In this paper we estimate the performance of 2*4 MIMO-MC-CDMA system using convolution code in MATLAB which highly reduces BER. MC-CDMA (Multi Carrier Code Division for Multiple Access) is a multi-user and multiple access system which is formed by the combination of OFDM and CDMA and convolution encoding scheme is used in encoder of CDMA as FEC (Forward Error Correction) code to reduce BER (Bit...

Orthogonal frequency division Multiplexing (OFDM) is one of the most popular multicarrier or multiplexing modulation techniques in high speed wireless communication. The main principle of OFDM system is to transmit multiple numbers of signals simultaneously over a single transmission path. OFDM convert high data rate stream in to smaller data rate stream. Due to this high data rate and ability ...

-Multiple input multiple output (MIMO) communication systems along with orthogonal frequency division multiplexing (OFDM) have a great potential for future 4G broadband wireless communications. Recently, low density parity check codes (LDPC) achieves good error correcting performance and capacity near Shannon’s limit. In this paper, we considered the performance analysis of serially concatenate...

In this letter, a novel supplementary index bit aided transmit diversity (SIB-TD) approach is proposed for an enhanced discrete cosine transform based orthogonal frequency division multiplexing with modulation (EDCT-OFDM-IM) system. Specifically, conventional (IM) employed the first antenna, i.e., main branch, and non-activated subcarriers’ indices in one group are utilized IM mapping on same s...

Single-carrier (SC) block transmission with cyclic prefix (CP) has several advantages that has been seen in this paper. The aim of this paper to improved the performance of SC-FDE multi-antenna SC-FDE by using cyclic-delay diversity (CDD) and Alamouti signaling. Analysis characterizes the diversity, it shows that diversity depends on the antenna configuration, channel memory, data block length ...

A Wireless Ad-hoc network is an autonomous and self-organizing network without any centralized controller. Cooperative communication is a technique used to increase the reliability and the quality of service (QoS), coverage area range. Space time coding and spatial diversity schemes enhances the performance of the wireless networks. Such networks can be used in military communications and have ...

A cognitive radio (CR) is a transceiver which automatically detects the available unused channels in the wireless spectrum. A cognitive radio network (CRN) is formed by either allowing the secondary users (SUs) to coexist with the primary users (PUs) or enabling the SUs to use the unoccupied portion of the spectrum. In this paper, the ergodic capacity maximization problem is studied in Rayleigh...

Whenever size, power or other constraints precluded the use of multiple transmit antennas, wireless systems cannot benefit from the well-known advantages of space time coding methods. Cooperation between wireless users has been proposed as a means to provide transmit diversity in the face of this limitation. This paper firstly analyse an ad-hoc network with a sender, a destination and a third s...

This paper explores the role of multiple antennas in mitigating jamming attacks for Rayleigh fading environment with exogenous random traffic arrival. The jammer is assumed to have energy harvesting ability where arrives according Bernoulli process. outage probabilities are derived different assumptions on number at transmitter and receiver. probability Alamouti space-time code also derived. wo...

In broadband downlink transmission, orthogonal frequency-division multiplexing (OFDM) combined with code-division multiple access (CDMA) is a prospective technique for high-data rate transmission in future wireless communication systems. By adding spatial diversity, multiple-input and multiple-output orthogonal frequency and code division multiplexing (MIMO-OFCDM) offers superior performance re...