On Blind DS-CDMA Synchronization Using An Antenna Array
Andreas Jakobsson, Arnold Lee Swindlehurst, David Astély, Claes Tidestav · 1999
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 im...