How is gsm different from cdma

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The Larger area is divided into cells , and each cell has a network tower that provides services to all the mobile phone under that cell. Hence, data transfer rate is slower in GSM. In TDMA a multi-user access is provided by slicing the channel into different time slices.

In FDMA multiple user access is made possible by separating the frequencies in the channel. The entire information about the user and the account is stored in the internal memory of the device or handset.

Ther is a physical medium, and each device has been given a specific code. The network stations transmit entire frequencies over all the times. The particular device or handset is identified by the code theory in the network. Thus network accessing and billing are linked with the card itself rather than the handset. It was originally developed by Qualcomm. CDMA system offers complete bandwidth utilization, by offering a unique code to each signal which is to be transmitted over a complete channel bandwidth.

Thus various CDMA signals transmitted through the channel are differentiated by different codes. Therefore, it utilizes the direct sequence spread spectrum modulation with mixed CDMA detection.

Basically, in the CDMA technique, each signal in the channel is provided a separate spreading code. This code helps to distinguish the various signals present in the channel. A group of orthogonal codes is generally used to detect the signal at the receiver. The base station of the CDMA station holds different codes, thus when various signals are received from multiple base stations then the base station distinguishes the signals with the help of spreading codes that are orthogonal in nature.

The use of orthogonal codes minimizes the chances of interference. Thus we can say, in the case of CDMA, each frequency is used by all the users in the network but each holds a different code. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.