What are the channel used in IS-95?
Forward Channel: The IS-95 forward Channel structure consists of four types of logical Channels – pilot Channel, synchronization Channel, paging Channel, and forward traffic Channels.
IS-95 a bandwidth?
IS95 specification summary
IS95 (cdmaOne) Highlight Specifications SUmmary | |
---|---|
Parameter | Details |
Multiple Access Scheme | CDMA |
Channel bandwidth | 1.25 MHz |
Data rate | 14.4 kbps – IS-95A 115 kbps – IS-95B |
IS-95 CDMA forward channel and reverse channel PPT?
IS-95 CDMA Forward Channel The forward link uses the same frequency spectrum as AMPS (824-849 Mhz) Each carrier 1.25MHz 4 types of logical channel: A pilot, a synchronization, 7 paging, and 55 traffic channels Channels are separated using different spreading codes QPSK is the modulation scheme Orthogonal Walsh codes …
IS-95 in wireless communication?
Interim Standard 95 (IS-95) is a second generation (2G) mobile telecommunications standard based on code division multiple access (CDMA) technology, which guarantees multiple access when sending voice and data between mobile phones and cell sites. IS-95 operates in the 800 MHz and 1900 MHz frequency bands.
What is a reverse channel?
Dictionary of Business Terms for: reverse channels. reverse channels. marketing channel of distribution where products are moved from the consumer back to the producer. The two most frequent examples of this are recycling and product recalls.
IS-95 mobile station transmitter?
The IS-95 forward link uses a form of modulation known as Quadrature Phase Shift Keying (QPSK). This allows two bits per symbol to be transmitted and is therefore an efficient method of transmitting the data. The IS-95 forward link consists of a number of elements.
What is the spread spectrum?
Definition(s): Telecommunications techniques in which a signal is transmitted in a bandwidth considerably greater than the frequency content of the original information. Frequency hopping, direct sequence spreading, time scrambling, and combinations of these techniques are forms of spread spectrum.
IS-95 a standard CDMA?
Interim Standard 95 (IS-95) was the first ever CDMA-based digital cellular technology. It was developed by Qualcomm and later adopted as a standard by the Telecommunications Industry Association in TIA/EIA/IS-95 release published in 1995. CDMA permits several radios to share the same frequencies.
IS-95 CDMA digital cellular system?
IS-95 stands for Interim Standard 95 and is also known as CDMAOne. It was the first ever CDMA-based digital cellular technology and was developed by Qualcomm. It is an 2G cellular system based on DS-CDMA. To understand IS-95 we need to understand DS and CDMA separately.
IS-95 a frequency band?
RF modulation The baseband quadrature data are raised to the forward cellular radio band, 869 to 894 MHz. The IS-95 channel occupies 1.25 MHz within this band, the rest of which is occupied by other cellular services such as AMPS. Several low numbered channels are assigned to paging.
What is the disadvantage of guard channel?
Here, a fraction of the total available channels in a cell is reserved exclusively for handoff requests from ongoing calls. This method has the disadvantage of reducing the total carried traffic, as fewer channels are allocated to originating calls.