 There have been various receiver-based techniques for performance improvement of wireless communications systems. However, receiver-based techniques have a restricted application in the down-link because they increase computational complexity of the mobile station (MS). In this paper, a transmitter-based processing scheme for the down-link direct-sequence code division multiple access (DS/CDM...

Independent Components Analysis nds a linear transformation to variables which are maximally statistically independent. We examine ICA and algorithms for nding the best transformation from the point of view of maximising the likelihood of the data. In particular, examine the way in which scaling of the unmixing matrix permits a \static" nonlinearity to adapt to various margninal densities. We d...

Recently, sequences generated by nonlinear dynamical systems have been considered in CDMA spread spectrum application and it has been shown that they can behave better than classical ones. In almost all cases, classical criterium have been considered to design good spreading sequences, they are based on periodic or aperiodic correlation functions, like Figure Of Merit or Maximal Correlation Pic...

In this paper a blind, adaptive multiuser receiver for CDMA channels with integrated channel estimation is considered. The proposed receiver requires only the signature code of the user of interest (UOI) and does not require any training sequences, the channel parameters and signature codes of the interfering users. In a dynamic channel scenario, the tracking of the channel is done adaptively w...

MIMO is a technique to increase data rate significantly with multiple antennas at both the transmitter and receiver. MIMO takes the advantage of random fading and multipath delay spread. MIMO systems will need to function reliably in interference limited environment in order to be effective. CDMA systems are designed to operate in an interference free environment and for this reason it is used ...

The performance of linear interference suppression in a DS-CDMA (Direct-Sequence Code Division Multiple Access) system using random codes varies over the user population due to the random set of interfering sequences. As a result , the capacity of such systems depends on the distribution of the interfering signature sequences and consequently the distribution of the signal-to-interference ratio...

An analytical framework for noncoherent decision feedback detection is introduced while considering nonorthogonal binary modulation (NBM) over the synchronous Gaussian K-user channel. Following the key idea of noncoherent decorrelating decision feedback detection (NC-DDFD) proposed in [1], a K-parameter class of NC-DDFDs is defined. The symmetric energy measure is defined as the worst-case (ove...