A Blind Frequency Domain Method for DS-CDMA Synchronization Using Antenna Arrays

A blind frequency domain method for estimating the propagation delays of DS-CDMA signals is presented. The algorithm is formulated using an antenna array, and uses the fact that the spatially and temporally correlated additive noise, consisting of both interfering users and thermal noise, will be asymptotically uncorrelated on the FFT frequency grid. The algorithm is computationally simple, and can be efficiently implemented using the FFT algorithm. Simulations illustrate that near-far resistance can be achieved using spatial diversity. 1

Burst Synchronization On Unknown Frequency Selective Channels With Co-Channel Interference Using An Antenna Array

In this work, burst oriented data transmission over unknown frequency selective channels is considered. The receiver is assumed to use multiple antennas and the problem of estimating the start position of a data packet in the presence of spatially correlated co-channel interference is addressed. Each burst is assumed to contain a known training sequence, and metrics for finding the position of this training sequence are studied. More specifically, we examine the advantages of taking the spatial correlation of the co-channel interference into account, as compared with treating it as spatially white. Simulations and experimental results for transmission of normal GSM bursts in interference limited scenarios are presented. I. INTRODUCTION To meet the increasing demands for higher data rates, quality, coverage and capacity of wireless systems, the use of antenna arrays has been proposed as a way to exploit the spatial dimension more efficiently [1]. Among the possibilities are improved r..

On Blind DS-CDMA Synchronization Using An Antenna Array

A blind frequency domain method for estimating the propagation delays of DS-CDMA signals is presented. The algorithm is formulated using an antenna array, and uses the fact that the spatially and temporally correlated additive noise, consisting of both interfering users and thermal noise, will be asymptotically uncorrelated on the FFT frequency grid. The algorithm is computationally simple, and can be efficiently implemented using the FFT algorithm. Simulations illustrate that near-far resistance can be achieved using spatial diversity. 1 Introduction Direct-sequence code division multiple access (DS-- CDMA) is widely considered to be a promising technology for future wireless communication networks. Due to the near-far problem for CDMA cellular systems in a multiuser environment, there has lately been an increased interest in robust time-delay estimation and blind adaptive interference suppression (see [3] and the many references therein). Near-far resistant estimators are of great ..

EU FP6 IST-2003-507581 WINNER, D2.6 Assessment of Multiple Access Technologies, Oct 2004.

The objective of this deliverable is to perform a first assessment of wireless access/multiple access technologies for the WINNER system concept. The study of multiple access schemes is the responsibility of Task 4 within the WINNER workpackage 2. The work requires the collection and assessment of the numerous ideas and proposals available. The technologies and combinations of technologies are also assessed and compared, to identify the most promising strategies and combinations. The latter work is primarily performed by multi-link simulation and system-level simulatio

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