DIFFERENCE BETWEEN GSM AND CDMA TECHNOLOGIES

communication in gsm

gsm architechure

GSM(GLOBAL SYSTEM FOR MOBILE COMMUNICATION) IS EDGE(ENAHANCED DATA RATES FOR GSM EVOLUTION) ENABLED ,WHILE CDMA ISEVDO ENABLED.

cdma archtechure

DATA RATES

GSM DATA RATES UP TO 384KBPS WITH REAL WORLD SPEED REPORTED CLOSER TO 70-140 KBPS, WHILE DATA RATE OF CDMA IS 2MEGABIT/SEC.

MULTIPLEXING TECHNIQUES USED

TDMA(TIME DIVISION MULTIPLE ACCESS) AND FDMA(FREQUENCY DEVISION MULTIPLE ACCESS) TECH. USED BY GSM,WHICH DIVIDES AVAILABLE BANDWIDTH AMONG THE DIFFERENT CHANNELS.

ON THE OTHER HAND CDMA IS A TYPE OF MULTIPLE ACCESS SCHEME (MEANS ALLOATING GIVEN BANDWIDTH TO MULTIPLE USERS),WHICH INCREASES SIZE OF SPECTRUM.

SECURITY OR VOICE PRIVACY

GSM HAVE NOT ANY ENHANCED VOICE PRIVACY.WHILE IN CDMA,EACH USER IS PROVIDED A UNIQUE CODE AND ALL CONVERSATION BETWEEN TWO USERS ARE CODED OR ENCRYPTED,THIS PROVIDES A GREATER LEVEL OF SECURITY IN CDMA.

HOW GSM BREAKS A 30 AVAILABLE TIME SLICES

IN GSM PHONE,EACH ONE GET 1/30 OF AVAILABLE CHANNELSTHROUGH EACH ONE CAN BE AVAILABLE TO SEND AND RECEIVE DATA.

CDMA PHONE ONLY GET A SLICE OF BANDWIDTH,WHEN THEY ACTUALLY NEED ONE.SO IF YOU ARE NOT TALKING,NOTHING IS TRANSMITTED.

BATTERY CONSUMPTION

MOST CDMA CALLS CAN BE FIT INTO GIVEN AMOUNT OF FREQUENCY SPECTRUM(IT IS MORE EFFICIENT) ,LESS RADIATION IS BEING CREATED FROM THE PHONE TOWARDS THE USER(YOU GET RADIATION WHEN YOU COMMUNICATE),AND THE BATTERY POWER IS CONSERVED SINCE THE HANDSET ONLY TRANSMIT WHEN IT ACTUALLY HAS SOMETHING TO SEND.

METAL RUBBER

AS WE ALL KNOW THAT RUBBER IS A BAD CONDUCTOR OF HEAT OR WE CAN SAY THAT IT WORKS AS AN INSULATOR.BUT BECAUSE OF SOME GENIOUS AROUND US ,THEY MAKE ALL THE ABOVE STATEMENT FALSE.
AS PER NEW DISCOVERIES CHEMIST CREATE SELF ASSEMBLING CONDUCTIVE RUBBER,POLYMER CHEMIST HAVE CREATED A FLEXIBLE,INDESTRUCTIBLE MATERIAL CALLED METAL RUBBER,IT CAN BE HEATED,FROZEN,WASHED WITH JET FUEL,AND STILL RETAIN ITS CONDUCTING PROPERTIES.
HOW TO PREPARE IT?
TO MAKE METAL RUBBER ,ENGINEER & CHEMISTS USE A PROCESS CALLED SELF ASSEMBLY.THE MATERIAL IS REPEATEDLY DIPPED IN SOLUTION OF POSITIVELY AND NEGATIVELY CHARGED IONS.
THE POSITIVE AND NEGATIVELY CHARGED BOND ,FORMING LAYERS THAT CONDUCT ELECTRICITY.BY DIPPING THE BASE MATERIAL INTO BATHS OF ALTERNATING ELECTRONS AND PROTONS,THOSE NANOPARTICLES WITH OPPOSITE CHARGE ATTRACT AND STICK EACH OTHER VERY SMOOTHLY.EACH DIP ADDS ONE LAYER.
ADVANTAGES:
METAL RUBBER IS LOWER IN WEIGHT
LOWER MANUFACTURING COST
FEW BYPRODUCTS ARE ALSO AVAILABLE
CAN BE WASHED WITHOUT ANY ADVERSE AFFECT
POWERFUL
APPLICATIONS:
CLOTHES FOR SOLDERS-AS THEY ARE LIGHTER AND PROTECTIVE BY USIG SENSORS WHICH CAN MONITOR THE BLOOD PRESSURE,BODY TEMPERATURE,AND HEART BEAT.

CAN BE MODIFIED TO WORK AS AN GUARD AGAINST THE BULLETS,CHEMICAL AND BIOLOGICAL WARS.

USED FOR AIRCRAFT WINGS,ARTIFICIAL MUSCLES AND WEARABLE COMPUTERS.

source:newer discoveries book