s Block can be accessed in the model repository (EA), to open its properties, BDD and any IBD Each message that is exchanged on the sequence diagram can be used to identify new block operations
Block diagram - Wikipedia
A block diagram is a diagram of a system in which the principal parts or functions are represented by blocks connected by lines that show the relationships of the blocks. They are heavily used in engineering in hardware design , electronic design , software design , and process flow diagrams .