WiMax (Wireless Interoperability for microwave access) is a wireless digital communication system based on IEEE 802.16 standards. It can be used for transmitting data from a fixed station as well as a mobile station. It can provide wireless access upto 50 km for fixed stations and 15 km for the mobile ones.
Among the main uses of WiMax comes the internet connectivity for laptops. In a radius of upto 10 km WiMax can give access rates of upto 40Mbps per channel. In India(a south asian fast developing economy), WiMax network is being setup in Chennai, a city in south of India. This technology if spreads out to the entire country can benefit the 1 billion citizens of India, especially the villages of India where still for many using internet remains a dream.
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Thursday, October 4, 2007
Monday, October 1, 2007
CDMA or GSM
In the present day scenario the GSM (Global System for mobile communication) is dominating in most parts of the world, but rapidly the CDMA (Code Division Multiple Access) is taking over it because of the additional advantages it provides.
In CDMA there is no division of frequency band unlike GSM which assigns a specific frequency to each user. Each user in GSM is identified using the SIM(Subscriber Identity module) card which stores the service subscriber key used to identify the user.
On the left is shown a CDMA phone by Tata Indicom.
CDMA employs spread spectrum technology in which the energy generated in a particular bandwidth is spread in the frequency band. This frequency band is used for all the users. It provides better bandwidth for the voice and data transmission over the network and hence increases the number of people that can be connected at any given time. This means using it you will hear less of those irritating("Network is currently busy") messages. Surely CDMA provides high speed services.
But inspite of all these benefits of CDMA we cannot forget the advantage given to SIM card owners to easily change their mobile phones.
In CDMA there is no division of frequency band unlike GSM which assigns a specific frequency to each user. Each user in GSM is identified using the SIM(Subscriber Identity module) card which stores the service subscriber key used to identify the user.
On the left is shown a CDMA phone by Tata Indicom.
CDMA employs spread spectrum technology in which the energy generated in a particular bandwidth is spread in the frequency band. This frequency band is used for all the users. It provides better bandwidth for the voice and data transmission over the network and hence increases the number of people that can be connected at any given time. This means using it you will hear less of those irritating("Network is currently busy") messages. Surely CDMA provides high speed services.
But inspite of all these benefits of CDMA we cannot forget the advantage given to SIM card owners to easily change their mobile phones.
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