Title :
Acquisition performance evaluation for fully digital receivers in a band-limited DS-SS CDMA system
Author_Institution :
ESA, ESTEC, Noordwijk, Netherlands
Abstract :
CDMA digital modems, utilising DS-SS, are currently being implemented for VSAT as well as for mobile and personal communications via satellite. A fundamental aspect for such terminals is the code synchronization and initial acquisition. The paper introduces an analytical formulation to evaluate the performance of the acquisition system in a fully digital modem. The analysis takes into account the presence of interchip interference due to band limitation, thermal noise, synchronous and asynchronous interferers. The analysis is then validated by extensive simulations. The system being considered is the BLQS-CDMA proposed by ESA, where all users are synchronous at chip level, but the analysis is applicable to any CDMA system. Comparisons with the classical analogue approach are made and easy to use models for a fast, accurate estimate of acquisition times are given.<>
Keywords :
code division multiple access; digital radio systems; modems; radio receivers; radiofrequency interference; satellite relay systems; spread spectrum communication; BLQS-CDMA; ESA; VSAT; acquisition performance evaluation; acquisition system; acquisition times; asynchronous interferers; bandlimited system; code synchronization; digital modems; digital receivers; initial acquisition; interchip interference; mobile communications; models; personal communications; synchronous interferers; thermal noise; Code division multiaccess; Digital radio; Electromagnetic radiative interference; Modems; Radio receivers; Satellite communication; Spread spectrum communication;
Conference_Titel :
Spread Spectrum Techniques for Radio Communication Systems, IEE Colloquium on
Conference_Location :
London, UK