Signal synchronization for direct‐sequence code‐division multiple access radio modems
Riccardo De Gaudenzi, Fllippo Glannetti, Marco Luise · European Transactions on Telecommunications · 1998
Abstract The design of low‐complexity, ‐size, and ‐cost modems for Code‐Division Multiple Access (CDMA) radio links like those envisaged in the 21st‐century Personal Communications Network puts forth challenging issues as far as signal detection for best power efficiency is concerned. As is often the case in modem design, the “ancillary” functions of signal synchronization may reveal fundamental in such an optimum design problem. Spread‐Spectrum CDMA signals reveal particularly demanding in this respect, so that the basic issues in carrier, code and chip/data timing should be carefully re‐considered before tackling light‐heartedly the design of a Digital Signal Processing (DSP)‐based CDMA modem. It is the aim of this paper to present an overview of those code acquisition/tracking and carrier frequency/phase recovery techniques for a Direct‐Sequence Spread‐Spectrum signal, that appear particularly suited to an efficient VLSI implementation.