Difference between WIFI and 3G

Difference between WIFI and 3G

differentiation between gsm and cdma

differentiation between gsm and cdma

Disadvantages of CDMA

One major problem in CDMA technology is channel pollution, where signals from too many cell sites are present in the subscriber’s phone but none of them is dominant. When this situation arises the quality of the audio degrades. Another disadvantage in this technology when compared to GSM is the lack of international roaming capabilities. The ability to upgrade or change to another handset is not easy with this technology because the network service information for the phone is put in the actual phone unlike GSM which uses SIM card for this. One another disadvantage is the limited variety of the handset, because at present the major mobile companies use GSM technology

Advantages of CDMA

One of the main advantages of CDMA is that dropouts occur only when the phone is at least twice as far from the base station. Thus it is used in the rural areas where GSM cannot cover. Another advantage is its capacity; it has a very high spectral capacity that it can accommodate more users per MHz of bandwidth. It uses a vocoder EVRC for noise reduction where the background noise is reduced. This is exclusively available in CDMA technology only