Graduate Thesis Or Dissertation
 

OCC-CDMA system design for wireless communications

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  • In modern telecommunication applications, the need for high-reliability and high data rate is important because of factors such as a higher demand in multimedia capability of mobile devices and the exponentially increasing number of subscribers. Wireless communications in today’s technology have many limitations due to channel imperfections, which result in less than satisfactory speed of transmission and less reliability. Moreover, bandwidth, one of the most the precious resources of all communication schemes, has been reaching the limit established either by the spectrum governing bodies such as the FCC in the U.S. or by technological shortcomings. This means that increasing the number of users is extremely difficult. Researchers have been inventing and developing many techniques to overcome such limitations. Good examples are real-time channel estimation and compensation, new modulation techniques, efficient coding algorithms and novel multiple-access techniques. This thesis presents a new CDMA modem (modulator-demodulator) which achieves a higher bandwidth efficiency in a multiple user scenario than conventional CDMA-based systems and attains low BER performance through the application of orthogonal-complementary coded CDMA (OCC-CDMA) and non-conventional QAM. The OCC-CDMA itself has the advantages of less multiple access interference (MAI) and capability of transmitting the maximum of 1 bit per spreading chip, which is impossible to achieve with conventional CDMA. By utilizing such unique properties of OCC-CDMA, high information transmission rates with acceptable BER performance can be achieved.
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