ABSTRACT
In today’s world of technology it’s really excitingand enthusiastic to know thata frequency band of 800MHz or 1900 MHz is used for mobile
communication.Technologies that we are using for mobile communication
are known as cellular access technologies – GSM, FDMA,TDMA and CDMA.
FDMA is the technology that separates this spectrum into distinct voice
channels by splitting it into uniform chunks of bandwidth. It’s not an efficient
technology for digital transmission. In TDMA, a narrow band that is 30 KHz
wide and 6.7 milliseconds long is split time wise into three time slots. Each
conversation gets radio for one third of the time. In this case voice data has
been converted to digital information so that the transmission space is reduced
CDMA, after digitizing the data spreads it out over the entire available
bandwidth. Multiple calls are over laid on each other on the channel with each
assigned a unique sequence code.Continuousdevelopment of mobile
communication has led to the evolution of the Bluetooth, GPRS, Wi-Fi for
providing the internet facility. In conclusion one can easily say that CDMA
combined with Bluetooth and GPRS is the best and the latest technology that
we are using for mobile communication.
Click Here To Download
Posts
0 comments:
Post a Comment