Recently, we proposed a differential space-code modulation (DSCM) scheme that integrates the strength of differential space-time coding and spreading to achieve interference suppression and resistance to time-varying channel fading in single-user environments. In this paper, we consider the problem of multiuser receiver design for code-division multiple-access (CDMA) systems that utilize DSCM f...

Quasi-coherent optical receivers have recently emerged targeting access networks, offering improved sensitivity and reach over direct-detection schemes at the expense of a higher receiver bandwidth. Higher levels system integration together with sufficiently wideband front-end blocks, in particular high-speed linear transimpedance amplifiers (TIAs), are currently demanded to reduce cost scale u...

-Modern wireless communication systems require advanced signal processing techniques to optimise the system resources with increased performance and capacity. In this paper, a chaotic sequence based Direct Sequence Code Division Multiple Access system with space-time receivers is proposed to accommodate more number of users in a limited bandwidth as compared to conventional Pseudo-Noise (PN) se...

Non linear effects play a major role in hindering the progress of optical communication systems in terms of higher data rates and long haul transmissions. Maximum Likelihood Sequence Detection (MLSD) has been proposed to combat the nonlinear effects in optical channels. The main objective is to extract the original signal from the received signal which is distorted due to the non linear effects...

We have discussed a simple method of MAI suppression in Chapter 6. The idea of MAI suppression stems form the single-user detection philosophy, in which we treat signals from other users as interference. In this chapter, we will introduce another way, namely multiuser detection, to tackle the near-far problem. In the paradigm of multiuser detection, we jointly detect data signals from all the u...

Conventional RAKE receiver is near-far limited. Linear minimum mean squared error (LMMSE) criterion can be used to obtain near-far resistant single-user receivers in direct-sequence code-division multiple-access (DS-CDMA) systems. Depending on the optimization criterion diierent adaptive receivers are obtained. In this paper, a novel adaptive LMMSE-RAKE receiver is presented, which combines con...