For the first time, a Code Division Multiple Access (CDMA) used in World War II by Allied forces to thwart the efforts of Nazi Germany in the interception of their information through "messaging stir.
The information sent and received is usually in digital form. The digital data is then transmitted as a radio signal over a wireless network, using a unique code to distinguish each call. Thus, CDMA technology allows more persons share waves simultaneously without interference signals in the air.
CDMA uses the concept of multipath fading, namely: robustness against signal reflections that buildings, CDMA is capable of receiving and combining the signals better. There are two types of mobile phones that support the use of CDMA technology, namely:
aircraft types that are classified as mobile phones, with the size and functions such as cell phones, in general, and ...
types of aircraft such as fixed wireless terminal, which resembles a traditional regular phone, but without wires.
A disadvantage of CDMA systems are limited in scope because, using a frequency of 1900 KHz. In contrast to the use of frequencies of GSM 900 - 1800 MHz, ie the higher the frequency, the shorter the distance that can be covered by a Base Transceiver Station (BTS).
Since 2007 Indonesia has set the standard for the frequency to 800 Mhz CDMA system. Cellular operators in Indonesia, which dominates the use of CDMA technology are: Telkom (Flexi), Bakrie Telecom (EIS), Mobile-8 (Fren) and Smart.
Mobile phones now used to make and receive phone calls. Furthermore, for sending and receiving short messages or SMS (Short Message Service). For mobile middle class and upper class, usually account to share / send photos / images using MMS (Multimedia Message Service), Internet browsing with WAP (Wireless Application Protocol) and GPRS (General Packet Radio ), there can even watch TV on mobile phone calls and video thanks to the 3G (third generation). With the features of 3G, communication and how to get the information faster, clearer sound, became an instant exchange of data, and many other amenities are available.
The information sent and received is usually in digital form. The digital data is then transmitted as a radio signal over a wireless network, using a unique code to distinguish each call. Thus, CDMA technology allows more persons share waves simultaneously without interference signals in the air.
CDMA uses the concept of multipath fading, namely: robustness against signal reflections that buildings, CDMA is capable of receiving and combining the signals better. There are two types of mobile phones that support the use of CDMA technology, namely:
aircraft types that are classified as mobile phones, with the size and functions such as cell phones, in general, and ...
types of aircraft such as fixed wireless terminal, which resembles a traditional regular phone, but without wires.
A disadvantage of CDMA systems are limited in scope because, using a frequency of 1900 KHz. In contrast to the use of frequencies of GSM 900 - 1800 MHz, ie the higher the frequency, the shorter the distance that can be covered by a Base Transceiver Station (BTS).
Since 2007 Indonesia has set the standard for the frequency to 800 Mhz CDMA system. Cellular operators in Indonesia, which dominates the use of CDMA technology are: Telkom (Flexi), Bakrie Telecom (EIS), Mobile-8 (Fren) and Smart.
Mobile phones now used to make and receive phone calls. Furthermore, for sending and receiving short messages or SMS (Short Message Service). For mobile middle class and upper class, usually account to share / send photos / images using MMS (Multimedia Message Service), Internet browsing with WAP (Wireless Application Protocol) and GPRS (General Packet Radio ), there can even watch TV on mobile phone calls and video thanks to the 3G (third generation). With the features of 3G, communication and how to get the information faster, clearer sound, became an instant exchange of data, and many other amenities are available.
