MC-CDMA and OFDM systems are widely used in the existing 3rd and 4th generation wireless networks. They are also good candidates for the future generation networks for broadband and personal communications. But, high peak to average power ratios (PAPR) is serious problem in MCCDMA which can increase complexity in the analog to digital and digital to analog converter, reduce the system efficienc...

Abstract MC-CDMA, a multicarrier modulation scheme based on code division multiple access (CDMA) is the most likely candidate for the next generation of mobile radio communications. Rate compatible punctured turbo coded hybrid ARQ (RCPT HARQ) has been found to give improved throughput performance in a DS-CDMA system. In this paper, we apply RCPT HARQ to an MC-CDMA system and evaluate by compute...

Multi-carrier code division multiple access (MC-CDMA) is an attractive multiple access technique. For achieving a very high speed data transmission with a limited bandwidth, MCCDMA can be jointly used with multiple-input multipleoutput (MIMO) multiplexing. Among many signal detection methods, an iterative interference cancellation technique can be used. The presence of residual interference lim...

The use of frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can significantly improve the downlink bit error rate (BER) performances of DSand MCCDMA in a frequency-selective fading channel. However, the uplink BER performance degrades due to a strong multi-user interference (MUI). In this paper, we propose frequency-interleaved spread spectrum (SS) using M...

The paper considers downlink space-time block coding with a pre-filtering technique for time division duplex MCCDMA. We consider the use of antenna arrays at the base station (BS) and a single antenna at the mobile terminal. The space-time block codes allow that the spatial diversity be efficiently exploited and the multi-user pre-filtering technique allows to format the transmitted signals so ...

This paper propose two advanced space-frequency schemes with a pre-filtering technique for downlink time division duplex (TDD) MC-CDMA system. We consider the use of antenna arrays at the base station (BS) and a single antenna at the mobile terminal (MT). We derive a multi-user pre-filtering technique that allows to format the transmitted signals so that the multiple access interference at mobi...

We propose a downlink multiple-input multiple-output multi-carrier code division multiple access system with adaptive beamforming algorithm for smart antennas. The algorithm used in this paper is based on the least mean square, with pilot channel estimation and the zero forcing equalizer in the receiver, requiring reference signal and no knowledge channel. multi-carrier code division multiple a...

OFDM and MC-CDMA are multicarrier modulation schemes that have been proposed for 4G systems due to their ability to achieve high spectral e¢ ciency by using minimally spaced orthogonal subcarriers and provide robustness against frequency selectivity in wireless channels, without increasing the transceiver complexity. Arrayed-MIMO systems, which employ antenna arrays at both ends of the wireless...