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. smartsanmiguel We would like to show you a description here but the site won’t allow us. IS 95 CDMA University of Pittsburgh IS 95 CDMA Radio Aspects • IS 95 is an air interface standard only • System use FDD FDMA CDMA • FDD => Uplink and Downlink channels separated according to Cellular band or PCS band regulatory requirements • FDMA – breaks up licensed spectrum into 1.25 MHz channels • CDMA – multiple users share a 1.25 MHz channel by The IS95 Reverse Channel Wireless munication The IS95 Reverse Channel In the IS95 cellular CDMA system, the Reverse (uplink) Channel (mobile to base station) contains Access Channels and Reverse Traffic Channels. The Reverse Traffic Channel carries (or other user data) and network signaling data from mobile to the base station, while the Access Channel is used by the mobile to request the base station to set up a call and to respond to Paging Channel messages (call set up by the base stations). IS 95 Cdma SlideShare IS 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. Mobile communications: IS 95 and GSM The forward channels are between 869 and 894 MHz, while the reverse channels are between 824 and 849 Mhz. Within these bands, four sub bands are available for CDMA, of widths 1, 0.1, 9 and 10 MHz; in the U.S., 1.25 MHz sub bands near 849 and 894 MHz are employed. Wireless Location in IS–95 CDMA Cellular Radio Systems The block diagram of the developed IS 95 CDMA RF front end receiver is shown in Figure 2. As shown in the diagram, the developed receiver consists of five identical channels which down convert the ... Satellite munication Block Diagram, Earth Station ... Block Diagram of Satellite munication System. The above frequencies are used for T N from the satellite to the earth station , the uplink frequencies are converted to lower frequencies by the mixer and local Osc, the com satellite acts as a repeater station it receives the signal, amplifiers it and then transmitted over a next frequencies... With a neat block diagram, explain reverse CDMA channel. Bandwidth of each channel is 1.25 MHz. The reverse link is separated from forward link by 45 MHz. There is no spreading of the data symbols using orthogonal codes instead orthogonal codes are used for waveform encoding. Spreading is carried out by 42 bit long PN codes. 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. Block Diagram Learn about Block Diagrams, See Examples With SmartDraw, You Can Create More than 70 Different Types of Diagrams, Charts, and Visuals. A block diagram is a specialized, high level flowchart used in engineering. It is used to design new systems or to describe and improve existing ones. Its structure provides a high level overview of major ... Control chap3 SlideShare Control chap3. Block diagram Block diagram reduction by moving blocks Example: Reduce the system shown to a single transfer function. Block diagram Solution: First, move G2 (s) to the left past the pickoff point to create parallel subsystems, and reduce the feedback system consisting of G3 (s) and H3 (s).

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