High Performance Broadband DS-CDMA via Carrier Interferometry Chip Shaping

Conventional DS-CDMA systems employ a RAKE receiver in an attempt to make full use of the signal energy scattered in the time domain; however, the multipath effect causes a loss of orthogonality which degrades RAKE receiver performances. The literature on multi-carrier CDMA (MC-CDMA) has shown that receivers employing frequency diversity (in an effort to make full use of energy spread in the frequency domain) significantly outperform RAKE receivers [1]. To date, high-performance frequency-combining receivers have been unavailable to DS-CDMA systems.