An improved MUSIC algorithm for estimation of time delays in asynchronous DS-CDMA systems
نویسندگان
چکیده
This contribution is an asymptotic analysis of the algorithms proposed in [1]. The algorithms proposed in [1] treats the problem of time delay estimation in an asynchronous direct-sequence code-division multiple access (DS-CDMA) system in a near-far scenario.
منابع مشابه
Bit Error Performance for Asynchronous Ds Cdma Systems Over Multipath Rayleigh Fading Channels (RESEARCH NOTE)
In recent years, there has been considerable interest in the use of CDMA in mobile communications. Bit error rate is one of the most important parameters in the evaluation of CDMA systems. In this paper, we develop a technique to find an accurate approximation to the probability of bit error for asynchronous direct–sequence code division multiple–access (DS/CDMA) systems by modeling the multipl...
متن کاملOn-Line Propagation Delay Estimation in Asynchronous DS-CDMA Systems
In this paper, estimation and tracking of the propagation delays, also known as code acquisition and tracking, in an asynchronous DS-CDMA system are considered. Of special interest is the performance in a near-far environment and the proposed estimator is shown to be near-far resistant. The suggested technique is subspace based and relies on recursively tracking the signal subspace, followed by...
متن کاملChu and Mitra : Analysis of Music - Based Delay Estimators for Ds - Cdma
| Most receiver designs for asynchronous Direct-Sequence Code-Division Multiple-Access systems exploit timing information to simultaneously detect the desired signal and suppress the interference. In this paper, a previously proposed MUSIC delay estimation algorithm is considered which requires no initial information and no exhaustive search of the delays. Based on a Taylor series expansion, ap...
متن کاملJoint Parameter Estimation of Multiuser Asynchronous DS CDMA Signals in Unknown Fading Channel in DS CDMA System with Multiple Antennas at the Base-Station and Single Antenna at the Mobile
We present MUSIC type algorithm for joint parameter estimation in asynchronous DS CDMA system with multiple antenna system at base station and single antenna system at the mobile users. The proposed algorithm is applied in downlink processing and it enables the joint estimation of time delay, frequency shift as well as spatial parameters (direction of departure DOD of transmitted signal) of asy...
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 کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- IEEE Trans. Communications
دوره 47 شماره
صفحات -
تاریخ انتشار 1999