Absfracf This paper considers Multi-Carrier CDMA (MCCDMA) communication systems. Recently, the asymptotic performance of a multiuser MMSE receiver for a MC-CDMA system has been established, assuming orthogonal spreading codes and equal powers. A similar study has also been conducted for a DS-CDMA system, considering in this ease unequal powers. The introduction of orthogonal codes can he consid...

Multi-carrier code division multiple access (MCCDMA) systems are under intense investigation for high bit rate wireless communication systems. Their equalization is based on the fast Fourier transform, allowing for an efficient implementation. Iterative receivers with joint detection and decoding have been shown to achieve very good performance for direct sequence (DS)-CDMA systems. We apply th...

The bit error rate (BER) performance of the asynchronous uplink channel of multicarrier code division multiple access (MCCDMA) systems with maximal ratio combining (MRC) is analyzed. The study takes into account the effects of channel path correlations in generalized frequency-selective fading channels. Closed-form BER expressions are developed for correlated Nakagami fading channels with arbit...

This paper studies the error performances of two different 4G downlinks in a multi-cell environment. On the one hand, an orthogonal frequency division multiplexing (OFDM) based multiple access scheme (OFDMA), and on the other hand, a multi-carrier code division multiple access (MC-CDMA) scheme is proposed. Both transmission schemes are implemented in a cellular structure. The cellular environme...

The aim of this paper is to contribute to study the problems of the blind identification and equalization using Higher Order Cumulants (HOC) in downlink Multi-Carrier Code Division Multiple Access (MCCDMA) systems. For this problem, two blind algorithms based on HOC for Broadband Radio Access Network (BRAN) channel are proposed. In the one hand, to assess the performance of these approaches to ...

Future mobile communication requires 100 Mbps data rate, video and audio streaming, asymmetric, multiple access, adaptive modulation and code rate, dynamic packet arrangement, adaptive antenna and IPv6 utilization facility to enhance lossless communication. We propose an Adaptive Modulation and Rate Coding Multi Carrier Code Division Multiple Access (AMRC-MC-CDMA) technique is a promising way t...

In this paper, we consider transmitter and receiver optimization in multicarrier code-division multiple-access (MCCDMA) systems under Rayleigh fading channels. Receiver optimization is performed in a decentralized manner, while transmitter optimization can be performed through either centralized or decentralized control of the powers of different carriers. Results show that when the number of u...

In this paper, we made a comprehensive study to evaluate the performance of a multi antenna supported multi carrier Code Division Multiple Access (MC-CDMA) system on color image transmission. The 2-by-2 spatially multiplexed 1⁄2-rated Convolutinally encoded MCCDMA system under investigation implements three linear signal detection techniques (Equalizers) such as Minimum Mean Square Error (MMSE)...

In this paper, we apply two different types of space-time block codes (STBC) in the downlink of a broadband mobile radio air interface based on MCCDMA, which is a promising candidate for a 4 generation mobile radio system. The first type are ”STBCs from orthogonal designs”. For 2 TX-antennas, this is the wellknown ”Alamouti”-scheme. These STBCs are compared to a different type, called cyclic de...

In multi-carrier code division multiple access (MCCDMA) uplink (mobile-to-base station), since different users’ signals go through different frequency-selective fading channels, large multi-access interference (MAI) is produced. The use of frequency-domain equalization reception can only partially restore the orthogonality among different users’ signals, resulting in a severe degradation in the...