This work is aimed at investigating the use of neural network-based adaptive receivers for synchronous variable bit-rate Multi-Carrier CDMA systems transmitting over low-earth-orbit (LEO) satellite channels. It is known by literature that MC-CDMA techniques are much more resilient with respect to multi-user interference effects in multipath fading channels than single-carrier DS/CDMA ones. More...

This work is aimed at investigating the use of neural network-based adaptive receivers for synchronous variable bit-rate Multi-Carrier CDMA systems transmitting over low-earth-orbit (LEO) satellite channels. It is known by literature that MC-CDMA techniques are much more resilient with respect to multi-user interference effects in multipath fading channels than single-carrier DS/CDMA ones. More...

Spread spectrum multi-carrier multiple access (SS-MC-MA) systems exploit in a similar manner as MC-CDMA systems the advantages of the diversity gain due to the spread spectrum technique and the high bandwidth efficiency due to the orthogonal multi-carrier modulation. However, the main difference is that SS-MC-MA systems use FDMA for the user separation and therefore are less vulnerable to multi...

In this contribution, the benefit of applying channel knowledge at the transmitter is investigated for multi-carrier spread-spectrum (MC-SS) systems. Two different MC-SS systems are observed, namely uplink multi-carrier code-division multiple-access (MCCDMA) and spread-spectrum multi-carrier multiple-access (SSMC-MA). The latter system is considered for both downand uplink transmission. Pre-equ...

With the advancement and widespread implementation of multiple-input multiple-output (MIMO) wireless communication systems over last decade, space-time block coding (STBC) identification has become a critical task for intelligent radios. Previous examinations STBC were focused on single-user transmissions single-carrier multi-carrier in combination with uncoded broadcasts. Practical systems, ot...

In time-domain synchronous (TDS)-orthogonal frequency division multiplexing (OFDM) systems, a pseudo noise (PN) sequence is inserted instead of the cyclic prefix. The PN sequence is used not only as a guard interval but also as a training sequence for channel estimation and synchronization in the time domain. Recently, research studies on 2 × 1 multi input-single output (MISO) TDS-OFDM systems ...

One of the promising wireless access techniques for the next generation mobile communications systems is multi-carrier code division multiple access (MC-CDMA). MC-CDMA can provide good transmission performance owing to the frequency diversity effect in a severe frequency-selective fading channel. However, the bit error rate (BER) performance of coded MC-CDMA is inferior to that of orthogonal fr...

UFMC (Universal Filtered Multi-Carrier) is a novel multi-carrier transmission technique that aims to replace the OFDM (Orthogonal Frequency Division Multiplexing) modulation for fifth generation (5G) wireless communication systems. UFMC, being generalization of and FBMC (Filter Bank Multicarrier), combines advantages these systems at same time avoids their main disadvantages. Using Matlab simul...