|Title:||Adaptive multiuser interference cancellation|
|Subject:||Code division multiple access|
Wireless communication systems
Hong Kong Polytechnic University -- Dissertations
Department of Electronic and Information Engineering
|Pages:||vii, 76 leaves : ill. ; 31 cm|
|Abstract:||CDMA technology is playing a very important role in modem cellular systems. However, problems with conventional CDMA receivers are significant -multiuser interference rejection depends on the choice of spreading codes which may not be orthogonal, near - far problem and power control (power control is difficult to implement because of stringent requirements). The difficulty arises because of the measure of channel delay spread and long observation time needed to learn about interference and reject it need to be done in a very short time. Near-Far Effect is currently considered to be the significant cause performance degradation of both synchronous and asynchronous code division multiple access (CDMA) system because the conventional single-user detection in a multiuser channel is not near-far resistant. Architectures for multiuser detection, proposed by VerdU are considered to be well suited in solving the problems of the conventional receivers.In these receivers, mutual independence but not orthogonality of the spreading codes is a basic requirement, these receivers are near-far resistant and have higher user capacity (asymptotic efficiency ). This project develops a software simulation package to study the near-far resistant property of the decorrelator type of asynchronous multiuser detector where four simultaneous users under the multipath fading conditions. Moreover, this dissertation also presents the decorrelator to handle the received power being generated from inaccurate power control.|
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