The Implementation of A High Speed

Experimental Transceiver Module with an

Emphasis on CDMA Applications

Arya Reza Behzad, M.S.1995

(co-advisors: Robert Brodersen, Paul Gray, Robert Meyer)

In order to satisfy the front-end requirements for the baseband Infopad system, three alter-natives methods have been investigated. First, as a short-term solution, a commercial radio modem was utilized. The use of a commercial modem, however, restricted the base-band system in many ways. The data rate was not high enough, multiple access could not be easily achieved, and the commercial modem did not allow for much flexibility in testing various scenarios and empirically investigating various issues. As an intermediate solution to these problems, the front-end system presented here was designed and implemented, reducing or eliminating the restrictions outlined above. Some restrictions do still exist which will be eliminated in the final solution to the front-end requirements of the Infopad system. For example, a rake receiver cannot be implemented using this module, but such a receiver will be implemented in the final version of Infopad. Furthermore, the power consumption, component count and cost of this module is relatively high. These issues are also addressed in the final, fully integrated, version of Info-pad [1]. Section 1.0, "An overview of the Infopad Project," discusses a summary of the communication system issues relating to the Infopad. Much of the work in this section has been performed by Sam Sheng, Craig Teuscher and Professor Bob Brodersen. The report continues on to discuss the many issues that had to be considered in the design of this module. In general, in every section, the related background theory is presented and then the specifics of the issues as related to this system are outlined. In some sections, the specifics of the issues are not presented separately as the background theory section applies directly.