منابع مشابه
Multiuser Delay-Tracking CDMA Receiver
We propose to integrate delay tracking into a successive interference cancellation (SIC) code division multiple access (CDMA) multiuser detector. Delay-robust SIC was initially proposed for CDMAmultiuser detection when there exist time delay estimation errors. When the delay error is small, the true user signature vector can be approximately expanded around the estimated time delay as a linear ...
متن کاملNonlinear Multiuser Receiver for Optimized Chaos-Based DS-CDMA Systems
Chaos based communications have drawn increasing attention over the past years. Chaotic signals are derived from non-linear dynamic systems. They are aperiodic, broadband and deterministic signals that appear random in the time domain. Because of these properties, chaotic signals have been proposed to generate spreading sequences for wide-band secure communication recently. Like conventional DS...
متن کاملCDMA Multiuser Delay-Tracking and Detection
We propose a low complexity CDMA multiuser delay tracking receiver as an alternative to the more complex extended Kalman filter (EKF) based CDMA multiuser delay trackers. It integrates delay-tracking into CDMA multiuser detection by the delay-robust successive interference cancellation (SIC) technique, which was initially proposed for robust CDMA multiuser detection when there exists time delay...
متن کاملAdaptive Delay Tracking in Asynchronous Multiuser CDMA Systems
Published work on multiuser code division multiple access (CDMA) receivers often assume knowledge of most system parameters. But in a mobile system, it is unreasonable to assume perfect knowledge of the propagation delays for each mobile user at all times since these delays change when mobile units move. Therefore a method for tracking propagation delays in a practical asynchronous CDMA system ...
متن کاملTime Delay Tracking for Multiuser Synchronization in CDMA Networks
Multipath propagation, multiple access interference and non-line of sight propagation, etc. have impeded the accuracy in mobile data measurements. Multiuser receivers in asynchronous Code Division Multiple Access (CDMA) systems require the knowledge of several parameters such as timing delay between users. In this paper, the problem of time delay estimation for CDMA systems is examined by propo...
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ژورنال
عنوان ژورنال: EURASIP Journal on Advances in Signal Processing
سال: 2002
ISSN: 1687-6172,1687-6180
DOI: 10.1155/s1110865702209038