Infrared communication (IR) is a wireless mobile technology used for device communication over short ranges. Unguided infrared and millimeter waves are widely used for short-range communication.
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Modes of Mobile communication
Here we will discuss different Modes are used to provide communication for the mobile / wireless medias. Different modes used for wireless communication. IR – Infrared wireless communication Broadcast Radio communication Microwave communication Satellite communication
Read MoreCDMA vs GSM
Here are the mentioned least seven different functions where CDMA is different from GSM. Functions GSM CDMA(IS-95) Frequency 900MHz; 1800MHz;1900MHz 800MHz;1900MHz Channel Bandwidth Total 25 MHz bandwidth with 200 KHz per channels, 8 timeslots per channel with frequency hopping. Total 12MHz with 1.25 MHz for the spread spectrum. Voice Codec 13Kbits/second 8Kbits/second or 13Kbps Data bit rate 9.6 Kbits/second or expandable 9.6Kbits SMS 160 characters of text supports 120 characters SIM Card Yes No Multipath Causes interference and destruction to service Used as an advantage Radio Interface TDMA CDMA Handoff…
Read MoreCDMA in Mobile Communication
What is CDMA ? The term “CDMA” (Code Division Multiple Access) refers to both a spread spectrum technique and a cellular standards. Initially it was restricted to the armed forces, this technology was commercially launched in 1995. How it Works? Code: It refers to the string of binary sequence that the transmitter and the receiver share. This code encodes the information into a low frequency signal before it is transmitted over a channel. This same code is used by the receiver to decode the information. The receiver gets the code…
Read MoreGSM Services
GSM is the most successful digital mobile telecommunication system in the world today. It is used in more than 190 countries. GSM permits the integration of different voice and data services and the inter working with existing networks. Services make a network interesting for customers. GSM has defined three different categories of services: Telephony (also referred as tele-services) Services Data (also referred as bearer services) Services Supplementary Services 1. Tele-Services or Telephony Services : GSM mainly focuses on voice-oriented Teleservices. These comprise encrypted voice transmission, message services, and basic data…
Read MoreGSM-Mobile Communication
What is GSM? GSM is the most popular standard for mobile phones in the world. GSM (Global System for Mobile communication) is a digital mobile telephony system. The first GSM network was launched in 1991 and it is the most successful digital mobile telecommunication system that is widely used in India and other parts of the world. How GSM is working? GSM uses a combination of FDMA and TDMA. The GSM system has an allocation of 50 MHz bandwidth in the 900 MHz frequency band. Using FDMA, this band is…
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