Chip shaping and channel coding for CDMA

Chip shaping and channel coding for CDMA

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 fr...

Channel Coding and Power Control for FH/CDMA Radios

OF THE DISSERTATION Channel Coding and Power Control For FH/CDMA Radios by Victor Shiaw-Jong Lin Doctor of Philosophy in Electrical Engineering University of California, Los Angeles, 1995 Professor Gregory J. Pottie, Chair We investigate the issues of adaptive power control, channel code selection and decoding metrics formulation for a slow frequency-hopped/code division multiple access (SFH/CD...

Chip Level Decision Feedback Equalizer for CDMA Downlink Channel

In most commercial wideband code division multiple access (W-CDMA) systems, the transmitted signal in the downlink channel is spread by orthogonal codes to accommodate different users. However, frequency selective fading destroys the orthogonality and causes multiple access interference (MAI). The rake receiver has been proposed for a receiver in the downlink channel. Although providing reasona...

Iterative Receiver with EM Channel Estimation and CDMA Turbo Coding

1 In a conventional communication system with a turbo decoder, the received signal strength is measured at the receiver front end, but not the noise-power spectral density. Hence, the accuracy of the estimated bit energy-to-noise-spectral-density ratio can be poor, which degrades the turbo decoder. This paper presents an efficient iterative code-division multiple-access direct-sequence system t...