In this paper, we present a theoretical framework for code-aided synchronization and channel estimation for multi-carrier (MC) systems. Our endeavor is to exploit all available information from the received signal for the estimation of the unknown parameters. By means of the Expectation-Maximization (EM) formalism, we will show how soft information of the coded symbols computed by the detector ...

Orthogonal Frequency Division Multiplexing is a widely adopted multi carrier modulation in wireless communication systems due to its effective transmission and efficient bandwidth utilization ability. Wireless systems with coherent data detection require the estimation of channel at the receiver. Commonly employed pilot aided channel estimation probes the channel with known sequence called pilo...

In this paper, we present a theoretical framework for code-aided synchronization and channel estimation for multi-carrier (MC) systems. Our endeavor is to exploit all available information from the received signal for the estimation of the unknown parameters. By means of the Expectation-Maximization (EM) formalism, we will show how soft information of the coded symbols computed by the detector ...

For a few years, multicarrier modulations have been proposed as valuable alternatives with respect to state-of-the-art single carrier ones due to their resilience against interference and channel distortion effects. In particular, many studies are arising about multicarrier-CDMA (MC-CDMA) techniques that provide improved robustness and flexibility with respect to single-carrier spread-spectrum ...

A plethora of single-carrier and multi-carrier (MC) CDMA systems have been proposed recently to mitigate intersymbol interference (ISI) and eliminate multiuser interference (MUI). We present a unifying all-digital Generalized Multicarrier CDMA framework which enables us to describe existing CDMA schemes and to highlight thorny problems associated with them. To improve the bit error rate (BER) p...

A plethora of single-carrier and multi-carrier (MC) CDMA systems have been proposed recently to mitigate intersymbol interference (ISI) and eliminate multiuser interference (MUI). We present a unifying all-digital Generalized Multicarrier CDMA framework which enables us to describe existing CDMA schemes and to highlight thorny problems associated with them. To improve the bit error rate (BER) p...

This review paper is about the schemes of removing the inter carrier interference in the multiple input multiple output–orthogonal frequency division multiplexing system. The inter carrier interference occurs by the frequency offsets. In the cellular communication system the inter carrier interference arises due to the fully loaded traffic conditions at the cell edge .which is removed by the co...

High-data rate techniques in communication systems have gained considerable attraction in recent years. Strong candidates for these communication systems are Multiple Input Multiple Output (MIMO) systems, Orthogonal Frequency Division Multiplexing (OFDM) system and MIMO-OFDM systems. MIMO systems have shown their potential by improving the diversity gain with scheme as Space-Time Block Codes (S...

Space-time coding is a powerful way to leverage spatial diversity gain and improve reliability in multiple input multiple output (MIMO) communication systems. In this paper, we examine a semi-blind adaptive time-domain equalization (TEQ) strategy in conjunction with Alamouti space-time coding to achieve channel shortening. Channel shortening is necessary when the channel response is longer than...

Broadband Power Line Communications (PLC) have taken advantage of the research advances in multi-carrier modulations to mitigate frequency selective fading, and their adoption opens up a myriad of applications in the field of sensory and automation systems, multimedia connectivity or smart spaces. Nonetheless, the use of these multi-carrier modulations, such as Wavelet-OFDM, requires a highly a...