Investigation of Code Division Multiplexing Access (CDMA) and wireless communications.

Wireless Technology

Question 1:

How wireless communication is implemented

Wireless communication is implemented through the use of different components. A grid which divides regions into smaller cells is utilized in wireless communication. Each of the cells is assigned a radio frequency that provides service to the specific area. The frequencies in the nearby cells can be reused in order to ensure that a high number of people can utilize it. Each of the cells has a base station that consists of a wireless antenna. The wireless antenna plays an essential role in linking the callers to the local network, internet and any other wireless network available (Pahlavan, 2011). The wireless antenna plays an important role in terms of transmitting the signals. In most cases, the wireless antenna can be located in high points which include tall buildings. The transmission of the wireless signal is similar to the transmission of the signals by the radio stations.

Question 2:

The technical details of Frequency Division multiple Access (FDMA) and TDMA

FDMA refers to a technology which separates the total bandwidth available in a system into various frequencies. Overlapping is carried out between frequencies assigned to each of the communication pair
(Gohil, et al, 2013). In most cases, FMDA is used for analog transmission as it is not efficient in terms of digital transmission. A satellite is available in FDMA which is shared by all the users. However, each of the users transmits at a single frequency. The technical operations of a FDMA are similar to that of a FM radio. FDMA operates through the use of unique frequencies within available bands. FDMA mainly utilizes a voice oriented analog technology from the 1G generation.

Time Division Multiple Access (TDMA) plays an important role in the division of bandwidth according to the time. This is unlike FDMA which carries out the division according to frequencies. TDMA utilizes the voice oriented digital technology from 2G generation. It has the ability of carrying three calls at the same time. This therefore eliminates the need for separating the frequencies. Digitization is usually carried out before the combining the conversations into unified digital streams (Gohil, et al, 2013). Three calls can be put into a single frequency before time is assigned to each. The technology therefore plays an essential role in ensuring that a variety of users can use one frequency at the same time. It therefore plays an important role in ensuring that it can be used for multiple calls.

Question 3:

How CDMA, also termed “cellular technology”, works

Code Division Multiple Access (CDMA) is from the 3G and 4G generation and it utilizes the high speed voice oriented integrated with data services. The 4G is IP based and it utilizes voice, data and multimedia services. It works by separating the calls from the assigned code and each bit of conversation is marked using a distinctive code (Gohil, et al, 2013). In case the system gets a call, it assigns a unique code to the particular conversation. The data is divided into small pieces and sent over a number of discrete frequencies. The frequencies are usually available for use at any time and hence its ability to handle a high amount of data. Finally the system reassembles the conversation from the coded bits.

Bibliography

Pahlavan, K., 2011. Principles of wireless networks: A unified Approach, John Wiley & Sons, London.

Gohil, A. et al., 2013. 5G Technology of mobile communication: A survey. Intelligent systems and signal Processing 2013 international conference.