In this article an efficient medium access control protocol with fair packet loss sharing packet scheduling is proposed for wireless code-division multiple access communications. The proposed MAC protocol exploits both time-division and code-division statistical multiplexing. The FPLS scheduler uses the information of traffic rate distribution and quality of service requirements to assign prior...

The performance comparison of the most feasible multiple access techniques proposed for fourth generation wireless communication systems, i.e., Orthogonal Frequency Division Multiplexing (OFDM) and Multi-Carrier Code Division Multiple Access (MC-CDMA) is evaluated. The objective is to find the most suitable technique for implementation in 4G Communication Systems. The modems of OFDM and MC-CDMA...

A full-diversity space-frequency block code (SFBC) for Single-Carrier Frequency-Division Multiple Access (SC-FDMA) systems is presented. The code is designed for 2 transmit antennas and preserves the low envelope fluctuations of SC signals. We prove the good performance of the proposed scheme over multiple-input multiple-output (MIMO) channels, both in static and in high-speed mobility scenarios.

Modern cellular mobile system work on either the time division multiple access (TDMA) or code-division multiple access (CDMA) principle. In CDMA system every user is assigned a unique signature sequence to spread his information bearing signal over the available channel bandwidth irrespective of the information bandwidth. The signature sequence consists of a number of chips which is proportiona...

In this contribution, we give an overview of the sensitivity of a number of multicarrier systems to carrier and symbol synchronization errors. A comparison is made between orthogonal frequency-division multiplexing/multiple access (OFDM(A)) and two combinations of the orthogonal multicarrier (MC) transmission technique with the code-division multiple access technique (CDMA), i.e. multicarrier C...

Abstract In this paper, new multiple access schemes based on the combination of Code Division Multiple Access (CDMA) and Multicarrier modulation (also known as OFDM (Orthogonal Frequency division Multiplexing)) are reviewed. Some of the main systems proposed to date are identified and the advantages of such systems discussed. A description of a simulation platform developed to analyse the perfo...

Orthogonal Frequency Division Multiplexing (OFDM) and Code Division Multiple Access (CDMA) are combined to benefit Multi-carrier (MC) Code Division Multiple Access (MC-CDMA) systems. High data rate wireless systems opt for these systems. A large amount of challenges still exist due to the random nature of wireless channels. In this paper, using the basic principles of MCCDMA technique, we emplo...

This paper presents the comparative performance of different detection and coding schemes for spectral-amplitude-coded optical code division multiple access (SACOCDMA) system. SAC-OCDMA systems are receiving more attention because of their ability to completely eliminate multiple access interference (MAI). Fiber Bragg grating (FBGs) are used as encoder/decoder. Experimental simulation was carri...

Recent advances in wireless communications have made use of MC-CDMA and OFDM techniques to allow for high data rate transmission. Rapid time variations of the wireless communication channel have a effect on the performance of multicarrier modulation. In this paper, we emphasis the Doppler spread and Computes its effect on the bit error rate (BER) for multicarrier code division multiple access (...