| We consider very general code-division-multiple-access (CDMA) systems, namely multiple-chip-rate
CDMA systems, where signals can be transmitted at different chip rates, carrier frequencies,
processing gains, and transmitted powers to satisfy the given quality of service (QoS) requirements. Also, non-zero and possibly different carrier frequency offsets are assumed for different users. For these systems, a closed-form bit error rate (BER) expression is derived based on the simplied improved Gaussian approximation. Unlike the conventional simplied improved Gaussian approximation, however,
we utilize the correlations between chip waveforms and their integrations rather than using the correlations between chip sequences in order to obtain the closed-form BER expression. Numerical results demonstrate that the proposed method provides much more accurate BER values compared to the standard Gaussian approximation. |
| Mr. Ju received the B.S. degree in Electrical Engineering from Pohang University of Science and Technology, Pohang, Korea, in 1997 and the M.S. degree in Electrical Engineering from Korea Advanced Institute of Science and Technology (KAIST), Taejon, Korea, in 1999. He is now a Ph.D. student at Queen's University, ON, Canada.
From 1999 to 2005, he was a researcher at Korea Electronics Technology Institute (KETI), Korea. During this period, he was involved in many projects related with WPAN systems such as Bluetooth, IEEE802.15.3, IEEE802.11, and HomeRF.
His research interests are in the areas of MIMO communications, cooperative diversity, and synchronization in communication.
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