Codeword optimization for uplink CDMA dispersive channels

Codeword Optimization for Asynchronous CDMA Systems Through Interference Avoidance

The paper investigates application of interference avoidance to asynchronous CDMA systems for which symbol intervals corresponding to different users may not be necessarily synchronized at the receiver. The asynchronous system is modeled as framesynchronous with symbols sent in parallel using a multicode CDMA approach. Each symbol in the frame is transmitted using a distinct signature waveform ...

CDMA Codeword optimization: Interference avoidance and convergence via class warfare

Blind equalization and multiuser detection in dispersive CDMA channels

The problem of blind demodulation of multiuser information symbols in a high-rate code-division multiple-access (CDMA) network in the presence of both multiple-access interference (MAI) and intersymbol interference (ISI) is considered. The dispersive CDMA channel is first cast into a multipleinput multiple-output (MIMO) signal model framework. By applying the theory of blind MIMO channel identi...

Synchronous Mc - Cdma in Dispersive , Mobile Rayleigh Channels

Time variations of the mobile radio channel cause InterCarrier Interference (ICI) to Orthogonal Frequency Division Multiplexing (OFDM) and Multi-Carrier CDMA (MCCDMA) radio links. This paper evaluates the effect of Doppler and delay spreads on the performance of an MC-CDMA receiver. An MMSE receiver is analyzed for MC-CDMA transmission over a mobile channel with Doppler. A simplified, pseudo MM...

Comparative Performance of Different Adaptive Cdma Forms on Dispersive Channels

Spread spectrum techniques have been used for many cellular communication systems, and are being adopted widely for military communication networks. The motivation for employing this technique is its ability to suppress fading due to multipath propagation. In this paper, receivers based on chip level equalization are considered for a downlink code division multiple access (CDMA) system employin...