Customer base to tremendous numbers due to the

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customer base to tremendous numbers due to the services now available with the implemented 3G mobile broadband technologies. The following figure displays the evolution of CDMA2000 throughout the years. [1]
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Figure 1: CDMA2000 Roadmap with Complimentary Mobile Broadcast and Broadband Solutions Another mobile broadband solution is the use of Orthogonal Frequency Division Multiplexing (OFDM). In the past few recent years, OFDM has been used as the standard for many wideband wireless systems such ADSL, Wi-Fi, WiMAX and IEEE802.20. This is due to the fact that OFDM ensures “near-orthogonality” among users residing in the same cell for both up and down links. Other benefits of using OFDM as a mobile broadband system include the possibility to assign different tones to each user, transmit power control, etc… Many believe that OFDM will become the basis for future fourth- generation (4G) cellular telephony, due to its alleged simplicity over CDMA. [2] Even after understanding both technologies, telecommunication industries are still trying to figure out which one to go for. The basis for making a decision on which technology to pick depends on the complexity of the system related to it, its performance and, of course, the ability to provide the services that customers require. [1] This report will describe both mobile broadband technologies and present a comparison in terms of performance and performance of implementing these two technologies.
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Code-Division Multiplexing Access (CDMA) CDMA is a form of multiplexing which allows for the simultaneous occupation of a single transmission channel by several signals, which optimizes the use of the available bandwidth. This is possible by assigning every user utilizing that same transmission channel with a pseudo-random code. This locally-generated code is then XORed with the data signal and sent over the channel. Since every user has their own pseudo-random code, their signal is modulated differently and can be uniquely identified. CDMA is believed to be advantageous over other techniques because it allows for efficient utilization of the fixed frequency spectrum and flexibility in the allocation of resources. [2] Orthogonal Frequency Division Multiplexing (OFDM) OFDM is technique that divides available frequency into many carriers. In order to send data over these carriers, the carriers are modulated by a low rate data stream with sidebands on either side of each OFDM symbol. These carriers are spaced close to each other making this multicarrier transmission technique very efficient, and is achieved by making all the carriers orthogonal to one another. This orthogonality is used to avoid the interference that may occur between neighbouring carriers.
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