Hardware and Sorftware: Major Techniques that Allocate Capacity for Wirless WAN Communications

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Introduction
There are four major techniques that allocate capacity for wireless WAN communications. These techniques are Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Code Division Multiple Access (CDMA), and Orthogonal Frequency Division Multiplexing (OFDM). (Goleniewski, L. 2007) Each technique has pros and cons when compared amongst each other. The following is a summary of why each technique has a need, and some of the challenges that come with that technique.
Radio Frequency
Radio Frequency or RF is used in our everyday lives whether or not you realize it. Some of the common uses of Radio Frequencies are:
• AM radio - 535 kilohertz to 1.7 megahertz
• FM radio - 88 megahertz to 108 megahertz
• Short wave radio - 5.9 megahertz to 26.1 megahertz
• Citizens band (CB) radio - 26.96 megahertz to 27.41 megahertz
• Television stations - 54 to 88 megahertz for channel 2 through 6
• Television stations - 174 megahertz to 220 megahertz for channel 7 through 13
AM is very susceptible to distortion and interference from everything around the signal. FM radio provides a better signal to transmit across due to the signal strength being higher then AM. The higher the signal strength the more reliable the signal is. As a frequency gets higher in the range the tighter the wave forms get and the fewer things can interfere with the wave form.

RF allows us to setup wireless networks for communication over the internet. The standard wireless networks…